Sir Sam Posted February 5, 2009 Share Posted February 5, 2009 I've never heard anything bad about it, seems decent enough, other than a lack of aftermarket support(compared to the 44), so why is the AMC20 desireable for a MJ? Also, whats the WMS to WMS of a MJ AMC20? Link to comment Share on other sites More sharing options...
Pete M Posted February 5, 2009 Share Posted February 5, 2009 Why do I like mine? It's rare, it's strong, it bolts right in. :D It is the same width as any other MJ rear axle. Link to comment Share on other sites More sharing options...
BLHTAZ Posted February 5, 2009 Share Posted February 5, 2009 It depends on the AMC20 that you get too. Yes, there are bolt-ins from MJ's that you can get, but there are many other sources for them too. The best one to get would be out of an early 80's Wagoneer (FSJ) as they have the strongest housing to go along with the strong shafts that the 20 has. In most all cases the AMC 20 is stronger than a D44 and just short of, but close to a D60 (if from the FSJ). The wide track CJ's had decent 20 under them too, but need to be converted from the two piece design to a one piece shaft to get the most strength out of them. The FSJ & CJ versions are very similar in length to the MJ, but the FSJ is a 6 on 5.5 bolt pattern and the CJ is a 5 on 5.5 There are plenty of things out there for them now too. I have found disc brake conversion kits, all kinds of lockers, gears etc, etc... There may not be the wide range in some things as there is for the Dana axles, but if you look a bit you will find plenty. :cheers: Link to comment Share on other sites More sharing options...
jtdesigns Posted February 5, 2009 Share Posted February 5, 2009 Well I said this before,, but the AMC20 I had in my 78 CJ was a POS.... Well my main gripe was with the two piece axle shafts... I spun two of them on the hubs.. I was running 15/35-15 super swampers though, with a bowtie 289 V8 powerpack motor .. Not only did I spin those hubs, but also ruined a chrome Cragar super star when a lug nut spun in the hub.. Only way to remove it was cut the lug nut off.. :rant: :fs1: :headpop: This was in 94, and I still have parts off that Jeep scattered in the barn.... If anyone ever gets a AMC20............. Better make d@nmed sure to put one piece axles in that SOB... Link to comment Share on other sites More sharing options...
89eliminator Posted February 5, 2009 Share Posted February 5, 2009 didnt all MJ AMC 20s come with 1-piece shafts? Link to comment Share on other sites More sharing options...
jtdesigns Posted February 5, 2009 Share Posted February 5, 2009 didnt all MJ AMC 20s come with 1-piece shafts? Not mine.. Link to comment Share on other sites More sharing options...
LEAD_NOT_FOLLOW Posted February 5, 2009 Share Posted February 5, 2009 didnt all MJ AMC 20s come with 1-piece shafts? Yes all the 20's in the MJ's were a 1 piece shaft. That is the specific reason that they are a desirable axle as compared to the CJ or FSJ 20's. A solid 1 piece shaft conversion kit is expensive, so it's a plus that the axle already has it. Plus many (including myself) say that it's a stronger axle than the D44 is. The non MJ AMC20's are an OK axle, they just take alot of work to resolve some of the issues with heavy wheeling. The MJ version is essentially the solution to those problems, thus not taking much work to make a killer axle... Link to comment Share on other sites More sharing options...
BLHTAZ Posted February 5, 2009 Share Posted February 5, 2009 The FSJ 20 is the strongest of them all. It comes with one piece shafts and the housing is thicker and stronger than any ofthe other AMC20's thus making it hte most desired of the 20's to chosse from. Link to comment Share on other sites More sharing options...
Eagle Posted February 5, 2009 Share Posted February 5, 2009 didnt all MJ AMC 20s come with 1-piece shafts? Yes Link to comment Share on other sites More sharing options...
Eagle Posted February 5, 2009 Share Posted February 5, 2009 didnt all MJ AMC 20s come with 1-piece shafts? Not mine.. You said yours was a CJ. The CJ model 20 axle did not have one-piece shafts. The MJ/XJ model 20 axle did. Link to comment Share on other sites More sharing options...
JeepcoMJ Posted February 5, 2009 Share Posted February 5, 2009 didnt all MJ AMC 20s come with 1-piece shafts? Not mine.. You said yours was a CJ. The CJ model 20 axle did not have one-piece shafts. The MJ/XJ model 20 axle did. amc20's were never offered in xj's. it was a one year wonder in the 86 comanches. Link to comment Share on other sites More sharing options...
jtdesigns Posted February 6, 2009 Share Posted February 6, 2009 didnt all MJ AMC 20s come with 1-piece shafts? Not mine.. You said yours was a CJ. The CJ model 20 axle did not have one-piece shafts. The MJ/XJ model 20 axle did. Right... My CJ.. I didnt read MJ. I'm glad the MJ's came with one piece axles.. I hate for any of my Comanche Brethren to deal with those two piece craps. But,, its not like every Comanche has them.. Link to comment Share on other sites More sharing options...
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