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model 20 answers

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1970390amx View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 1970390amx Quote  Post ReplyReply Direct Link To This Post Posted: Nov/05/2010 at 12:58am
I had a question about moser axle lenght and the engaugement into the spider gears. My housing is about 52.5 flange to flange and the axles are 24 and 26.5 from the end to the step formed to locate the axle bearing. Picture shows both axles need to go into housing a small amount. At this time they are bottomed against the rubbing block that would need to be removed to run moser axles. I still have not made a decision on what axles to run. I will most likely show both installations.
1970 390 4speed Bittersweet shadow mask AMX
1970 Amx missing most everything, or in a box
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Post Options Post Options   Thanks (0) Thanks(0)   Quote billd Quote  Post ReplyReply Direct Link To This Post Posted: Nov/05/2010 at 6:04am
Showing both would be nice - some of us run stock, some don't.......

We used the spreader. Also had them in college when we spent a good chunk of the quarter on differentials and setup. Doesn't take a lot of force to spread it the small amount needed to get the carrier in. Some folks simply beat the shims into place, too. Besides preload on the carrier bearings, the shims also are what you use to shift the carrier left or right for the backlash, etc. but I see you getting into that later ;-)


Edited by billd - Nov/05/2010 at 6:04am
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 1970390amx Quote  Post ReplyReply Direct Link To This Post Posted: Nov/06/2010 at 12:57am
The yoke is a tight fit through the front bearing and yoke, I back off the nut and use a air hammer with a rounded bit to push it out.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 1970390amx Quote  Post ReplyReply Direct Link To This Post Posted: Nov/06/2010 at 1:01am

At this point your diff is about as torn down as it will go.  I never had the chance to drive this diff so I spent extra time checking it out on tear down.  You should have an idea what was wrong with your diff at this point, most will be replacing the bearings and maybe a ratio change, or adding a twin grip. 

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Post Options Post Options   Thanks (0) Thanks(0)   Quote 1970390amx Quote  Post ReplyReply Direct Link To This Post Posted: Nov/06/2010 at 1:08am
If you are reusing the ring and pinnion or carrier or useing used parts you will need to remove bearings. There are several ways to do this including several diffent pullers or cutting them off. This is a picture of a puller designed to pull pinnion and carrier bearings without damageing them.

Edited by 1970390amx - Nov/06/2010 at 1:13am
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 1970390amx Quote  Post ReplyReply Direct Link To This Post Posted: Nov/06/2010 at 1:13am
Other special tools you will need include:
hub puller
torque wrenches
micometer or caliper
dial indicater Mine is a magnetic base and billd's shown earlier is a clamp on base, not sure with is better
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 1970390amx Quote  Post ReplyReply Direct Link To This Post Posted: Nov/06/2010 at 11:22am
If you are looking for used parts all the carriers for AMC are the same with ratios 2.87 and lower. Shown on the left is a oddball carrier fo the 2.73 ratio. The flange the ring gear bolts to is in a different position. You cant get the backlash correct if you tried to use it on other ratios.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 1970390amx Quote  Post ReplyReply Direct Link To This Post Posted: Nov/06/2010 at 11:41am
This shows how to set up dial indicater to check carrier bearing preload. Use a set of shims that allow the carrier to slide in with no effort and install main caps finger tight. Using a pry bar, pry carrier left and right to seat bearing races in the housing. Then tighten caps with wrench. Pry the carrier to one side and zero the indiater, then pry the the carrier to the other side and read the indicator. The amount read is what is needed to be added to shims to achieve zero preload. Dont zero the indicator or read it while prying. Its a good idea to lightly run a file over the drve gear flange, this will remove any nicks or high spots. Once you have adjusted to zero preload set the indicater to zero again and spin the carrier watching the dial. This checks for runout, in a perfect world it should be zero. Up to .002 is ok.  
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 1970390amx Quote  Post ReplyReply Direct Link To This Post Posted: Nov/10/2010 at 1:36am
yea, new parts
bearing kit with crush sleeve and pinnion seal, New pinnion nut is wrong thread pitch coat about 100$ also got two outer axle seals about 30$ already had inner axle seals and axle bearings.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 1970390amx Quote  Post ReplyReply Direct Link To This Post Posted: Nov/10/2010 at 1:43am

I used an aluminum driver to install the front and rear bearing race's. Also shown is the shim for pinnion depth, it installs under the rear pinnion race. I have found that inorder to get the old race out you must drive against this shim and they seem to be brittle and easy to damage. I ground the four small notches in the shim shown to help in removal if pinnion depth is wrong.
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