Hi! Can anyone tell me what size the rear end is? Or do i have to go out in the snow and look for the code on the axle? Thanks

 

It's a 7½" 10-bolt.

 

G80 is the RPO for the Limited Slip rear option on the 7 5/8 10-bolt. For the gear ratio you will need the RPO code or pull the cover.

 

"Codes" are worthless. All they tell you, is what the rear end housing came with; not whether it's the rear that came in the car, or whether whatever it came with, is what's in it now. That includes "G80". All that means is that the car's original rear CAME WITH a limited-slip carrier; that may have no connection whatsoever with what's in it now.

If you want to know what's REALLY inside your rear end (your car's rear end, that is...) the only way to know accurately is to take off the cover and look.

 

10 bolt cover = 7.5" and 7 5/8" 10 bolt corporate


9 bolt cover= borg warner

G80= limited slip unit


thats it

simple

 

OK, so how do i know which it is? A 7.5 or 7 5/8? I need to figure this out like now, cause i have a guy who has a series 3 eaton posi unit i want. Thanks

 

Right, that's the one you've got; not the 7.75".

 

So i have the 10 bolt 7.5 then? Just to clarify.

 

Right; the 7.5"/7.625".

There's no difference, except for some details inside the carrier. The carriers are the same as far as how they bolt in, and all carriers interchange into all housings, and all gears bolt onto all carriers. Subject of course, to the 2 series vs 3 series constraint.

 

The 10-bolt is 7 1/2" up to 1988, I think. Then its 7 5/8". They're interchangeable, as said above.