Decoding rear differential casting number - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**Bob B.** · 02-17-2022, 02:48 AM

Yes, check the SPID label, should be in the glove box. Problem is these trucks were available with many rear axles, GM, Eaton, Spicer, ect.. Good news is most medium truck axles were common and used in many makes of trucks, so parts availablilty is usually not a problem.

Kateye_Kenzie · 02-17-2022, 10:14 AM

Quote:

Originally Posted by Bob B.

Yes, check the SPID label, should be in the glove box. Problem is these trucks were available with many rear axles, GM, Eaton, Spicer, ect.. Good news is most medium truck axles were common and used in many makes of trucks, so parts availablilty is usually not a problem.

I feel kind of ridiculous asking but what's the SPID label? How would I read something like that? What does it look like? And why have I never heard of it before?

02-17-2022, 02:48 AM	#1
Bob B. Senior Member Join Date: Aug 2005 Location: Los Angeles Posts: 1,309	Re: Decoding rear differential casting number Yes, check the SPID label, should be in the glove box. Problem is these trucks were available with many rear axles, GM, Eaton, Spicer, ect.. Good news is most medium truck axles were common and used in many makes of trucks, so parts availablilty is usually not a problem. __________________ 1967 GMC CM-2500 Camper Cruiser, 351E V-6, NP 435 4 speed, Dana 60, and factory A/C. 2012 GMC K-3500 WT regular cab, 6.0L Vortec, 6L90.



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