Help with IDing rear diff - The 1947 - Present Chevrolet & GMC Truck Message Board Network

10-16-2019, 11:18 AM

#23

hatzie

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Join Date: Oct 2008

Location: Wentworth, NH

Posts: 4,977

Re: Help with IDing rear diff

Quote:

Originally Posted by Dleslie212

Part of the reason I bought this truck was to be able to wrench on it, and learn things, and I just think it’s cool to know every inch of it like the back of my hand. I think I’m going to wait and rebuild it completely myself in a few months. I’ll orobably completely redo everything except for the axles themselves

It's a K series so you'll need to match the front and rear axle ratios.

It should've been stamped a little closer to the carrier mounting surface but it's still reasonably readable.

Looks like the part number is 3817778
The gear stamp looks like 11:41

GM 3817778 is a 3.73:1 gear set.

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RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials...

Please include at least the year and model in your threads. It'll be easier to answer your questions.
And please let us know if and how your repairs were successful.

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