Drive shaft length for 8.5 rear end in g body with 700 r 4

dickeymoore

Dragway Regular
Mar 19, 2007
818
0
16
Atlanta,Ga.
I have a 1980 Chevy Monte Carlo with a small block Chevy 400 and a 700 R4 Transmission in it with a 7.5 rear end and I'm thinking replacing the rear end with a 8.5 Grand National Rear End how long does the drive shaft has to be with the 8.5 rear end?THANKS
 

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