Rear
- Thread starter cuda620
- Start date
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A833
Active Member
Plenty of people do it, less bucks than finding an a-body 8 3/4. Perches go in 1/2" each side. Wheel back spacing may have to change. Make the swap but take numbers of original rear distance from fender and compare to new space and change rims accordingly. You may get lucky and you're present tire wheel combo may still work. Good luck.
Frnknsteen
Well-Known Member
I just checked Doctor Diff for you under his axles section. He has the stock A body differentials listed as 52 5/8" from outside housing end to outside housing end. 68-70 B Body is listed as 54 15/16" from housing end to housing end. Please double check my math, but that is a 2 5/16" difference in width. Likely would have to adjust your backspacing by about an inch on each side. That is assuming the axles hang out the same amount on both differentials.
I was told by them that just switching to big bolt pattern in my Barracuda will cause the axles to stick out an extra 3/4", and that I would have to account for that in my wheel backspacing. I just don't know if that is additive to what I said above or not.
I was told by them that just switching to big bolt pattern in my Barracuda will cause the axles to stick out an extra 3/4", and that I would have to account for that in my wheel backspacing. I just don't know if that is additive to what I said above or not.
The overall difference is 3" wider on the 68-70 B-Body.
A833
Active Member
Cuda620,
Maybe I mis understood. I was under the impression you were looking to go from a 7 1/4 to an 8 3/4 and had a b body rear handy. If you have an 8 3/4 and are looking to go up to the 5 on 4.5" bolt pattern just do the axle swap. I just did mine with Dr. Diff axles. But you must use the brake backing plates from a big bolt pattern 8 3/4. I used ones from an E body rear and now have 11 x 2.5" brakes up from 10". I run stock Mopar steel rims with E 60 14" and had no interference issues at all. Thats on my early A 64 Valiant.
Maybe I mis understood. I was under the impression you were looking to go from a 7 1/4 to an 8 3/4 and had a b body rear handy. If you have an 8 3/4 and are looking to go up to the 5 on 4.5" bolt pattern just do the axle swap. I just did mine with Dr. Diff axles. But you must use the brake backing plates from a big bolt pattern 8 3/4. I used ones from an E body rear and now have 11 x 2.5" brakes up from 10". I run stock Mopar steel rims with E 60 14" and had no interference issues at all. Thats on my early A 64 Valiant.
Yes goin from 7.25 to 8.75 if I can find one reasonable. I now have a truck dana60 with the narrow axle tubes to narrow if I don’t find one. Mosier is 30 minutes from me. I’ve used em before. Thanks
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