Tubes, CJ AMC 20 vs FSJ AMC 20

Sundowners · 10-23-2009, 02:06 PM

Does anyone know the actual size of the axle tubes that Jeep used on the FSJ AMC 20? I have heard that they are bigger than the CJ AMC 20 but I could not find any actual numbers? I'm looking for the dia and wall thickness of the tubes of the FSJ AMC 20 and the CJ AMC 20 so I can compare the two.

Thanks,
Brian

**78treehugger** · 10-24-2009, 10:33 PM

Not sure of the diameter but I believe they are the same diameter just that the FSJ is a thicker wall.

tahoe wheelers · 10-25-2009, 08:16 AM

Dont know the diameters either, but the AMC 20 FSJ comes with factory one piece axles and will also be a 6 lug bolt pattern.

Sundowners · 10-27-2009, 12:24 PM

Thanks guys, It would make more sense that they were the same OD just different walls, That way they (AMC) only has to have one pumpkin casting.

B

**PavementPounder** · 10-27-2009, 12:55 PM

They aren't the same OD. The FSJ 20 has the same OD as the FSJ D44. The FSJ housing also has the tubes pressed-in farther. I believe I still have one of each housing and both have been gutted, so I may be able to get them both over to the chop saw at the shop to get some real numbers.

Sundowners · 10-27-2009, 01:23 PM

Quote:

Originally Posted by PavementPounder

They aren't the same OD. The FSJ 20 has the same OD as the FSJ D44. The FSJ housing also has the tubes pressed-in farther. I believe I still have one of each housing and both have been gutted, so I may be able to get them both over to the chop saw at the shop to get some real numbers.

Thanks PavementPounder, Always a big help!

Thanks,
B

sdozzi · 11-18-2009, 12:45 PM

The FSJ AMC 20 has a diameter of 2.75" it is the same as the model 44 on a FSJ. The U bolts from a CJ will not work on the FSJ axle. Can't get the wall thickness but I do know the axle shafts are different. If you try to put CJ axles in the FSJ AMC 20 you need different size bearings. Also the bolt pattern that holdes the backing plate on are different. It is a stronger axle then the stock CJ.

CSP · 11-18-2009, 12:56 PM

Quote:

Originally Posted by sdozzi

The FSJ AMC 20 has a diameter of 2.75" it is the same as the model 44 on a FSJ.

Wish I had seen this thread earlier. This number ^^^^^ is correct. The CJ version is 2-5/8".

10-25-2009, 08:16 AM	#3
tahoe wheelers Registered User Join Date: May 2005 Location: Greater Lake Tahoe Area Posts: 994 Profile Gallery Classifieds My Jeeps	Dont know the diameters either, but the AMC 20 FSJ comes with factory one piece axles and will also be a 6 lug bolt pattern. __________________ 1985 cj 7. 360 V8, 35X12.50 BFG's sitting on Crager 15X8 rims, summer brothers axle rear, Yukon axles up front, lock rite lockers front and rear, 5" of lift, body armor, six point roll cage, 8000lb warn winch, 4.56 yukon gears front and rear, t-18, dana 300. And much more on the way. www.therockgods.com www.reno4x4.com

10-27-2009, 12:55 PM	#5
PavementPounder Cool as Ice... Join Date: Dec 2006 Location: Sterling Heights, Michigan Posts: 2,727 Profile Gallery Classifieds My Jeeps	They aren't the same OD. The FSJ 20 has the same OD as the FSJ D44. The FSJ housing also has the tubes pressed-in farther. I believe I still have one of each housing and both have been gutted, so I may be able to get them both over to the chop saw at the shop to get some real numbers. __________________ This is how NAXJA Midwest Chapter elected officials like to treat their resident users and former multi-year supporters. <--- Click "Classifieds" under my avatar to see all my parts (mostly CJ & XJ) currently for sale on JeepForum!