The car has great acceleration but on the highway the low gearing is a problem. Engines and the ratios were 2361 1781 1411 and 11. Gear Ratio and Tire Size Chart. The last Ford 9-inch rear to be installed in a passenger car was 1980. item 1 Ford 9" Inch Mustang Falcon Rearend 3.89 Ring and Pinion Nitro 3.90 Gear Set 1 - Ford 9" Inch Mustang Falcon Rearend 3.89 Ring and Pinion Nitro 3.90 Gear Set $120.00 Free shipping The 12-bolt / 9 inch drop-out caseis The 12-bolt pinion is closer to the the center of the ring gear, in comparison to a 9” gear, making the 12-bolt 3% more efficient than a 9” rear ( 9” pinion is 2.250” below the center of the ring gear; compared to a 1.50” drop for12-bolt). $189.00. 1973-1979 Ford Truck Rear Axle Codes. IDEAL CONTACT Pattern is spread evenly over tooth's profile with concentration nearer toe than heel. . Many custom made axle housings for the GM boys utilize the 9 inch Ford, even though they hate to admit it. The BOM will identify the model number, the gear ratio, the type of differential, and all component parts. This gear ratio and tire diameter chart is meant to give you an approximation of ideal RPMs at highway speed (65 mph) for three situations: fuel economy, every day driving and increased towing power. Available In Ratios From 3.00 Thru 6.50. * Pro Gears are specifically designed for drag race only. Description. It was not the only axle used, but was by far one of the best. See all 33 photos This is a typical fully-assembled Ford 9-inch third-member. 3.40 Ratio PRO Gear Differential Ring and Pinion for 9 (Inch) (Dropout) Manufactured by Richmond Gear. The Final Drive Ratio shows you how many times the engine turns for one complete turn of the tires. CLICK FOR MORE INFO. A complete Currie 9-inch third member makes it easy to update your street rod, muscle car, or truck with a new gear ratio or performance differential. The Function of Ford 9 Inch Gear Ratios Chart Ford is prominent manufacturer in car industry. The chart below may be of some help in deciding what rear end ratio is right for you. Ford Pass '63: 3.00: 9 in: NL4-1/2 in Ring Gear Bolts: WCN-B: Ford Pass '63-64: 3.50: 9 in: NL4-1/2 in Ring Gear Bolts: WCN-C: Ford Pass '63-64: 4.11: 9 in: NL4-1/2 in Ring Gear Bolts: WCN-D: Ford Pass '63: 3.00: 8 3/4 in: NL--WCN-E: Ford Pass '63-64: 3.50: 8 3/4 in: NL--WCN-G: Ford Pass '63: 4.11: 8 3/4 in: NL--WCN-H: Ford Pass '63: 3.89: 8 3/4 in: NL--WCN-J The axle was developed to replace the Ford 9-inch axle.This axle is still in production today for a variety of Ford vehicles. Axle: Ford 9 Inch. Strange Engineering offers many options for Ford 9 gear sets. The 9 inch Ford performance rear end has established itself as the gold standard for strength and durability. The 9 inch rear has become pervasive in the performance market that Strange has helped build for over 50 years. CLICK HERE to see a complete listing of front axle codes). As you know, this ratio is useful to accommodate repairing and maintenance. In order to hold the differential case in place while you torque … Warranty Period: 2 Years or 100,000 Miles. 3" O.D. Ford 9 Inch Rebuild/Gear Setup By admin - August 2, 2004 By James Oxley. Differential Gear Ratio. 00. If measuring the drum-to-drum distance, add .200-inch to these values. Ford used the axle from around the 1957 model year right up until the early 1980’s in cars and trucks. With an overdrive transmission your … MADE IN THE USA! The heat treated aluminum alloy well suited to absorb high impact shock loads. The rear-axle ratio was 3.50:1 with three- or four-speed manuals and 352- and 390-inch V-8s. 275 is the WIDTH of the tire tread in millimeters, 75 is the ASPECT (or percentage of tread width to yield the sidewall height), and 16 is the WHEEL diameter. .chrysler® 9.25" 9.5. . The 1310 series is commonly known as the "small" u-joint and the 1330 series is known as the "large" u-joint. . .ford® 9.75” 10. . . Another strength consideration is … Metric tire specifications follow a three number format, for example: 275/75R16. used set of a different ratio, inspect the back face of the ring gear for flat-ness. At 60 