[core]

I am installing a 500 HP motor into my 1975 valiant. I believe the rear end is 7 1/4". Will it handle the horsepower or should I start looking for an 8 3/4" rear end. Also is posi something that should be considered.
Thanks for the help

 

[core]

So it looks like I'm going to start looking for a rear end. From reading some other post it looks like a 8 3/4" would work. Would you agree?

 

[core]

So if I install a 8 3/4" rear end then I am going to have to find some new small bolt pattern axles. Is this so that the tires that I have now will fit?
Also on the valiant the rear tires are ressesed into the wheel wells and I would like to install the largest tires as possible. Should I take that into consideration when looking for the axles?
Will the 8 3/4 rear end just bolt into position with out any modifications?
Thanks again for all the help. I would not be able to even consider doing this project with out this forum.

 

[core]

I am having a hard time finding a 8 3/4 rear end. I might have a found one with a 10 bolt pattern, is that correct?
Are all 8 3/4 end all the same? Will it bolt right in or will modifications need to be made?
Once I find the rear end how can I tell what it has for gears? Would it be better to just suck it up and order a complete rear end from Mosers or is it worth the search for a true 8 3/4" rear end?

 

[core]

I found a 8.75 out of a 68 barracuda. The seller is telling me that it is a cone type. Should I stay away because from what I have been reading the cone types can not be rebuilt. The rear end is apart and to me that sends up a red flag. He is asking 600.00 is that a far price for something that might not be able to be rebuilt?

 

[core]

From the photo I was able to see 2070741 from everything that I have been reading has told to stay away. The forums are talking about the big nut. I think that it refers the axle? So if it is a 741 core type if the core section goes then I can just change it out of pumpkin ? Not sure on the axle type or length is there a certain size I should be looking for?
Thanks for the help.

 

[core]

I bought the 741 and the seller had changed out the pinion with a 1 3/4. Does that change make rear end into a 742?
Also the gear is 3.73 and they are brand new, so I was wondering if these gears will work. I am just going to use my valiant for street use and to go to shows. Will this gear be ok for highway use or will the RPM clime to high?

The axles are 4.5 and my valiant has drum brakes, so will I need new axles? If I get new axles I can keep the drum brakes or should I just switch over to disk?
I need to figure out if these axles will even work with my car. The seller told me that the set up was 55" over all and 44" center of perches.

 

[core]

The 8.75 came with the casing, gears and two axles, no brakes. I did not end up buying the cone style rear end because I found a clutch 8.75 with posi that was just completely rebuilt. The seller did recommend to replace the bearing with tapered ones even though the bearings are new. The axles have the 4.5" pattern, my valiant has 4" what does this mean?
Thank you all the help.

 

[core]

I final had a chance to do some measuring. The housing is 55" over all. Are all housing the same? I was told this rear end came from a 1970 duster. That is an A- body isn't it? I measured the axles from end of spline to the flange and it was almost 29". That's an axle for a B- body I think? I'm concerned that I bought a B- body 8 3/4" rear end and now I will not be able to use it.

If I can use the housing and the gears, then I can just order new axles and disc brakes from Mosor, I hope.

 

[core]

I can get the correct housing and axles from Dr.Diff for 775.00. Do you no if he carries a good product? The pumpkin that I bought with the b- body looks to be. In good shape and the seller told me that it had just been rebuilt. Will the b- body pumpkin fit into an A-body housing? If yes then should I just keep the hole set up and order new housing and axles. Or return the 8 34 b-body and start over?
Thank for your help this is very difficult to do when you have no clue what you are doing.

 

[core]

Thank for the advise. I just looked on Craigslist and some one is selling an a- body housing. I need to make sure it is the one that I need this time. I think that I will keep the pumpkin and sell the B- body housing and axles on Craigslist my self with any luck maybe I can break even.

 

[core]

I'm onto another lead, this time I have the knowledge to make sure I get the right rear end.

 

[core]

I have been looking on line for a way to use the B- body 8 3/4 rear and the 4.5" axles that I just bought. I pulled off one of the variant's tires and the rim fit onto the newly perched axle. So I believe that the valiant has the larger bolt pattern.
The different between the a body perch and the b- body perch is only 1". I have been reading about solutions for installing the b- body rear into the A- body frame . One method was just to spread the springs a 1/2" per side. It seams like a simple solution , but is it the right one? The other more reasonable on is to remove the perches and move them out the 1/2" and weld them back on.
I would like to use the b- body rear end because it should work with the brakes and wheels that I have.
Do you think this is a good road to go down or should I still hound the guy with the true a- body rear end? The a-body rear end is a small bolt pattern I believe , so would i have get new axles to fit the brakes I already have?

 

[core]

I'm going to have the welder at work handle this task. He has been welding for years. I just need to make sure everything goes back in the correct locations. Once the perches are set I can figure out the rim sizes.