The Stovebolt Site Forums The Shop Area Driveline rear axle id?

Howdy,
just wondering if anybody here could help me with identifying what axle i have that came off my 57 GMC half ton. the numbers on it are:
K802
3725898
GM 31
its a 10 bolt with a third member. the bolts are only on the front of the axle and hold the thrid member in place. They really arent even bolts, just studs coming off the axle housing with nuts. there is nothing but a drain plug on the back.

Ok, got me puzzled here. Many GMC 1/2 tons of that vintage had a Spicer 45 rear end. The Spicer 45 is very similar to a dana 44. It would Not have a dropout 3rd member. Some GMC's got the chevy rear end, which was made by Eaton. This rear end would have a very round cover bolted to the back and a dropout 3rd member in the front. Both these axles would have a 6 lug wheel pattern.

Possible ratios for the Spicer rear are 3.08 or 3.92.
Possible ratios for the Eaton rear are 3.38 (after market), 3.90, and 4.11

Well this is a 5 lug. i Have no clue what it is or where it came from or whats it might be off of. thats why i thought id see if anyone knew anything about it here. and the ratio i THINK might be anywhere between a 3 somethin to a 3.3somethin, dont know. I tore it apart but never counted gear teeth

Sounds like it might be a passenger car rear. Is the 3rd member round, or more of a oval? Oval would be Chevrolet, '55-'64, round points more to Pontiac/Oldsmobile, maybe Cadillac.

Yeah i gues you could say its more oval than round. not by much but yeah it is.

Glad you posted this because, while someone here helped me identify the gear ratio by the code, a 3.90, but the part that clinched it was when the statement was made that "some GMCs got the Chevy rear end". That's a great description of mine! Now if I can get that pesky spline count and find out what differential's in it I'll be happy!