im currently running a 7.5 with 4:10 gears posi trac in my Malibu out of a 1982 el camino that originally had posi 2:41 gears. if anyone is wondering about it being dependable my motor is pushing over 450hp to a worked th350 and I haven't had any issues with the rear end. when I pulled mine out the junkyard it had a metal stamp on it saying posi fluid only and a code stamped on it but I would have to go look at the car for the code.
does anybody have a backing plate to backing plate measurement for our factory 7.5/7.625" ? reason I ask is the 9'' G-body I ordered from a rear end shop has my wheels /rim VERY close to my frame rails, and I sold my original one before I thought to measure it.
does anybody have a backing plate to backing plate measurement for our 7.5/7.625'' rear ends? reason I ask is I installed a G body 9" and my wheel/rim are VERY close to my frame rails and I sold my original before I thought to measure it.
Hey fellas, resurrecting an old thread here.
Through a very lucky set of circumstances, I stumbled on an '85 442 in the wrecking yard here. Naturally, I first determined that it was indeed the 8.5" 10 bolt, and mostly confirmed that it had the 3:73 gears (about 80% sure). I checked the RPO code on the underside of the trunklid, and it did NOT have the G80 (posi) option. Seeing that it's definitely stronger and better geared than my 2:56's, I snapped it up today anyways.
Now that it's out and safely at home soon to go in, I tried researching the axle code stamped on the front of the passenger side tube. Unfortunately, nothing I've found on any of the common sites corresponds to what my stamping actually is.
Can anyone definitively decode and identify what my axel code is?
In case it's not clear in the photo, it reads:
8TF G 007
Thanks in advance for any help anyone can provide on this.
The cover will definitely be removed and repaired/replaced as the auto wreckers I got it from punches a hole in the bottom of the cover to drain the oil before it hits the yard.
With no oil in it, fresh lube is mandatory.
All the research I've done so far points to most if not all 442 rears in '85 as having 3:73 gears. I've already confirmed its not a posi, but I found that the axle code being different than what's listed online as strange. Still hoping someone can shed some light on what this code breaks down as or meant originally. Anyone?
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