how do i identify my gm rear end
The best way to be sure of which axle you have is by the Bill of Material Number stamped on the right hand axle tube. The BOM will identify the model number the gear ratio the type of differential and all component parts.
Ask Away With Jeff Smith 8 2 Or 8 5 How To Identify Gm 10 Bolt Rear Ends Rear Ended Bolt Jeff Smith
152 rows Identify your GMC or Chevrolet rear end gear ratio by the RPO Codes usually.
. Having a visual reference is probably the easiest way. If it is an early 82-inch 10-bolt Camaro housing the casting number will be 3894859NF. Not all applications will have one of these codes but when they apply they will be listed in addition to an axle code found in the main RPO axle code list below.
The Bill of Material BOM number is used to identify Dana differentials. The distance between the bottom center bolt in the cover and its adjacent bolts is 3 14 inches. For the 1972-75 Camaro style model 85-inch 10-bolt casting numbers weve found a 410409N and a 410408N.
The round 10-bolt cover with a bulge for the ring gear identifies this axle assembly as an 85-inch 10-bolt. GM Vehicles come with RPO codes which are 3-character codes that designate various features options on your vehicle. The axle ratio is derived from dividing the number of teeth on the ring gear by the number of teeth on the pinion gear.
The Dana Models 60 and 61 look the same and have the same shape differential cover. The most noticeable difference is the reinforced cast iron differential in the Dana 61. 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.
These RPO codes are used to idicate a specific type of differential andor ring gear size. On some tags the first 2 digits dont appear on the tag but they must be used to identify the axle. A visual chart of different GMChevrolet rear ends is found on Ring Pinions differential types web page see References.
First look at the casting number of the center section. Whenever possible reference the tag numbers when ordering parts for your Differential. GM RPO Axle Code Notes.
Chevy 10- and 12-bolt axle assemblies have been standard equipment on GM passenger cars muscle cars and trucks for decades. The oval-shaped cover measures 8 516 inches by 10 916 inches. The inspection cover is on the back of the housing seen by looking.
Although the 75-inch 10-bolt closely resembles the 85-inch housing you can positively identify the Chevy 75-inch rearend by measuring it. We carry everything from the 725 IFS front end parts to the large 115 rear end parts for 1-ton trucks. The Bill of Material BOM number is used to identify Dana differentials.
Answer ID 3975 Published 01182011 0818 AM Updated 12182018 0129 PM. The easiest way to identify the 82-inch rearend at a glance is by the shape of the housing and the spacing between the lower bolts on the cover. The rugged reliable and efficient Chevy 12-bolt has established itself as the preeminent rear differential for GM muscle cars since its debut in 1965.
How do I identify my GM 82 rear end. Please open the attached documents to see pictures of the cover gaskets and differential covers for many popular rear ends. Later-model Dana axle identification charts may start off with the first three digits of 200 rather than 60 or 61 for example 200561-1.
However the smaller 10-bolt unfairly gained the reputation as a weak and inadequate rear end. Please select a rear end that matches your vehicle below. The 10-bolt differential cover is located on the rear of the axle and is an 11-inch x 1025-inch oval.
These differ based on the gear ratio. All Chevrolet rear ends can be identified by comparing the gasket shape to an identification chart similar to the one found on Drivetrains differential identification page see References. How to Identify a Chevy Rear End.
There are several ways to identify the axle under your vehicle. Shop by your differential. Accurate identification using the GM RPO code assumes that the rear end.
See the Spicer Axle Identification information. If the ID tag or stamp is missing or unreadable differentials can be. The two lugs on the lower case at the 5 and 7 oclock positions are also identifying features.
RPO codes can be found by referencing the Service Parts Identification sticker typically located in the glove box compartment or near the spare tire or by scanning a QR code on 2018 and up GM vehicles located at the bottom of the driver side. 198 rows You can typically find your RPO code on driver side door panel or glove box. Count the number of inspection cover bolts on the rear end housing.
The rear covers shape and the number of bolts are identifying features for GM rear differentials. GM RPO Codes or General Motors Regular Production Option codes contain lots of valuable information about your GM vehicle. We make it easy to verify your exact rear end by providing specs and year make and model applications for each differential listed.
Identify your GMC or Chevrolet rear end gear ratio by the RPO Codes usually located on the placard labeled Service Parts Identification inside the drivers door panel or glove box. How do I identify my GM axles. General Motors has a wide range of front and rear ends.
The axle gears are a part of the differential and are located behind the inspection cover on your axle. The Dana axle identification BOMs are six digits long and begin with the number 60 or 61 followed by 1 or 2 digits such as 605561-1. Traditional BOMs are 6 digits followed by 1 or 2 digits and start with the numbers 60 or 61.
For a 373 ratio there may be 41 teeth on the ring gear and 11 on the pinion for 372.
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