Make sure to select the appropriate Light Duty or Heavy Duty section of The Expert. Need help identifying your differential or not sure which replacement or performance parts you need? For that reason, many enthusiasts are considering the 10-bolt. When looking at the housing from the rear, an 8. Chevy 10-Bolt Models Although the 8. The coil spring mounts and the mounts for the upper trailing arms on the differential identify this as a Chevelle or Monte Carlo rearend, not one from a full-size car like an Impala.
If in doubt, consult one of our differential experts at!. The numbers should let you know what gear-ratio came from the factory, the date of production, where the unit was assembled, and whether the carrier is Positraction or not see charts. This means that in the event of an axle break, the wheel stays on the car. The Series 3 carriers are good for use with 2. The date and location of manufacture coding changed in 1971.
The coil springs also mounted to the axle tubes. The car versions were in production from 1971 to 1987. It was used in 1965 and earlier models with 196 ci or 199 ci inline 6 engines. Found in Falcon, Econoline, Fairlane, Comet. These have been around since 1975, and were installed under cars, small trucks, and vans up to the 2005 model year. The ring gear is as mentioned 8.
Has a 10 bolt cover as well as 10 bolts securing the ring gear. The following information is provided to help you identify the differential you are working on. Trucks have a smaller inner pinion shaft 1. Identifying the 10-bolt axle is easy. Another is to check the size of the pinion nut.
The easiest way to tell the difference is by looking at the brakes. These should be square blocks, each with the outer side 90 degrees vertical to the road and the bottom-side surface horizontal to the road. In actuality, the term 12-bolt is due to the 12 bolts holding the ring gear to the differential. Each was designed for use with a limited range of ring-and-pinion gears. This is a strong rearend, but unfortunately it was only used briefly and aftermarket support is poor.
Sometimes the shift code is stamped, and if the unit has a Posi-Traction, you see a P stamp. You can build these for performance, but if you use sticky tires, the superior traction and consequent strain from the grip will kill it quickly on the drag strip. This Tech Tip is From the Full Book,. The strap yoke if smaller can be drilled out to use U-bolts, but in some cases this leaves too little metal around the holes. Nothing could be further from the truth.
Year Vehicle Model Diagram 1983-1997 Aerostar, Ranger Ford with 7. As you can see, 13 is the hypoid gear count for the pinion and 40 is the ring gear count. You can see the dramatic difference in not only teeth but in overall diameter. Because these two sizes are so common in pre-1971 8. C2 and C3 Corvettes built from 1963 to 1981 used a non-standard 10-bolt design. Since it was so widely used, there is a better possibility of finding one of them at a salvage yard than locating a 12-bolt.
The U-bolts are the preferred method, if for no other reason than if either were to fail the U-bolt type can be easily replaced while the strap type might break off the bolt inside the yoke, making extraction difficult. To do this, the axles need to be removed and modified to install the C-clip eliminators. Like most 10-bolts, the axles are held in place by C-clips on the inner end of the axles. The owner stated that it was not a Posi-filled rearend, and came with gears he believed to be around 3. Hopefully, this short outline about the venerable 12-bolt will give you some insight when you head out to the next swap meet. The 2-Series is by far the most common.
The next number or two numbers will be the day of the month. However, the ring gear diameter is smaller than the 8. Once the C-clip has been removed, the axle slides out of the housing. These are two pinion gears for the 8. These lugs are arrowed in the image above.
Truck 12-bolts have an irregular cover with a ring gear pocket. In these applications, the upper trailing arms mounted on top of the differential, not the axle tubes. These are two pinion gears for the 8. Engine torque and suspension loads are placed on the rear axle assemblies, which are also subjected to moisture, dirt, and anything the road can throw at it. Professional technical support is available Monday thru Friday from 8am to 5pm Pacific Standard Time.