'74 Scamp rear diff needs- Which in should I get?

[72chargerguy]

I am building a '74 Scamp and I will have a 550-600 hp 383 under the hood with 727 behind it. Obviously, the stocker (7 1/4) isn't going to cut it. What rear should I use? I have the following-

Truck 9"
GM A-body 8.5" 10-bolt

I would prefer Mopar, but D60s are not cheap and hard to find around here.

 

[pettybludart]

A 8 3/4 A-body rear is what you need,also can use a B-body rear(a little wider,but will work)GM?Unless a 12 bolt,you,d be wasting time.My 2 pesos

P.S If your stuck for 1,you could use a ford 9 inch.

 

[72chargerguy]

The GM 8.5" 10-bolt is just as strong as the 12-bolt and more plentiful, I just don't want to use it as I have plans for it already.

 

[pettybludart]

The GM 8.5" 10-bolt is just as strong as the 12-bolt and more plentiful, I just don't want to use it as I have plans for it already.

You seem to know enough,so bolt the 10 inch in?

 

[72chargerguy]

Like I said, I have plans for the 10-bolt and I want to keep it Mopar. Will the 8 3\4 live behind that much power with the possible addition of 200 hp worth of nitrous? I know Ford and GM rears, but I don't know jack about mopars! This was my question, what would live behind 550-600 hp from the mopar offerings and what would be a simple\cheap build and easy to find. I really don't want to narrow it if I don't have to. I am doing ladder bars, tubs and a 10-point cage with 10-inch slicks. 15x10 wheels with 5" backspacing. The car is in the weeds so getting out there and measuring it is not easy right now.

 

[cosgig]

Lets see, the 8 3/4 came standard behind Max Wedge, Hemi super stock automatic cars and almost every high performance application Mopar was making, I think it could be made to live behind your set-up. Heck, even the early 8 3/4's with the keywayed drums came behind Hemi cars. Yea, a Dana would be nice, but the 8 3/4 will do just fine. Good luck with your project, Geof

 

[crackedback]

Footbraking it may do ok, transrake, no chance, it'll blow up.

Starting from scratch, don't have an 8.75 or Dana, get a Dana.

 

[72ScampTramp]

I went dana for this reason. I wanted the added peice of mind. I found my Dana 60 truck rear end for 60 bucks. With a power lock and the right gears I wanted. There out there. Maybe not at that price but there out there. Most likely your donor will be a truck. I hunted till I found one with the gears and posi less money to fork out later. Just remember to factor in cost. If your worried that the 8 3/4 wont hold up there is no way a chebby 10 bolt will.

 

[bumnround]

Johnnycuda has a dana for sale