8 3/4 axle upgrade question

[Butch67]

Hey,
I am going to be changing my 8 3/4 rear axles from SBP to BBP as I have moved the springs inboard and mini-tubbed the 71.
Anyone have suggestions for rear axle replacements?
I haven't decided on if I should shorten the rearend or just go with a larger offset rim. I am looking to put 29" x 12.5" tires on. Or something around that size.
I have 15" x 10" ralley rims already, but what do you think about 17" ralley rims instead?
Thanks,

 

[grimreaper]

If you're mini tubbed you might as well narrow the housing. Dr. Diff will make axles to whatever length you need.

 

[d55dave]

When I did mine I used the yukon cut to fit axles. The ones they advertise as A body length were actually shorter than original A body axles and didn't work with old style sure grips (with two piece side gears). I also used big bolt pattern brake assemblies from a '74 A body 8 1/4. They bolt tight on. I would suggest chatting with Cass at Dr.diff. he has excellent prices, knows mopars, ships fast and is honest. I can't recommend him enough.

 

[AJ/FormS]

-Plan ahead.Drag slicks are available in 50 series 15s. Autocross kinda demands a lower profile, and sticky tire; Slim pickens in 15 inch.
-Brakes. If youre gonna need big brakes the often require larger diameter wheels.Plan ahead.
-For Street, it doesnt really matter.Personal preference or whatever shows up in your price range.
-Pick wheels that make you all tingly inside, put tires on em, and stuff them in the tubs. Measure up what you need and get it built.
-Or, Have your diff narrowed to fit a common backspace to keep your options open for later.I hate doing things twice.
-Opinions are like..........everybodys got one.In the end "you got to please yourself".

-Since you asked for an opinion on wheels, here it comes.
-295/50-15s on 10 inch rims with 4.5 bs look great;IMHO! Stick with 15s,unless you cant find a 15" tire for the competition that may interest you.
-The hands down bestest looking wheels for As are the polished aluminum slots of the muscle car era. Indy, Ansen, ETIIs; Theyre so beautiful. JMO. There it is.

 

[rumblefish360]

I'll end up hong the same route, mini tub.
I picked up axles from Dr.Diff. Stock A body size for the 8-3/4 in a '71 Duster.
I just asked for the larger 5 on a 4-1/2 and it wasn't a problem.

 

[flyfish]

I put 35 spline Moser Axles in mine, they work great....and I beat the crap out of my car on a regular basis.

Edit: Also mini-tubbed, stock width, 15x10 rims, just changed the back spacing to make the tires go under the car. Added a pic of each end of the car just for grins.