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8 3/4 to a Dana

Posted By: Stroker Scamp

8 3/4 to a Dana - 02/19/20 05:51 AM

I am going to order up a Dana 60 for the Scamp I am assuming will need to get a new drive shaft?
Info appreciated
Posted By: CSK

Re: 8 3/4 to a Dana - 02/19/20 06:13 AM

Originally Posted by Stroker Scamp
I am going to order up a Dana 60 for the Scamp I am assuming will need to get a new drive shaft?
Info appreciated


When I did the swap had to get the shaft shortened, get the 60 installed & see if the old shaft fits, if not measure & get it fixed.
Posted By: DusterKid

Re: 8 3/4 to a Dana - 02/19/20 12:21 PM

Originally Posted by Stroker Scamp
I am going to order up a Dana 60 for the Scamp I am assuming will need to get a new drive shaft?
Info appreciated


If rear ends are installed in the same location your drive shaft will have to be shorten.
Posted By: an8sec70cuda

Re: 8 3/4 to a Dana - 02/19/20 01:09 PM

Originally Posted by DusterKid
Originally Posted by Stroker Scamp
I am going to order up a Dana 60 for the Scamp I am assuming will need to get a new drive shaft?
Info appreciated


If rear ends are installed in the same location your drive shaft will have to be shorten.

iagree Somewhere around an inch if I recall correctly.
Posted By: polyspheric

Re: 8 3/4 to a Dana - 02/19/20 01:41 PM

Is the pinion stem at the same vertical height?
The Ford 9" is lower, affects the angle.
Posted By: hemi-itis

Re: 8 3/4 to a Dana - 02/19/20 02:16 PM

Good time to think about saving some weight.

Attached picture 220px-Jenny_Craig_at_the_Esplanade_-_Hillsboro,_Oregon.JPG
Posted By: 340Cuda

Re: 8 3/4 to a Dana - 02/19/20 02:19 PM

Yes it will weigh more but it will not slow your car down because of the increased efficiency.
Posted By: polyspheric

Re: 8 3/4 to a Dana - 02/19/20 05:10 PM

IIRC a test was run with an 8-3/4 vs. 60, and the ET was really close. The extra efficiency almost exactly made up for the extra 75 lb. weight gain.
IDR anything easy that saves weight on the Dana, though. Smaller brakes?
Posted By: MadMopars

Re: 8 3/4 to a Dana - 02/19/20 05:28 PM

Originally Posted by polyspheric
IIRC a test was run with an 8-3/4 vs. 60, and the ET was really close. The extra efficiency almost exactly made up for the extra 75 lb. weight gain.
IDR anything easy that saves weight on the Dana, though. Smaller brakes?


Although I don't have the weights in front of me, going with a spool should be worth something.
Posted By: John_Kunkel

Re: 8 3/4 to a Dana - 02/19/20 06:26 PM

Originally Posted by an8sec70cuda
If rear ends are installed in the same location your drive shaft will have to be shorten.

Quote
iagree Somewhere around an inch if I recall correctly.


1 1/8" to be exact

Centerline of Axle Shaft to
Center of Universal Yoke


8 3/4" 12.35"

9 3/4" 13.47"
Posted By: an8sec70cuda

Re: 8 3/4 to a Dana - 02/20/20 12:53 PM

Going from a locker/suregrip to a spool in a Dana is worth something like 20 lbs. Might be more than that actually.
Posted By: DoctorDiff

Re: 8 3/4 to a Dana - 02/22/20 05:05 AM

All else being equal, a 35 spline S-60 with a traction differential is 50 lbs heavier than a 30 spline 8 3/4" with a traction differential.
Posted By: J_BODY

Re: 8 3/4 to a Dana - 02/22/20 02:33 PM

The weight that was lifted from my shoulders on my S60 over the 8.75 that was in the car was much higher than 50lb! laugh2

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