The Granville differential utilizes a '71-76 MP series carrier & ring & pinion with a round flat style pinion flange. This ring & pinion is a direct descendent of the 65-70 big Pontiac rearend. No aftermarket gears are avail for either. Used gears... 3.42's were as low as possible for the '71-76 type MP series & are near extinct. Only found on '71 non a/c 3spd 400 & select mountain pkg or trailer package equipped Pontiac big cars.
While both the 65-70 & 71-76MP series utilize 8 7/8" diameter ring gears & are attached with 12 bolts, they do NOT share the common 12 bolt CHEVY 8 7/8" car or truck Ring & Pinions or carriers. The MP series carriers are wider from bearing to bearing & will not fit Chevy 12 bolts.
The '73 GP rearend fits 73-77 A & G series GM cars & will NOT bolt in '64-72 Lemans-GTO or 69-72 GP's. The upper control arm perches are placed in a different spot & are angled wider. If it is original, it will have bolt in axles & is a decent core to build up for a '73-77 GP or '77 CanAm or #1 buyers...'73-77 GM factory stock (circletrack) builders. One can also trim & grind all the brackets off of the housing & correctly weld leaf spring mounts on to get a correct width 2nd Gen Firebird R/E with desireable bolt in axles.
Good deal on the parts cars...just antied up $200 on a 69 GP SJ parts car. 4 hour drive home & a combined 14 hours getting it out of the woods, whew... made for a long weekend.
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Buzzards gotta eat... same as worms.
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