miles per hour the motor is revving about 3,000 RPM - way too high. Winters Performance offers an extremely durable gear chart for 10 spline quick change, 6 spline quick change, 7” quick change and xtremeliner quick change gears to help you determine the correct final drive ratio for your car at the track or in the shop. 1973-1979 Ford Truck Rear Axle Codes. Save wishlist. JEGS 28035 - Black RTV Temperature Resistant up to 625 Degrees F Part Numbers. CLICK HERE to see a complete listing of front axle codes). Part Number: SPZ-36135 Not Yet Reviewed Only 5 left in stock - order soon. In the quest for better elapsed times from our S-10 race truck, we decided to swap the 4.33 ratio ring and pinion in the truck's 9-inch Ford axle for a set of 4.56 gears. Pinion Shaft Diameter 1.313 (Inch) Pinion Spline Count 28. The 9-inch came in Ford cars and trucks and can be found in many configurations, lug patterns, and widths; junkyard versions are becoming more difficult to find. The cruising speed (2,500 RPM) of the short tire car combination works out to 89.346 MPH while the tall tire combo cruises at 106.94 (!) In most applications the driver's side should be 4 inches shorter than the passenger side axle for a 9-inch rearend. Exclusive 9" Gear Ratios. It is controlled by the number of teeth on the ring vs. the pinion. The chart consists of several columns that represents ratio, ring teeth, common factor, and pinion teeth. Identify Your Ford Truck Axle From The Door Sticker. GM F body 67-69 Complete 9" Rearend. How to re-gear a Ford 9 inch differential. Ford 9" / Ring & Pinion Gear Set / 5.50 Ratio. Ring Gear Material: 8620 Steel. Edited for Adsense approval First thing to understand in Ford 9 inch gear ratios chart is related to gear ratio. To keep the jump between 3rd and 4th in the 15% or less range it would be nice to put in a rear with the 2.14 or 2.28 ratio. A late 50's F-100 rear end ( a Ford 9 inch ) is almost a direct bolt in for a 50 Ford pickup. 09F457P. Metric tire specifications follow a three number format, for example: 275/75R16. Diff gear ratio is 3:8-1. Unless driven gears with more than 45 teeth and / or drive gears with fewer than 15 teeth become available, it will be impossible without using a ratio adapter to have an accurate speedometer with rear end gear ratios lower (higher numerically) than 4.10:1, unless 27 inch or larger tires are installed. . View Comparison Chart… will have a slower acceleration. Ring Gear Diameter: 9 (Inch) Ring Gear … 9 Inch Ford rear differential. A ratio of 4.56 means that as the axle turns one whole circle the driveshaft turns 4.56 circles. . Step 3 Locate the VIN tag on the rear face of the driver-side door---the primary identification tag for the vehicle. Add To Cart Add to Wish List. Motive Gear and Motive Gear Performance ring gear and pinions are developed to be run at .008" to .012" back-lash for street gear sets. This particular 4x4 had a 350hp V-8, a TH350 auto tranny, a Dana 300 T-case with the stock 2.62:1 low range, Dana 44 and Ford 9-inch axles with 5.13 axle gears, and 38-inch tires. Products (Total Items: 8) Price: Low to High Price: High to Low Name Newest Avg Review Review Count Free Shipping On Sale. All Currie built-to-order third members feature a new gear case, bearings, seals, solid pinion bearing spacer, Daytona pinion support, with a choice of gear ratio, pinion yoke, and differential type. Micro Polished / Isotropic Finish / REM. The narrowest production 9-inch axle is 56.375 inches. It features the legendary Ford 9-inch ring and pinion strength, 5-on-5.5 lug pattern (same as older Jeep), a 65-inch width at the wheel mounting surfaces, large-bearing semi-floating axles, and many can be found with hefty 31-spline axleshafts. Listed are the expected RPM's at 60 MPH with a given rear end ratio and tire height. 8620 Alloy First Run Steel. Once the pinion gear is installed, position ring gear and carrier into housing to check backlash. COMPETITION CONTACT Pattern concentrated just up from the toe covering 1/3 to 1/2 of the tooth. . The 9&Quot; Ford Rear Is A Model Of Simplicity For Adjustment Of Pinion Depth And Setting Backlash . The 9” Ford rear axle, so called because of a 9” ring gear diameter, is the choice of many circle track racers because of its strength, availability and ease of maintenance. Cover Bolt Quantity Dropout. 