i have a 72 duster and i originaly had a 8 1/4 rear end out of a 73 dart but it is messed up, so i put a 8 3/4 out of a e-body in it and now i started looking at the drive shaft whe i took the old rear out i just pushed the drive shaft into the tranny and it left about a 3 inch gap and now the new rear is in and the gap looks the same and i pulled the drive shaft into the new rears yoke and it went right into place. are the drive shafts for the 8 1/4 and 8 3/4 the same length. i have to take it to the drive shaft place any ways since the new rear has the bigger yoke i was just wondering if i need to have it shortend or if it will be ok how it is?
8 1/4 to 8 3/4 driveshaft changes
- Thread starter duster-z
- Start date
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fishy68
Tyr Fryr's Inc.
No their not the same length but there's not a big diff. Maybe like 3/4" difference. If you had to pull it out 3" too get it in place it's way too short and you need a longer driveshaft. You should only be able to pull it out approx. 3/4"~1" max. With it too short it may work for a while if it's a low power application but it may also vibrate and eventually will fail.
cudamark
Well-Known Member
Like fishy68 said, it looks like it needs to be longer, not shorter. Normally, there isn't enough difference between the 8 1/4 and 8 3/4 to need a new driveshaft but it looks to me like your old one wasn't long enough to begin with. Maybe that was some of the vibration problem you had.
i just realised the 2 to 3 inches was with the rear end off the ground and the jackstands underthe frame it was at right aroutnd 1in away with a load on it but one of the new axle plates was bent so now i have to get another one first
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