The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - I think my C10 rear axle has a 2.5? rear gear ratio / is this true

G-NUT · 03-21-2018, 04:50 PM

Took the cover off just a bit ago. Found a part number on the edge of the ring gear. The number is as follows:
W GM 1235401 16 41 10 83

Also, I counted the teeth on the ring gear and pinion gear:
Ring gear had 41 teeth
Pinion gear had 16 teeth.

Found a part number on my axle tube: BN3 G300 1
And two part numbers on my center chunk, one on the left and right of the center: what looks like GM36 on one side and looks like maybe 14055251 or 405525 on the other side. Not sure what those mean.

03-21-2018, 04:50 PM	#3
G-NUT Registered User Join Date: Apr 2014 Location: Baldwin County, Alabama Posts: 162	Re: I think my C10 rear axle has a 2.5? rear gear ratio / is this true Took the cover off just a bit ago. Found a part number on the edge of the ring gear. The number is as follows: W GM 1235401 16 41 10 83 Also, I counted the teeth on the ring gear and pinion gear: Ring gear had 41 teeth Pinion gear had 16 teeth. Found a part number on my axle tube: BN3 G300 1 And two part numbers on my center chunk, one on the left and right of the center: what looks like GM36 on one side and looks like maybe 14055251 or 405525 on the other side. Not sure what those mean. __________________ '84 Suburban C10 Silverado - laying pinchweld to the ground on 22/24. /Porterbuilt / Accuair / Bonspeed / Landsail / Auburn Gear / Richmond Gear / Moser / Raybestos / ProMaxx / Edlebrock / Street Demon / Taylor Wire / K&N / MSD / KillMat / SOLD: 1985 GMC Sierra Classic 2500 3+3 Crew Cab Long Bed