9" Ford Trac-Lock Posi 31 - Gear - Bearing Kit Package - 4.11 Ratio - 9 Inch NEW If you have ford car, Ford 9 inch gear ratios chart is useful to inspect what gear your car uses. . Description: US Gear Ring and Pinion # 07-890370SS | Ford 9" | 3.70 Ratio. .ford® & gm® 10.5” 11.5. . The Gear Ratio at which Carrier Breaks occur varies, depending on the type of differential. . The gear ratio most interesting to 4x4 truck owners is the ratio between the driveshaft and axles - the differential gear ratio or axle gear ratio. 5. The last Ford 9-inch rear end to be installed in a truck was at the end of 1985, which concluded all (factory) production of the Ford 9-inch rear. Common 9" Ford axle widths. Gears: All. 9CP325. The first two digits of the axle code identify the ratio and capacity of the rear axle. Learn more about the superior design and benefits of our fabricated Ford 9 inch rearend axle housing kit. Shafts: 28/31 Spline. One of the primary reasons why the 9" Ford rear end has come to dominate drag racing is the ease with which thirdmembers with various ring & pinion gear ratios can be installed. The aftermarket has responded to this by offering a plethora of ratios ranging from 2.91 to 6.50:1. “Pro” gears are designed specifically for drag racing. Whether you call it a Hogs head, drop out, chunk, or 3rd member, Dutchman has you covered with several levels of 9 inch Ford 3rd member options, structured to meet the needs of your street machine or race car build. Ford changed the layout of the tags sometime in the early 70's or late 60's, here is a WFE-BK2 tag, followed by a date code of 4E24 (April 24,1974), the second line now gives besides the ratio-here a 3L50, the ring gear actually used inside-this one is a true 9" gear.This tag is off a 74 Ford truck. Once preload is set install the seal and loctite pinion nut. East Coast Gear Supply in Durham/Raleigh NC for online racing, performance, off-road & 4x4 parts, sales & service. The Maverick rear is a good choice for the 50 car. The bigger advantages of the 9" over the 8.8 is more aftermarket support for gear ratios, availability of larger aftermarket shafts, back braces, etc. Race Only Strange Pro Nodular Iron. This chart applies to all Ford non-overdirve transmissions manual and automatic. I wonder what a good gear ratio would be - the motor is good for about 250 HP. Ships QTY . Ring Gear Diameter Ratio STEALTH Series LIGHTNING Finish 01 – GM 8 – 8620 80 = 8.0 inches 342 = 3.42:1 SS Most advanced gear cutting option ISF Super finished gear option 03 – Chrysler (Mopar) 4 – 4320 84 = 8.4 inches 373 = 3.73:1 05 – Dana 9 – 9310 87 = 8.75 inches 389 = 3.89:1 07 – Ford 88 = 8.875 inches 410 = 4.10:1 Both of these can be found on the Ford 9 inch rears. Description: US Gear Ring and Pinion # 07-990457 | Ford 9" PRO Big Pinion | 4.57 Ratio. This chart is based on 65 MPH and a gear ratio of 1:1, on a manual transmission in 4th gear. The following chart of Tire sizes and axle gear ratios are meant to give a general idea of the relationship between the differential gear ratio and the tire size and what effect the ratio has on power output and fuel economy. An assortment of Ford 9-inch axle stampings is welded together to create the housing. .ford® 9" 9. . FREE Shipping. The cast-iron third member is installed from the front of the housing. $141.99 Add To Cart. This Final Drive number is also your torque multiplier when in that gear. Add To Cart. 12. SAME DAY SHIPPING (if ordered before 2pm EST) Lightning™ Series is an option that can be selected below, This option can increase the shipping time by up to two weeks! 