I have a 68 Camaro with a 12 bolt rear end and I am not sure if it's the rear end for a Camaro It shows signs of some removed metal which looks like it might have been a Chevelle rear end. So my question is what is the difference between the to I know that a chevelle is a little wider but how much? Also is there a way that I can tell if the posi unit is a 3 or 4 series carrier? tongue.gif
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The '65-'67 Chevelle rear end is 60 inches wide overall, the same as the '67-'69 Camaro rear end. The '68-'72 Chevelle rear end is 61 inches wide overall, the same as the '70-'81 Camaro rear end. The casting number on the 3 series posi is EDB30140 and the number on the 4 series posi is EDB30174.

Ok pulled off cover and the numbers on the carrier ED 30140 PM1 353
on the ring gear GM 3862525 11 41 4 69 with 41 teeth on the pinion gear GM 38262369 or 23693862 41 11 with 11 teeth if I am doing my math right thats 3.73 gears on a 3 series carrier with an over all mesurment of 60 inches axel face to axle face Is the a posi or limited slip diff? and I will be swaping the gears for a pair better for road trips if any one is intrested email me. graemlins/beers.gif

Posi is Eaton's name for their limited slip differential. Auburn uses Sure Grip, Dana uses Power Lock, Ford uses Traction Lock..... They are all just trade names for limited slip differentials.

Trisprint,

I know this is old, but do you still have the 3.73 gears available?

630-269-4134 Dale

I don't know what year rearend you have but if they used a 69 chevelle unit it shouldn't be hard to tell because there are to big round ears for the upper control arms and would be hard to grind off.