8 3/4 rearend swap in 70 dart

Jarod340 · Feb 20, 2017

i have a 66 barracuda A body 8.75 rearend, and Im going to swap it in my 70 dart.
what complication or issues will I faceother than drive line shortening and using 8.75 shock mounts and u bolts? will the brake lines in my 70 dart 7 1/4 work?

any info would be great

72bluNblu · Feb 20, 2017

You probably won't be able to use the brake lines, the vent bolt/block probably isn't in the same place and the 8 3/4" housing is about 1-1/8" wider than a 7.25" housing so the lines would be short. Other than that you already got most of it, shorten the driveshaft, use 8 3/4" shock plates and u-bolts for a 3" diameter axle tube, check the yoke to make sure you can use the same u-joint or if you need a conversion. The parking brake lines should be ok, same for the brake hose coming down to the rear axle but those are usually worth replacing anyway.

Jarod340 · Feb 20, 2017

72bluNblu said:
You probably won't be able to use the brake lines, the vent bolt/block probably isn't in the same place and the 8 3/4" housing is about 1-1/8" wider than a 7.25" housing so the lines would be short. Other than that you already got most of it, shorten the driveshaft, use 8 3/4" shock plates and u-bolts for a 3" diameter axle tube, check the yoke to make sure you can use the same u-joint or if you need a conversion. The parking brake lines should be ok, same for the brake hose coming down to the rear axle but those are usually worth replacing anyway.

Awesome thanks

Jarod340 · Feb 20, 2017

thanks

72bluNblu · Feb 20, 2017

The driveshaft usually needs to be shortened about 2.25", but you should measure that on your car before you have the driveshaft cut down.

440DART1970 · Feb 20, 2017

On the contrary some versions of the brake lines will work from slant 6. I actually went crazy ordering lines from Summit to only return three of them to get the right ones once I remove my 7 1/4 rear the brake lines are almost identical and I could have used them.

I'm actually in the 8 3/4 rear swap process myself but with SS leafs added