Chrysler 8.75 for Aspen/Volare
 

Need some advice for installing an 8.75 in a 79 Aspen. Would a B body rear end be the closest fit for width? Currently has an 8.25. Thanks, Craig.

Re: Chrysler 8.75 for Aspen/Volare
 

What kind of power and which class are you setting up for? Early B Body is close but you still have to offset springs and/or move the pads. If you’re going with a lot of power and/or trans brake go directly to a Dana.

Re: Chrysler 8.75 for Aspen/Volare
 

68 to 70 B body is the one you need.

Re: Chrysler 8.75 for Aspen/Volare
 

I put an 8 3/4 from a 71 Charger in a 76 Volare, the locating pins were less than an inch off, I elongated the shock plates with my die grinder, it was almost a bolt in.

Re: Chrysler 8.75 for Aspen/Volare
 

Used 69 b B body on my sons 76 volare and it fit without much trouble at all . And I am not a mopar man at all YET. lol Now if I could just find a grill that's what I am having problems with.

Re: Chrysler 8.75 for Aspen/Volare
 

Re: Chrysler 8.75 for Aspen/Volare
 

Find a 66-67 rear, shorter that the 68-70. Doesn't it have to be the same back plate to back plate measurement as the 8-1/4 or whatever was in it?Gotta put axles-spool in anyway, cut it to the right length.

Re: Chrysler 8.75 for Aspen/Volare
 

He has to tell us if the car is a Stock Elim car or?

Re: Chrysler 8.75 for Aspen/Volare
 

It's a 318 4bbl. N/SA. also toying with the idea of building the 8.25 rear. Just not sure if it will hold up over time. My gut feeling is to go with the 8.75, just a little more hassle to locate the best choice housing and modify it to fit.

Re: Chrysler 8.75 for Aspen/Volare
 

Only if you're using the same wheels and tires, which you're not.

Re: Chrysler 8.75 for Aspen/Volare
 

We run a N/SA aspen.......We have broken several 8 3/4 rears.
8 1/4 is weaker and murder to find gears for low than 4.5.

Re: Chrysler 8.75 for Aspen/Volare
 

what gear ratio are you running in your combo?

Re: Chrysler 8.75 for Aspen/Volare
 

Well that settles it, the 8.25 is out! You have years of experience with this particular combo and I take your word as "gospel" in this matter! Thanks for chiming in John. Craig

Re: Chrysler 8.75 for Aspen/Volare
 

. Probably a 4.88. Unless GTX John has a better suggestion. The car is ready to run except for the rear end and springs. Thanks, Craig.

Re: Chrysler 8.75 for Aspen/Volare
 

I would have thought 5.13 for the short stroke 318 and 4.86 for a 360. But the higher the ratio, the weaker the smaller teeth are. 4.86 worked well for my crate 360. I was wondering at what point weight-wise one would consider going up a step. I'm still working on a Aspen wagon for J at almost 3,800 lbs!

The Dana 60 suggestion is a good one. Weight is hard on 8 3/4's and they're not as easy to check the teeth on.

There was a fast Mirada that ran an 8 1/4" rear for a long time. But I don't know any more details.

Re: Chrysler 8.75 for Aspen/Volare
 

What are you saying?? Please explain that statement.

Re: Chrysler 8.75 for Aspen/Volare
 

Paul can elaborate for himself but imagine he’s just stating that since the OP is going to run a stocker he’ll need to run a racing wheel which offers different offsets so he’ll just have to measure what will work. BTW a 10 inch wheel is what’s needed.

Myron, I ran a 5.13 in my 360 Volare (~3500 pounds) and ran 6800,6800 and 7200 through the lights. Think that’s pretty close but perhaps either GTX John or George Widuch (Marcus) or one of the Loge boys will chime in.

Re: Chrysler 8.75 for Aspen/Volare
 

[Paul can elaborate for himself but imagine he’s just stating that since the OP is going to run a stocker he’ll need to run a racing wheel which offers different offsets so he’ll just have to measure what will work. BTW a 10 inch wheel is what’s needed.]
That's understandable, but what I said, he has to use-make a housing with the same width, backing plate to backing plate as original (rule book) then find a rim that will work. In other words If that 8-1/4 is 53" the 8-3/4 has to be 53" so find whatever, cut it to the right size, unless NHRA is not checking that anymore.?
Mike

Re: Chrysler 8.75 for Aspen/Volare
 

5.13 gear is what we run unless going to Denver......

We ran (carefully) Mirada for a long time (Now belongs to Bakersfield
Track Manager who won class at a Nationals this year with the old Girl)
with a very expensive/trick 8 1/4 Paul Rossi built.
It held up well.....But we kept our fingers crossed !

BTW it is still in the car to this day and racing. Again = Gears
past 4.50 are no longer available and that is not enough gear
for a 3500 lb. plus 318 Stocker to be very competitive.

Re: Chrysler 8.75 for Aspen/Volare
 

i just want to be clear with your statement. When you say gears above 4.5, you are talking about the 8 14"

Re: Chrysler 8.75 for Aspen/Volare
 

Correct David: It is the 8 1/4 that is ratio challenged,,,,, I get
less clear every year and often confuse myself too!

Larry Shepherd said at a Seminar in mid 70s that Mopar saved
around a dollar when the went to a 8 1/4 over a 8 3/4.

Re: Chrysler 8.75 for Aspen/Volare
 

Thanks to everyone for their input, I have my eye on a complete 8 3/4 rear end on Craigslist. Have a great Thanksgiving weekend, Craig.