1990-2011 Ford Ranger (58.50-Inch WMS to WMS) Add To Cart. For a Ford 9 inch rear end, swapping gears is fairly easy as it has a removable third member. Model: SL F9-28-31. GM Tri 5 55-57 Chevy Complete 9" Rearend. All Currie built-to-order third members feature a new gear case, bearings, seals, solid pinion bearing spacer, Daytona pinion support, with a choice of gear ratio, pinion yoke, and differential type. Ford changed the layout of the tags sometime in the early 70’s or late 60’s, here is a WFE-BK2 tag, followed by a date code of 4E24 (April 24,1974), the second line now gives besides the ratio-here a 3L50, the ring gear actually used inside-this one is a true 9″ gear.This tag is off a 74 Ford truck. All 31-Spline Axle Shafts Except 1990-2011 Ford Ranger (FX4 Models Were 31-Spline) Applications: 1984-1996 Ford Bronco. A Ford 9-inch has a ring-gear diameter of, you guessed it, 9 inches closely followed by the 12-bolt at 8.875, with the Mustang rear at 8.80 inches. Base engine-equipped cars with Ford-O-matics used a 3.25:1 ratio, and with a Cruise-O-Matic, ratios ranged from 3.25:1 to 3.00:1. There is a gear ratio stamped on the tag. . West Coast notes Then most any 9 inch center section can be installed to get the gear ratio you want very easily. allow larger ring gear to fit. It allows you to do gear swaps on the work bench instead of under the vehicle--much easier on your back. It’s called a 9 inch because the ring gear measures 9 inches. Ford changed the layout of the tags sometime in the early 70’s or late 60’s, here is a WFE-BK2 tag, followed by a date code of 4E24 (April 24,1974), the second line now gives besides the ratio-here a 3L50, the ring gear actually used inside-this one is a true 9″ gear.This tag is off a 74 Ford truck. Part #: 79-0001-1. One of the primary reasons why the 9" Ford rear end has come to dominate drag racing is the ease with which thirdmembers with various ring & pinion gear ratios can be installed. STEALTH® Series. Standard Ford 9 inch gear sets are primarily used in street applications. Free shipping. . Revolution Gear and Axle Ford 9 Inch Ring and Pinion Gear sets are made from the highest quality steel and are precision heat treated to OEM specifications, making for the best aftermarket gears available. For our example, we’ll use a common 700R4. Wholesale discount prices on Ford 9" gears, install kits, carriers, spider gears for your Ford 9" diff off-road truck/4X4 vehicle? FORD FINAL DRIVE RATIOS Find your transmission and rear gear multiplier below. Given the final axle ratio of 3.08:1 in each car, the overall ratio drops to 2.156:1. 9-Inch Standard Ring And Pinion Gear Sets (3.00 to 6.50 Ratios) $240.00. Hooley's Stude has had a 2.47 nine inch Ford rearend and runs a G-Force 101A transmission that lets him run an overdrive 3rd gear as 4th gear with the old 4th (1 to 1) now 3rd. Drive side of gear. GM X-Body Nova 66-67 Complete 9" Rear End. 1967 Fairlane 63.50 inches coil springs 1972 Ford Van 3/4 ton 68 inches 1973-1986 Ford Van 3/4 ton 65.25 inches 1957-1959 Ranchero and station wagon 57.25 inches narrowest 9" housing 1966-1977 Bronco 58 inches 5-on-5 1/2 inch diameter bolt circle 1967-1973 Torinos, Rancheros, Fairlanes 59.25 inches or 61.25 inches Besides producing car, Ford also creates its own gear. This gear ratio and tire diameter chart is meant to give you an approximation of ideal RPMs at highway speed (65 mph) for three situations: fuel economy, every day driving and increased towing power. 9 Inch Ford REM Polished Gears - 9" Ford Ring & Pinion - 4.30 Ratio - NEW. lash to open up. (The third digit of the axle code identifies the ratio and/or capacity of the front axle, if applicable. Note: If You Are A Beginner, This Is The Rear You Want To Start With. The 9” Ford rear axle, so called because of a 9” ring gear diameter, is the choice of many circle track racers because of its strength, availability and ease of maintenance. STEALTH® Series. A complete Currie 9-inch third member makes it easy to update your street rod, muscle car, or truck with a new gear ratio or performance differential. All Revolution Ring and Pinion sets are backed by an industry leading 2 Year Warranty against defects. SVT Cobra Mustangs and Shelbys offer ideas for potential upgrades. For example: The tag will say: 350 for 3.50:1 ring and pinion gear ratio. JEGS 60005 - Ford 9" Ring & Pinion 4.56 Ratio. ring gears use a pilot bearing that ... Toe Illustration courtesy Richmond Gear Performance.indd 2 9/23/15 2:43 PM. . MADE IN THE USA! . Re: Highest gear ratio for Ford 9 inch ? First thing to understand in Ford 9 inch gear ratios chart is related to gear ratio. This gear is commonly called as axle used solid configuration that changes from pinion teeth into center. This is revolutionary technology because the car can accelerate faster. $125. The Ford 9 inch has found its way into just about every brand of high performance vehicle on the road or track today. The aftermarket has responded to this by offering a plethora of ratios ranging from 2.91 to 6.50:1. 4. An EquaLock limited-slip differential was optional, and the 9-inch Ford rear end is a highly regarded, tough unit. For example, if you have a Dana 44 axle with a gear ratio of 3.73 and want to install a 3.92 or numerically higher gear set, you will need a different carrier. Ford used the axle from around the 1957 model year right up until the early 1980’s in cars and trucks. There’s no question, the easiest way to identify the axle and gear ratio in your truck is from the door sticker. Items You Need. This chart provides values that represent a 1:1 ratio … 9 inch ID tag numbers: ID tag: Ratio: Ring Gear Diameter (in) ID tag: Ratio: Ring Gear Diameter (in) WDM-AH: 3.25:1: 9 : WCZ-S: 3.50:1: 9 : WCZ-T: 3.50:1: 9: WDC-DW: 2.75:1: 9 : WDC-EB: 2.75:1: 9: WDC-EE: 3.00:1: 9 : WDC-EH: 2.75:1: 9: WDC-EK: 3.00:1: 9 : WDC-EL: 2.50:1: 9: WDC-EM: 2.50:1: 9 : WDX-E: 2.75:1: 9: WCZ-H: 3.89:1: 9 : WCZ-J: 4.11:1: 9: WCZ-P: 3.50:1: 9 : WCZ-R: 3.89:1: 9: WFU-E: 4.30:1: 9 : WEB-BF: 2.50:1: 9: WEB-BK: 3.00:1: 9 : WEB-BM: 2.75:1: 9: WES-F ECGS offers Precision Gear, Yukon, Pro Gear, Lockright, ARB performance parts & accessories for Ford 9 inch differential 4x4, off-road & other vehicles. Part Number: NGA-F10-537-NG Not Yet Reviewed Au$399.00. A slight taper may have occurred ... Differentials notes that Ford 8- and 9-in., and GM 10.5- and 12.25-in. This means the supply of Ford-produced 9-inch rear ends, from the wrecking yards, has been drying up for 28 years now. This Spartan Locker fits Ford 9 Inch axles with 28 or 31 spline axle shafts. June 3, 2018 0. ... sporting a 9 3/8-inch ring gear, don't be surprised. A lower gear ratio (2.73, 3.08, etc.) Gear Ratio and Tire Size Chart. Installation. Add to comparison. Ring & Pinion Gears for Ford 9" - 4.56 Ratio. . Ford F-150 9-Inch Axles: The Ford 9-inch can be found under 1974-1986 F-150s and 1978-1986 Broncos. (Ford 8.8-Inch Rear Axle) Specifications: 8.8-Inch Ring Gear. Higher gears are sometimes referred to … Question about the product. Determining actual Tire Diameter or “Height” is the first step to using the RPM calculator to find the best gear ratio. Ring Gear Bolt Quantity 10. In reality, strength wise in stock form, the 8.8 and the 9" are really the same. . Traditional BOM’s are 6 digits followed by 1 or 2 digits and start with the numbers 60 or 61. Differential Case Design Type Ford 9. Ring Gear Diameter 9 (Inch) Ring Gear Material 8620 Steel. To recognize a Locking 9" differential, look for a metal tag on one of the bolts that holds the center section to the housing. Quick Links /// Xtremeliner /// 10-Spline /// 6-Spline /// 7-Inch We've Got You Covered! Richmond Gear EXCel F9350 9" Ford Ring & Pinion, 3.50 Gear Ratio Ford 9 Inch, Grand National, 3.50:1 Ratio, 35 Ring Tooth Count, 10 Pinion Tooth Count 5 Reviews | 4 Answered Questions Here is an example tag of a 9 inch that isn't quite up to the full measure,it is a 3.50 ratio, but followed by that are the numbers 8.7 which denote that this carrier is sporting a ring gear of an actual 8 3/4 inch diameter.This one is off a 1970 Bronco, built 3rd week of April 1970.This would have been a 28 spline unit when checked in manual. 0 Review (s) Your Price: $275.00. (The third digit of the axle code identifies the ratio and/or capacity of the front axle, if applicable. With its 2.250-inch offset, the Ford 9 inch gears hypoid distance is greater than popular competitors, most of which are at 1.5 inches or even less. Heat Treated for … #2 • Nov 1, 2012. 