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Old 05-05-2013, 03:16 PM
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'62GMC PU rear end gears

I've got a '62GMC PU which I just inherited.

The plan is to swap out the 305V6 with a spun crank bearing and drop in a 250/Powerglide from a '68 Nova 4-door.

I'd like to know if different gears are available to make the original rear-end more street and highway friendly.

Also, where can I get them from?

If there isn't any to use with the original rear-end, can anyone suggest a different rear to use that would go in fairly painlessly?

I want to keep the "original" look that dad had it. So I want to keep the 6 hole lug rims.

I'd appreciate any info or advice. Dad always said that if you don't know about something, go ask somebody who does. That's why I'm here.

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Old 05-05-2013, 03:19 PM
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62 GMC

Hi, it's been a while since this threads been touched, but I'd like to know how it turned out. I recently inherited my dads '62 and and am wanting to do so upgrades.

I've got a couple other posts on here about it too.
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Old 05-05-2013, 03:58 PM
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Originally Posted by ancientx View Post
Hi, it's been a while since this threads been touched, but I'd like to know how it turned out. I recently inherited my dads '62 and and am wanting to do so upgrades.

I've got a couple other posts on here about it too.
Welcome to Hotrodders.

You posted to an old thread. That member had not logged in for years, there may be no answer from him.

I merged your posts here, so there is a new thread on an old question.

Good luck
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Old 05-06-2013, 08:43 AM
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GMC and Chevy will have used the same axle, you can find six lug up yo 1970 on all GMC and chevy trucks, after that only on 4x4, the GMC used leaf springs in most cases but had the option for coils, if you choose the chevy axle most cases will be coil springs but they also had the option for leaf springs, later model both GMC and chevy `68 to 70 had a little friendlier axle ratios, this will be a wrecking yard hunt or craiglist, if you find a chevy axle, you will have to have sping pads welded on for your GMC...
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Old 05-06-2013, 02:31 PM
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Originally Posted by Rick 5150 69 View Post
GMC and Chevy will have used the same axle, you can find six lug up yo 1970 on all GMC and chevy trucks, after that only on 4x4, the GMC used leaf springs in most cases but had the option for coils, if you choose the chevy axle most cases will be coil springs but they also had the option for leaf springs, later model both GMC and chevy `68 to 70 had a little friendlier axle ratios, this will be a wrecking yard hunt or craiglist, if you find a chevy axle, you will have to have sping pads welded on for your GMC...
Thanks. I guess the original owner got the coil spring option. I know dad didn't put them on.
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Old 05-06-2013, 03:31 PM
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Originally Posted by ancientx View Post
I guess the original owner got the coil spring option. I know dad didn't put them on.
Not on?

You'll have either large coils with stamped-steel arms that go forward diagonally from the axle to a crossmember (plus a panhard rod)...or a pair of front-to-back leaf springs...they are two totally different suspension types.

The live axles can be interchanged between the two types with a little creativity.

'70s 1/2-ton 4x4s will have a "truck 12-bolt" rear with six lugs and usually 3.73 gears, that maybe you can use. In the eighties you'll likely find 2.73s and there are Blazers everywhere with those rears if you can deal with that tall of a gear. There are late-eighties-and-up 9 1/2" rears that came in something called a HD half-ton or conversely a light-duty 3/4-ton, that are tougher and had 6-lug c-clip axles, but hard to find and you're usually back to 3.73 or 4.11.
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