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Unread 01-30-2014, 10:24 AM   #1
556hjytt78
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1980 CJ7 
 
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AMC 20 Gear Swap

Ok, I've got an AMC 20 with one piece moser axles, locker, and new brakes. It is a 2.73 ratio so I know the carrier wont work with my new 4.56 r&p's. On the jeep now is a tired AMC 20 with the proper carrier for the new r&p's. Here is my question.

Would it be easier to set up my r&p's on the axle with the proper carrier and swap everything over? Or, pull the proper carrier out and put it in the better axle? This is my first r&p set up. Im looking for the easiest way to get my shims correct


Any thoughts or suggestions?

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Unread 01-30-2014, 11:16 AM   #2
Knucklehead
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Either option will require you to do a R&P setup for the new gears so I'd suggest putting the correct carrier from you current axle into the built axlehousing with 1 piece axle shafts and new brakes (assuming the new axle is the correct width for your application).
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'45 Ford GPW; '73 CJ5, 350/NP435/D20 w/Terlow gears, locked D30/D44; '13 CJ8, 304/T150/D20/D30/AMC20 w/locker and limited slip (T18 and Teralow gears in future); '88 Dodge RC, 360/NP435/NP205/D60s
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Unread 01-30-2014, 11:23 AM   #3
556hjytt78
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I have to measure the existing shims to get me in the ballpark when I start the set up. Which shims do I measure? or do I start from scratch with the shims?
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Unread 01-30-2014, 12:53 PM   #4
Knucklehead
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Unfortunately, you are pretty much starting from scratch - two different range carriers, different housings, new gears. I'd use the shims on the "new" carrier as a ballpark but expect some work from there to get the backlash and contact pattern correct.
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'45 Ford GPW; '73 CJ5, 350/NP435/D20 w/Terlow gears, locked D30/D44; '13 CJ8, 304/T150/D20/D30/AMC20 w/locker and limited slip (T18 and Teralow gears in future); '88 Dodge RC, 360/NP435/NP205/D60s
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Unread 01-30-2014, 02:48 PM   #5
LumpyGrits
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You must do the set up in the axle housing you will be using.
Don't forget that the pinion will be marked +/- for starting reference. Mod 20 shims are on the outside of the bearings. Use the OEM set up to start with. Do a pattern check on at least 3 places on the ring gear.
LG
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Unread 01-30-2014, 03:50 PM   #6
Speedy94c
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My advise would be to find someone that has some knowledge of setting up and r&P. This is a very hard thing to do and requires close tolerances. I wouldnt want you to do it and it not get correct and mess up some $ worth of parts. Good luck with it which ever way you go.

Steve
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Unread 01-30-2014, 03:59 PM   #7
LumpyGrits
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Quote:
Originally Posted by Speedy94c View Post
My advise would be to find someone that has some knowledge of setting up and r&P. This is a very hard thing to do and requires close tolerances. I wouldnt want you to do it and it not get correct and mess up some $ worth of parts. Good luck with it which ever way you go.

Steve
Good advice.
Special tools needed for R&P work. Inch-pound and foot-pound torque wrench, and a dial indicator that will measure down to .001".
Along with a bearing puller and press.
LG
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Unread 01-30-2014, 06:02 PM   #8
556hjytt78
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I've got a dial indicator and inch/lb torque wrench. My buddy has set them up before. He will be on standby. Thanks for the input guys.
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Unread 01-30-2014, 07:42 PM   #9
LumpyGrits
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You will need a foot/lb. torque wrench for the bolts. Red Loc-tite for the ring gear bolts.
The inch pound is for check'n pinion bearing preload.
Also, get a 0-1" micrometer for measuring the shim's thickness.
Good luck,
LG
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