7.5 to 8.25 Drive Shaft?????

[MoparBrit]

Hi all,

Glad I went back through and looked again at the suggested drive shaft amount to shorten. Looks like the 1.5" figure I had is suggested for the swap to an 8.75 rear.

I've got a /6 904 auto (going to keep that in for a while) '71 Dart Swinger. Rear in it is the 7.5 with the small bolt pattern wheel studs. Found a good 8.25 open 3.21 rear out of a Scamp and want to swap it in to get the large bolt pattern and for a bit more strength for way down the road when I pop a V8 in the car.

What I need to know though, is if you have to have the driveshaft shortened and if so, by how much?

Also, I looked on some autopart sites and they list a different rear brake hose for the '71 /6 and the '75 Scamp that the rear came out of. Do I need to buy the '75 Scamp hose or will the existing hose work for the swap?

Thanks in advance for your help.

Cheers

 

[340mopar]

Going from a 7 1/4 to an 8 1/4 it is 1.6" and going from a 7 1/4 to an 8 3/4 it is 2.26"


Chuck

 

[MoparBrit]

Thanks! I'll start calling around now and find out what it is going to cost to get it shortened and balanced. 1.6 inches it is.

Cheers

 

[mopar_1974]

what will be the length needed to shorten if the 360/727 swap is done as well as a 7.25 to 8.25?

 

[340mopar]

what will be the length needed to shorten if the 360/727 swap is done as well as a 7.25 to 8.25?

If you mean 904 to a 727 and a 7.25 to an 8.25 it would be 5.61";

4.01" for the difference in the trans and 1.6" difference in the rear.


Chuck

 

[curtis6592]

so to switch 904/7.25 to 727/8.25 is 5.61 correct