1962 GMC 305V6 4WD Slow DD Build - Cecilia (Pic Heavy)

[bigblockv6]

Looking at the pic of the ring gear numbers I see 47-12 not 4/-12

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So you take 47 divided by 12= 3.91666, in other words you have the 3.92 ratio. That's a real good ratio for a 4wd half ton

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[Ed Snyder]

Originally Posted by bigblockv6

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Looking at the pic of the ring gear numbers I see 47-12 not 4/-12

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So you take 47 divided by 12= 3.91666, in other words you have the 3.92 ratio. That's a real good ratio for a 4wd half ton

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3.92 was the standard ratio for the 4x4s in 1962. That's what my Suburban came from the factory with. It's got 3.54s in it now.

[bigblockv6]

Ed, actually the 3.54 was the standard ratio on 4wd models in 62, my father's 62 K1000 had 3.54 gears so the 3.92 was optional

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[TJ's GMC]

3.92.....seems I've heard of those. Were they are special order? Or was that standard on a 4x4?

Looks like a new rack and pinion are in store!

[bigblockv6]

The 3.92 were optional on 4wd models, most came with the 3.54 ratio.

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[TJ's GMC]

Originally Posted by bigblockv6

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The 3.92 were optional on 4wd models, most came with the 3.54 ratio.

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Little steep for towing, but it sure sounds nice! haha!

[bigblockv6]

The good thing about having 3.92 gears is you could install larger diameter tires without compromising much of a power loss

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[Charon]

So Pep. Now two different problems to sort out. The second gear jumping out. And the nice looking d44 . don't feel bad. That rear problem is common on that rear in a truck. So first. The problems with the peanut. Two things most likely. Second gear coupling gear is worn. Or input shaft bearing is wonky. Now I don't remember what bearing you used. But the new replacement bearing for the 318 is not the same depth. Its .040 less. This causes the whole thing to move in and out. Probably this is what that knock you hear is from. So that's my educated guess. The rear. Well time for that powerlok upgrade. And a new ring and pinion.

[Charon]

Oh the trials and tribulations of poor Cecilia. Now I for to thinking. Hmmmm I said. I parted out a few 63 gmc 4x4 trucks back in the day. Sadly better trucks than yours. But they are just trucks. So me being the absolute truck parts hoarder. Went and looked in the gear box garage. Now all sorts of gears go there. Hundreds of gears. Transmission gears differential gears. And guess what. A very nice 3.92 d44 set. With.... Drum roll please... A 1-31-63 date. I remember the truck. I drove it in. T case was toast. No good tires. In the 80's I could not get two hundred for it. So I ripped it to bits and sold all the good stuff. I always tore the frontends apart. The axles and spindles always made me a few hundred. So now Cecilia can get the ring and pinion.

[Charon]

Crazy!