65-66 Mustang 57.25 inches; 67-70 Mustang 59.25 inches ; 71-73 Mustang 61.25 inches ; 77-81 Versailles 58.50 inches ; 74 Maverick 8" 56.50 inches ; 75 Mustang II 8" 57.00 inches ; 67-73 Mustang, Torino, Ranchero, Fairlane 9" 59.25 inches to 61.25 inches; 57-59 Ranchero and Wagon 57.25 inches (narrowest 9" housing) If you open the drivers door and look at the door jamb, you’ll see a sticker like the one shown below: You’ll see that the area labeled (F) is … In its stock configuration, you should easily be able to transplant an 8-inch into any mid-size muscle car that has an engine rated at 300hp or below. The Ford 9-inch is the most desirable drag racing rear end because it has a removable carrier, which … * Pro Gears are specifically designed for drag race only. Determining actual Tire Diameter or “Height” is the first step to using the RPM calculator to find the best gear ratio. But lower rear gear ratios allow for higher top speeds and better fuel economy. MADE IN THE USA! Specs. It was not the only axle used, but was by far one of the best. The next section will explore several aspects related to this topic. I have used a 57 to 59 Ford car rear end under a 50 Ford. 9. . Brand New. Ford 9 inch Third Member. Ford 9" 3.00 Part# 07-890300 Lightning# 07-890300ISF Ford 9" 3.00 Lightning Series Part# 07-890300ISF Ford 9" 3.25 Part# 07-890325 Lightning# 07-890325ISF Ford 9" 3.25 Lightning Series Part# 07-890325ISF Ford 9" 3.25 STEALTH Part# 07-890325SS Lightning# 07-890325SSISF Ford 9" 3.25 STEALTH Lightning Series Part# 07-890325SSISF Ford 9" 3.40 Part# 07-890340 Lightning# 07-890340ISF Ford 9" 3.40 Lightning Series Part# 07-890340ISF Ford 9… 427s use dual 4-port extended runners from each port converging to a rear outlet. .gm® 9 bolt 9.25. . axle tubes with 3/16" wall thickness Billet steel "New Big Ford" (Torino) style bearing ends Forged Currie Enterprises 1541 Steel axles, dual drilled for both 5 on 4-1/2" Ford/Mopar and 5 on 4-3/4" GM wheel bolt patterns. Many custom made axle housings for the GM boys utilize the 9 inch Ford, even though they hate to admit it. Power is transmitted from the transmission to rear end 1:1 in high gear. 2,387 Posts. Ring & Pinion Gear Ratio 5.14. Gear Size: 9". . The beauty of the 9-inch is the removable gear carrier. The material and heat treating provide excellent wear service life, but doesn’t handle shock loads as well as Pro 9 in gears. .ford®10.25” 10.5. . Details: Motive Gear ® Performance Gear Sets. Great Choice For Street, Strip And Off-Road Applications. High gear on a 700R4 is 0.70:1. Most 9" rear differentials will be the open type. See more product details. Part Number: 555-60005. Post by jeff swisher » Fri Mar 18, 2011 2:42 am the answer i have is 2.29 to 1..from a mid to late 70's ford car with a 351m and a c6..i think 10-Bolt Rear Cover. Ring and Pinion Gear, Ford 10 Inch 5.37 Ratio 9310 Pro Ring And Pinion. . .gm® 11.5” … Many vehicles have been produced. The 9-inch Ford outperforms the GM 12-bolt rearend by a wide margin. Pinion Spline Count: 28. Original ratio … Step-9: Set Differential in Spline Tool. SAME DAY SHIPPING (if ordered before 2pm EST) Lightning™ Series is an option that can be selected below, This option can increase the shipping time by up to two weeks! The code chart tells the gear ratio and ring-gear size, denoting an 8- or 9-inch rear end. Please NOTE: If you have an automatic transmission your RPM will higher due to slippage in the transmission and the torque converter. Ford Mustang 67-70 Complete 9" Rearend. SAME DAY SHIPPING (if ordered before 2pm EST) Lightning™ Series is an option that can be selected below, This option can increase the shipping time by up to two weeks! Description: US Gear Ring and Pinion # 07-890370SS | Ford 9" | 3.70 Ratio. The first two digits of the axle code identify the ratio and capacity of the rear axle. Add To Cart. The Ford 9-inch is a great swap candidate for those looking for more axle beef. HIGH CONTACT Pattern is concentrated at the crown of the drive gear tooth. ... Only one gear ratio … GM Chevy S10 Complete 9" Rearend. Excel Ring & Pinion Gear Set Ford 9" Ratio: 4.56; Teeth: 41-9.