AMC 20

[derf]

Found at a salvage yard under an 86 Comanche.  The speedo was shot so there's no telling what the true mileage is.

 

I will get more pictures tomorrow and post them, including taking off the cover and verifying the gear ratio and condition of the gears.

 

I'm going to toss out $500 as an initial asking price but may adjust that based on what I find.  And cash always talks to me so it's always "or best offer".

 

The spring plates will come with it.  One U-bolt didn't survive extraction and we left the other 3.  Parking brake cables were extracted intact and come with the axle.  They couldn't be tested.

 

Axle is located in Castle Rock, CO 80108, just south of Denver.  Local pickup preferred.  I might be able to ship it on your dime.

[89 MJ]

In case anyone doesn’t know, this rear axle has very comparable strength to an MJ D44, but is rarer as it is 86 only. 

[eaglescout526]

Do you happen to know the ratio of it?

[derf]

18 minutes ago, eaglescout526 said:

Do you happen to know the ratio of it?

I will in the morning.

[Pete M]

should be 4.10.   

[89 MJ]

Gosh, if it’s 4.10 gearing (who knows because it’s 86 ) it would be great for someone building an overland rig or someone who does towing. 

[Pete M]

in 22 years I've only ever seen 4.10s in an MJ AMC-20.  car-part.com even lists it as the only option for the 20.    yes, technically anything is possible, but it's a safe bet.  

[eaglescout526]

Ohhh if its 4.10 I would be very very tempted to do it. 

[ghetdjc320]

2 hours ago, 89 MJ said:

In case anyone doesn’t know, this rear axle has very comparable strength to an MJ D44, but is rarer as it is 86 only. 

AMC 20’s arent really all that rare. They were found in many other Jeep vehicles like CJ’s, Wagoneers etc. Decent aftermarket support but not nearly as much as a 44. They may be less common in MJ’s but 86 was the highest production year for MJs also. 

[derf]

You got me curious.

 

One of the [CENSORED] torx bolts didn't want to come out so that will be an adventure.

 

But I counted teeth.  It is indeed a 4.10 axle (41/10) with an open differential.

 

 

[derf]

Passenger side parking brake cable is shot.

 

 

[eaglescout526]

That would be a bolt in upgrade for me. Freight would not be fun for that thing to figure out. 

[derf]

We could always meet in Santa Fe or Albuquerque.

[ghetdjc320]

Fastenal ships axles on pallets for about $100-150. Sent a few that way in the past. Also, if you can get it below 150lbs just wrap it in plastic and ship fedex ground. Very economical and they’ll even pick it up

[89 MJ]

8 hours ago, ghetdjc320 said:

AMC 20’s arent really all that rare. They were found in many other Jeep vehicles like CJ’s, Wagoneers etc. Decent aftermarket support but not nearly as much as a 44. They may be less common in MJ’s but 86 was the highest production year for MJs also. 

Yes, I should have specified more. I didn’t know that 86 was the highest production year for the MJ. Interesting. 

[Pete M]

10 hours ago, derf said:

You got me curious.

 

One of the [CENSORED] torx bolts didn't want to come out so that will be an adventure.

 

But I counted teeth.  It is indeed a 4.10 axle (41/10) with an open differential.

 

 

you could have simply rotated the axle shaft and counted pinion rotations.  

[derf]

56 minutes ago, Pete M said:

 

you could have simply rotated the axle shaft and counted pinion rotations.  

I still needed to inspect it and maybe do some maintenance.

[The86manche]

12 hours ago, ghetdjc320 said:

AMC 20’s arent really all that rare. They were found in many other Jeep vehicles like CJ’s, Wagoneers etc. Decent aftermarket support but not nearly as much as a 44. They may be less common in MJ’s but 86 was the highest production year for MJs also. 

Very true but the cj 20 axle was a split shaft design from what ive read. Where mj 20s were a solid shaft design making it stronger.

Ive also not seen a lot of 20 axles. A few cjs but nothing ive actually seen in person. Ive seen far more 44 axles. Even under mjs 

[89 MJ]

15 hours ago, eaglescout526 said:

That would be a bolt in upgrade for me. Freight would not be fun for that thing to figure out. 

You know you want it. But money doesn’t grow on trees. Road trip!

[jdog]

yeah its not like we are all the way on the east coast

[eaglescout526]

I know but I don't know how soon derf wants it gone. 

[derf]

24 minutes ago, eaglescout526 said:

I know but I don't know how soon derf wants it gone. 

I can hang onto it for a while.

[eaglescout526]

I might be able to work something out then on one of my three day weekends. Obviously now is a terrible time.

[ghetdjc320]

6 hours ago, The86manche said:

Very true but the cj 20 axle was a split shaft design from what ive read. Where mj 20s were a solid shaft design making it stronger.

Ive also not seen a lot of 20 axles. A few cjs but nothing ive actually seen in person. Ive seen far more 44 axles. Even under mjs 

The V8 Wagoneers were also solid shaft amc 20’s, seen lots of the personally. Was looking for a Dana 44 rear in one but all I found were 20’s. CJ’ with V8s and many V8 amc vehicle had them too. Not bad axles but not unicorns. It is odd that they went from an amc 20 to a Dana 35. That’s a pretty big strength gap there.