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'05 TB 4.2 EXT
I'm sure whatever he put in the vehicle won't be referenced by the RPO code any longer, especially when you state: "he swapped out the factory rear end with something else".Hey! New to the forum. I inherited a 2003 Envoy from my grandpa when he passed this last summer. I’m fairly confident he swapped out the factory rear end with something else. Is there an easy way for me to identify if it has an LSD or the Eaton locker without referencing the RPO codes in the glovebox? Thanks!
Testing it could create a problem if he used a Gov-Lock type, although I'm pretty sure with the <false> ideal that it is bad design, not many would consider going TO it.
Did he want to simplify and go with an open differential? Who knows!
You can confirm if it is a limited slip type, but no guarantee what system he bought. If you decide to "test" it by doing burnouts with one wheel in the dirt and the other on asphalt ... you can damage any of the limited slip driveline by trying that process to diagnose what you've got.
Pull the cover to confirm it ... are our TBs "C-type"?
I dunnow yet ... haven't had to open mine up so far ... I think they are though.
Jacking the rear wheels off the ground and manually trying to spin one wheel or the other ... won't work, not conclusively.
You SHOULD find out, for sure, 'cause you need to use whatever secret sauce it needs when you service it every once in a while.