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AMC20 re-gear

#1 User is offline   sgt1022 

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Posted 24 September 2011 - 10:30 PM

I'm planning to re-gear my AMC20 from 3.08 to 4.10. I will be checking backlash and contact patterns. My question is, in everyones experience, would the same shim amount be used on the carrier for the 4.10's as the 3.08's?

#2 User is offline   Jim B 

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Posted 26 September 2011 - 08:01 AM

From my understanding every time you re gear especially with new carrier checking backlash and contact patterns is the right way to go as you mentioned you were going to do. I would not use the same shim amount, yes by coincidence it could take the same but I would not chance it.
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#3 User is offline   Big Red One 

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Posted 26 September 2011 - 08:55 AM

I can't remember where the 'Case Break' is on your diff, I don't think they make a 'THICK' gear set for the 20, once you go past a certain higher ratio the pinion head diameter gets smaller to the point you need a thicker ring gear OR a different carrier in the pumpkin. I would look into that :scratch: , you may need a different carrier to run 4.10's, undamaged shims can be reused, it's the thickness of the shim pack that will change, I would get a rebuild kit, the Master Kits come with carrier bearings as well as all the shims you'll need.
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#4 User is offline   sgt1022 

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Posted 26 September 2011 - 03:18 PM

Thanks guys. According to my research if you have less that 3.08 and going higher you would need to change carriers. I dont need to change carriers to go to 4.10's since i have 3.08's. I planned on installing a master kit. Might as well get new stuff in there while I'm at it.

#5 User is offline   JeepinIan 

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Posted 16 October 2011 - 01:55 PM

Get yourself a spare bearing set of the same manufacturer as the bearings you are going to use. Have the inside diameter honed for a fit that you can install by hand, snug not a press fit. Start out with the same amount of shims, check the backlash and pattern, and adjust from there. Once you have the correct shim pack, press the permamanent bearing on. Be prepared to spend the day getting it right.
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#6 User is offline   XrayDivr 

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Posted 16 October 2011 - 05:58 PM

my 2 cents, but thats a lot of work for such a small gear change, make sure your going deep enough to make yourself happy, otherwise your gonna find yourself doing it all again later, when you decide you should've had 4:56 or even 5:11's, you can do the math if you want i think you set up a ratio, like stock tire size over stock gear ratio equals new tire size over x
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#7 User is offline   sgt1022 

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Posted 16 October 2011 - 10:35 PM

do i need to use new bearings. could i use the old ones if they arew still good?

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