I am going to purchase a locker tomorrow or the next day and I found what I want. The only problem is there are two chioces. One for a rear with 28 spline or one with 30 something. How do I know which one I have? Is there a way to count them? Would I have to take the rear apart, drain all of the fluid (waste) and count, put it all back together, go to summit, tear it all back apart again and use more fluid just to put this thing in? That is a lot of crap. If anyone knows any other way, PLEASE let me know. He says there were the two that year and it could be either one. I am sure if I just guess, I'll get the wrong one. Thanks

Eric
p.s. 305 TBI 10 bolt 7.5

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Teal 1991 Camaro R.S., T-Tops,
Leather, Re-worked 700r4 also w/kit,
MSD ignition, MSD 8.5 mm. superconductor wires,
MSD Coil, ADS superchip, Open element air cleaner,
K-n-N filter, Gutted cat, Flowmaster cat-back system,
Edelbrock TES headers, March 3piece billet underdrive pulleys
3.73 gears
http://www.geocities.com/gitarz2/camaro.html
I was shocked to see that companies sold a taillight
set for a rustang! Since when do they have taillights????

 

Your 91 will be a 7 5/8" (7 1/2") 28 spline. There are no 30 spline 7 5/8" 10 bolt diffs.

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Follow my racing progress on Stephen's racing page
and check out the race car

87 IROC-Z SuperPro ET Bracket Race Car
461 naturally aspirated Big Block

Best ET on a time slip: 11.242 altitude corrected to 10.89
Best MPH on a time slip: 121.52 altitude corrected to 125.89
Altitude corrected rear wheel HP: 497.9
Best 60 foot: 1.546

Racing at 3500 feet elevation but most race days it's over 5000 feet density altitude!
Member of the Calgary Drag Racing Association

87 IROC bracket car, 91 454SS daily driver, 95 Homebuilt Harley