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71 Grand Prix Rear end/drive shaft questin

2K views 4 replies 3 participants last post by  Black71gp 
#1 ·
I have a 71 Grand Prix. I had the 8.2 ten bolt. I found an 8.5 out of a cutlass, and rebuilt it with 3.73's and a posi. put it into the car and the old drive shaft does not fit. I did not realize the 8.5's are 1" longer than the 8.2's... grrr stock driveshaft is 55.5" center of ujoint to center of ujoint. Does anyone know a car that came with a smaller driveshaft? I have a TH400 and 8.5 rear and need around 54" driveshaft. Any help is appreciated. THanks
 
#3 ·
ya thinking of it.. i really have not beefed much up.. engine is mostly stock with a slight cam, trans was just replaced cause the old one was slipping. and new rear end cause it was cheaper to get a posi and gears for the 8.5 that try and find everything for an 8.2

I dont drag race or anything so not worried too much about that..
 
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