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GM Posi ?

4K views 5 replies 5 participants last post by  TORI1 
#1 ·
I'm gonna upgrade from an open to a Posi or Limited Slip. I have my eye on a GM 8.5 " 10 bolt 28 spline for sale on Ebay. My 355 is basicly a 1970 LT1 pushing about 320 HP. The gear ratio is 3.73 The car will be used 90% for street use. Can I get buy with this GM posi or should I set my sites higher?
 
#2 ·
GM makes pretty good posi units. I would think you'll be fine but keep in mind that anything used is probably going to need to be rebuilt first.
 
#6 · (Edited)
Series 2 Or 3

It says neither 410409 or 410408

the ONLY numbers on it are as follows:
(all are on the opposite side of where the ring gear would be (i guess passenger side of the carrier))


in large cast numbers appears 04-6
in smaller cast numbers appears both 8Y, and 18D (maybe 8D)
and in stamped numbers appears E61 E61A

no other numbers appear on the entire carrier

what do you think I have??? eaton??? GM??? series 2 or 3 ????
 
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