Locking Differential Interchange

[JDHodge]

Can someone tell me what differential will interchange with Trailblazers? Looking for a locking differential to put in my vehicle. I figure GM did not make a special axle/differential for the Trailblazer. Probably interchanges with half the trucks they sell.

Thanks.

[nodemgr]

Sorry don't have an answer, but I am curious about your question. My 2k4 TB has the locking differential option. Are you looking for a cheaper or a better alternative to a new part?

[JDHodge]

Have you priced a “new” differential for a 05 Trailblazer? The bare chunk is over $500. So yes, I want to save money.

I have much experience with GM interchangeability. The Trailblazer rear end is probably unique to that platform but the “guts” are most likely common with other GM products. The ring & pinion and differential were probably “borrowed” from the S-10 truck or full size truck platform. Since I can install differentials (and have to “proper” tools to do so); why not got a chunk that is used, will work, and is around $300 complete?

[JDHodge]

The Trailblazer/Envoy's use an 8" ring and pinion. I was mistaken when I assumed they must share ring & pinion/differential with another GM model. So far the only ring & pinions available are 3.42, 3.73, & 4.10. This 8" ring & pinion was introduced with the 2002 model year. So new that I have not found any used assemblies... yet.

For those interested, visit this site for ring & pinion/differential listings:

http://www.usgear.com/tl/gm1.htm

[trazam1986]

Anyone one know the RPO code for the locking differential? I just bought a 2002 trailblazer and would like to know if mine has it. Thanks!!!

Jim

[emitchell233]

Mine came with it... I have the LS 1SC package. It came on that one. Other than that, don't know what to tell you.

[lkurek]

All locking differential RPO's for GM cars is G80

The other "G" code indicates the gear ratio....

[fzflyer]

Wanted to know what you guys know about the "Differential Locking Assemblies" that are available for "upgrading" and if anybody has ever installed one. I have an'04 TB LT without the locking option. Has anybody installed one or know anything about them.