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post #1 of (permalink) Old 06-27-2001, 11:38 PM Thread Starter
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Hummer with AMC 20 rear?

I read a post a couple of days ago on another board where there was a guy talking about getting a Hummer and changing the gearing. On one of the replies a guy said it was easy, because the Hummer uses an AMC 20 rear end and listed the correct ring gear size for an AMC. Now maybe I'm confused, but I think this guy is a little mis-informed.

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post #2 of (permalink) Old 06-27-2001, 11:42 PM
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Re: Hummer with AMC 20 rear?

More than just a little. Last time I checked the M20 was not an independent setup with halfshafts, inboard discs, and geared hubs!!

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post #3 of (permalink) Old 06-27-2001, 11:54 PM
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Re: Hummer with AMC 20 rear?

Nope, I believe the guy was right. I read once that the center section is an AMC Model 20. Don't forget where the Hummer finds its roots. AMGeneral was the military manufacturing branch of AMC until it broke off. For some fun, take a front pic of a CJ and stretch it wider and you will have a Hummer!

The Independent suspension and geared hubs are new, but the carrier is designed around the AMC Model 20 axle!

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post #4 of (permalink) Old 06-28-2001, 04:45 AM
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Re: Hummer with AMC 20 rear?

i heard that too. and all us jeepers thought amc cursed us with that rear 20...alls we needs is some halfshafts, inboard discs, an a trick hub gear system and we'd have the great 4 inches of atriculation a hummer has

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post #5 of (permalink) Old 06-28-2001, 05:23 AM
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Re: Hummer with AMC 20 rear?

it has been interesting to watch the hummer go from ultimate offroad to id take a well modified straight axle anyday


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post #6 of (permalink) Old 06-28-2001, 07:52 AM
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Re: Hummer with AMC 20 rear?

Yes, the Hummer has a M20 center section. However...there is a difference in the center section. I don't remember what it is, but you can't just slap another AMC R&P into it. I know we covered it here, do a search.

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post #7 of (permalink) Old 06-28-2001, 08:45 AM
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Re: Hummer with AMC 20 rear?

Yep, the Hummer does use the AMC20 R&P in the pumpkin. However, remember also that the Hummer has Portal axles. These axles let all the torque be expended at the wheel, not the R&P. So you can have a smaller center section and still apply massive amounts of toque to the wheels.

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post #8 of (permalink) Old 06-28-2001, 01:44 PM Thread Starter
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Re: Hummer with AMC 20 rear?

That is what I thought might be the case (AMC20 center section),but the post I read made it sound like he was talking about the rear axle. He might have even said rear axle, wish I had copied it. I guess we were both a little misinformed.

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