How can you tell if a 12-bolt posi rear end?
The easiest way to identify a 12-bolt rearend is obviously by the 12 bolts holding the rear cover onto the axle housing. The pinion shaft on passenger-car differentials is 1-5/8-inch in diameter and the cover is oval, measuring 10-15/16-inches wide by 10-5/8-inches tall.
What size is a Chevy 12-bolt rear end?
The rearend cover on passenger car 12-bolt rearends is oval, measuring 10-15/16-inches wide by 10-5/8-inches tall. It also has an upsidedown, V-shaped protrusion that is there to direct oil to the carrier bearings.
How do I identify my GM differential?
Information about Differentials in GM vehicles can usually be obtained by looking at the RPO or “Regular Production Option” codes contained in the Service Parts Identification tag in the glovebox. Whenever possible, reference the tag numbers when ordering parts for your Differential.
How do you find out what Differential I have?
Visual Differential Identification Without an ID tag, differentials are identified by the number of cover bolts, the distinctive shape of the cover, the number of ring gear bolts, and ring gear diameter. They can also be identified by whether the center section is an integral or dropout design.
What rear end do I have by Vin?
Identify the VDS section, the fourth through eighth digits of the VIN. This section typically includes information such as the vehicle model, engine size and body type. While not every vehicle manufacturer includes gearbox ratio information in the VDS, this will be where the information is found if it was included.
Is a GM 12-bolt rear end good?
When the 12-bolt rearend is properly assembled, it’s the strongest passenger-vehicle rearend Chevy ever produced. GM engineers designed the 12-bolt to be a durable piece that could handle the torque output of its big displacement engines.
How do I identify a 12 bolt rear end?
Externally, the 12-bolt rear end is identifiable by the cover, but internally (once the cover is removed) it can be identified by the size of the ring gear, which is 8-7/8 inch in diameter. Code ID. 12-bolt axles can be identified by casting numbers on the bottom of the cast-iron center-section and on the front of the passenger side axle tube.
What kind of posi do you offer for the 12-bolt rear?
We offer several versions of the most respected posi ever offered for the 12-bolt rear. Standard Stock Street Units Tuned Units B.O.E. Units Standard stock units are cold stock out of the box the way we buy them.
What is a GM 12-bolt rear axle?
The GM 12-bolt rear axle assembly receives its name due to having 12 bolts on the rear cover of the housing. This rear axle was available in GM’s high-performance intermediate cars, full-size vehicles and light-duty trucks. The 12-bolt rear end was introduced in the early 1960s and was used from 1964 to 1972 in GM cars.
What are the ratios on a chevron 12 bolt passenger car?
CHEVROLET 12-BOLT PASSENGER CAR Ring and Pinion Sets We offer complete coverage of ratios for your 12-bolt rears. The first letter of the part number indicates manufacturer. The last three numbers are the gear ratios. 8.875 Ring Gear Diameter 30 Spline Pinion 1-1/8” Pinion Nut Ring Gear Bolt: 9/16” Head, 3/8”-24 R.H. RC12-3.42 RC12-3.55 RC12-4.10