AMC 20

[MJ88User]

I found an AMC 20 (I hope, it looks like one to me) under a 86 MJ XLT longbed out in the local yard to replace the Dana 35 mine has now, got the whole rear end, leaf springs and every thing for $200.

 

Can any of the Guru's on the board confirm that this is a 3.55 ratio from the markings on the back of the diff? I have read in various places the big 'N' might be 3.55 and a trac-lock, or am I looking in the wrong place?

Sorry about the cell phone picture as you try to diagnose this.

 

 

 

Thanks a bunch if anyone can confirm these suspicion's of mine.

Do any of you suggest I go back and pick up anything else for this to fit perfect, or do I have the most important stuff? Oh yea the drive shaft had been bent when they put it in the yard so I'll have to wing it there.

 

Thanks again

Andy

[Pete M]

Gear ratio should be on a tag bolted to the cover.

[87manche]

nice score on the 20

if the ratio tag is missing you can look at the ring gear in the diff, should be stamped on there.

might e two numbers, one is ring gear teeth, on is pinion, divide to get the ratio.

[MJ88User]

Thanks Pete M & 87manche, I saw no tag so I guess I'll have to open up if i can't figure it out by turns.

 

Andy

[Eagle]

Do you know what engine and transmission were in the truck? It seems unlikely that it would have been a 3.55. That ratio was used only behind early 4-cylinder 4-speeds. It's more likely to be a 3.73 or a 4.10. (I think).

[carnuck]

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Look for letter stamps around the "hole" in the axle housing. That's how AMC lists their axle ratios.

[mjeff87]

Ideally, you'd want to pull the cover and inspect the guts, as well as change the fluid, so check then :D

 

Jeff

[MJ88User]

Eagle

It was from a V6 2.8L I didn't look at the Trans real close so I'm no help there.

 

carnuck

I will look for the stampings when i clean off the years of stuff maybe this weekend, I'm hoping that i find something.

 

Most likely what mjeff87 said willl happen, when time is avalible so this might just be the way i find out for absolutly sure.

 

Thanks all for the info

Andy