Dif gearing

[Farm boy]

Ok I'm sorry i know there are a bunch of threads on this but I just cant quite get it

So I'm parting out my k10 and i have a guy that's interested in the front dif but needs to know the gearing. So I have looked in the glove box but the camper info sticker ether doesn't have that info or it's on the missing part. So I jacked up one front tire and turd the drive shaft till the tire made 2 turns. The drive shaft turned 3 1/10 to 1/8.

So my question is do you guys know what gear ratio that would be? Can I figure it out from the vin, so I know for sure? Or is there another number I could check?

[Irish_Alley]

the only way i know is to take the cover off the diff and do some math with the numbers. there is a way with the way you did but i dont know it and dont want to guess when you could just find out for sure and the oil should be changed out anyway, this way you can inspect the ring and pinion also

[DustyRusty]

As Irish said, you can take off the diff. cover, etc.  Count teeth on both the pinion and ring gears.  Divide the number of pinion gear teeth into the number of ring gear teeth.  That will be the ratio.  Sometimes the ratio is stamped on the edge of the ring gear.

[Farm boy]

Yah I should probably check it out before selling it anyway. It's just that I currently still have the truck assembled and would rather not take it out thus disabling the truck till I know he wants it. So I guess I will need to take it off still on the truck and eat the cost of new fluid.

[Irish_Alley]

i wouldn't fill it back up just let him know. he would probably want to change fluids anyway

[Farm boy]

I meant if he doesn't want it do to wrong gearing, I'd probably fill it back up. But now that i think about it; since it's the front diff and it doesn't turn if not engaged I mite just leave it till I've sold it.