1964 Rear end swap.

[Steve C 1964]

I have a 1964 swb Step side. It has a 3:73 rear end (6 Lug).
I want to keep it 6 lug but would like to put one in from a lter model. I have saw on here that a 73 to 87 rear end is 1.5 inches wider. I was wondering if a 4x4 rear would be that same 1.5 inches wider or are they different.
Any help would be great.

 

[kieth]

Why don't you just chang the gears out in your rear end, at the same time add a posi trac center section. What gears do you want to run ?

 

[Steve C 1964]

I have a thottle body injected 350 with 700 R4 trans. The 1964 rear has 3:73 gears that have some wear. I assume the rest of the parts in the rear are worn also. I want to put 3:48 gears just to reduce the RPM of the engine. With a later model axel it might not have as much wear on it.

 

[drabo]

You can do a couple things. If you want to go to 3:43 then you will either have to change the carrier or shim the carrier. I would go with a whole new carrier. Shimming is not as strong and could fail. These rear ends a typically good up to 400 HP and adding shims does weaken it. If you go with an 80's rear end then you will have to add a panhard bar adaptor to it and the rear wheels could rub. One from the 90s is alot wider and will definatly rub. http://www.ringpinion.com/

 

[kieth]

I have a thottle body injected 350 with 700 R4 trans. The 1964 rear has 3:73 gears that have some wear. I assume the rest of the parts in the rear are worn also. I want to put 3:48 gears just to reduce the RPM of the engine. With a later model axel it might not have as much wear on it.

What rpm and speed are you wanting to cruise at ? What is the diameter of your tire and wheel combo ? Let me know and we will try and figure it out. with my 30" tires and a 3:73 I am turning 68 mph at 2000 rpm. The change to 3:42s would be expensive for me and not really do that much good. So I stayed with the 3:73...... Kieth

ps I have a 350tbi 700r4 combo.....