How Do I Identify My Chevy Rear End?

How do I identify my GM rear 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..

What’s better 10 bolt or 12 bolt rear end?

First, the 10-bolt’s pinion shaft diameter is 1.438 (25 splines) while the 12-bolt is 1.625 (30 splines) which makes the 12-bolt 13 percent larger in diameter and therefore stronger. … The 8.2 uses a 28-spline axle (1.20 inches in diameter) while the 12-bolt uses a 30-spline axle (1.625 inches in diameter).

Can you tell gear ratio from Vin?

The vehicle identification number (VIN) is a 17-digit code that is used to identify and track every automobile produced. Each number and letter contained within a VIN reveals information about the vehicle, such as the make, model, production year and engine size. … The codes on that tag will tell you the gear ratio.

What is 10 bolt rear end?

The 10-bolt differential cover is located on the rear of the axle and is an 11-inch x 10.25-inch oval. An important thing to note is that the ring gear bolts are . 4375-inch left-hand thread on all 8.5-inch differentials.

How much HP can a 12 bolt rear end handle?

A complete 12-bolt rearend with drum brakes weighs around 185 pounds. It uses 2 to 3 percent less power than a 9-inch and even factory pieces are capable of withstanding 500 hp using 30-spline axles.

How do I know if I have a limited slip differential?

The easiest way to tell if you have an open differential is to jack up the car and spin one of the rear tires. If the other wheel spins in the opposite direction, you have an open differential. If it spins in the same direction, you have a limited slip differential, or LSD.

What size is my rear differential?

The size of a rear differential, or rear end, is determined by the diameter of the ring gear inside the differential housing.

How do you know what gear ratio you have?

Count the number of teeth on the pinion gear and count the number of teeth on the ring gear. Divide the ring gear teeth number by the number of teeth on the pinion. The result is your gear ratio. Note: you may need to round off the number.

What is the best rear end for drag racing?

Ford 9″Ford 9″- The Ford 9″ is definitely the most popular of the rear ends in drag racing. It offers good strength characteristics and the largest variety of gear choices. The thirdmember type center section allows a racer to have multiple gear ratios available and is much easier to change than a rear loading type rear end.

How do I know what gear ratio My rear end is?

Turn the wheel TWO revolutions and count the number of driveshaft turns. The number of driveshaft rotations will help you determine your rear axle ratio. For example, if it turned 3 and a half times, it’s a 3.50:1 ratio. If it turned 4 and a quarter times, it’s a 4.25:1 ratio.

How do I know what rear differential I have?

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.

How do I identify my 8.5 gm rear end?

When looking at the housing from the rear, an 8.5 will have two squared off chunks of casting hanging on each side near the bottom of the differential. An 8.2 (shown) will have the same contour as the cover. Most 8.2 factory covers also have the strange protrusion at the top.

How much horsepower can a 10 bolt rear end handle?

about 450 HP7.5” 10 bolt GM rear: It will take up to about 450 HP IF the axle tubes are welded to the housing and either a differential cover with preload bolts is installed or straps are installed over the carrier bearing caps along with longer bolts.

How do you know if you have Positraction?

Re: how can i tell if i have a posi-traction? Hard way is to jack up the rear so both tires are off the ground, block the front tires, place trans in “N”, then rotate one tire forward. If the other tire rotates in the same direction it’s likely a posi.