swapping amc 20's

[slappy]

i have a 85 cj AMC20 with 4.56 gears and a detroit. i found a cheap 80's waggy AMC20 . are the gears and detroit interchangable between these axles?

 

[CJim7]

i have a 85 cj AMC20 with 4.56 gears and a detroit. i found a cheap 80's waggy AMC20 . are the gears and detroit interchangable between these axles?

Im going to go out on a limb and say I believe they are. The big difference between CJ and Waggy 20's is the wall thickness of the axle tubes. But I think everything in the pumpkin is the same.

 

[slappy]

that's why i want to go with the waggy AMC20 because of the tube thickness and it already has one piece axles. i was hoping i wouldn't have to buy another detroit, those things aren't cheap. thanks for the reply.

 

[Sasquach]

Do a little part no. shopping for each model vehicle and see if they show the same part no. Detroit or not.

 

[shays4me]

One thing to remember is that none of your brake hardware will swap. You probably aren't going to swap it, but I thought I'd mention it. I was out measuring my HD20 last night and I noted the brake backing plate bolt pattern is larger on the Waggy axle than a CJ. I wanted to chop it and set it up with my Warn full float axle kit, but it doesn't look like I can do it economically, since the Warn axle kit relies on the CJ axle flange/bearing bore for mounting and sealing. It's really a bummer for me. I was looking forward to the tougher tubes.

 

[shays4me]

that's why i want to go with the waggy AMC20 because of the tube thickness and it already has one piece axles. i was hoping i wouldn't have to buy another detroit, those things aren't cheap. thanks for the reply.

Oh, and yes they will! That was my plan.

 

[BusaDave9]

Im going to go out on a limb and say I believe they are. The big difference between CJ and Waggy 20's is the wall thickness of the axle tubes. But I think everything in the pumpkin is the same.

I was going to agree with CJim7. I am pretty sure the differentials are the same.
Then I saw what Sasquach had to say. He's being logical and wants you to double check the facts. Can't argue with that.

Do a little part no. shopping for each model vehicle and see if they show the same part no. Detroit or not.

 

[CJim7]

I was going to agree with CJim7. I am pretty sure the differentials are the same.
Then I saw what Sasquach had to say. He's being logical and wants you to double check the facts. Can't argue with that.

Absolutely. It's always a good idea.

 

[Rescue Diver]

What's the difference in width between a CJ and waggy AMC20 ????

What about the spring perches?

 

[slappy]

i think the waggy is about 3 inches wider if i remember and the spring perches will have to be moved in which gives me chance to correct pinion angle without using shims.

i will check those part numbers.

thanks everyone for your replies.

 

[shays4me]

What's the difference in width between a CJ and waggy AMC20 ????

What about the spring perches?

My CJ rear axle is a wide track at 54.5". Narrow track CJ is 50.5". Narrow track Wagoneer is 57.5". I'm not sure about wide track FSJ, I just know it's too wide for my application. This is a cool site. The New Jeep Tech Pages

 

[BrockGrimes]

My CJ rear axle is a wide track at 54.5". Narrow track CJ is 50.5". Narrow track Wagoneer is 57.5". I'm not sure about wide track FSJ, I just know it's too wide for my application. This is a cool site. The New Jeep Tech Pages

You referenced a good idea but placed a generic link.
Did you mean this page:
Jeep Tech: Axles

 

[shays4me]

You referenced a good idea but placed a generic link.
Did you mean this page:
Jeep Tech: Axles

Yes, I was just linking the website. There's a ton of good info on there.