sm465 gear ratios

[1987chevyv10]

I'm new to this forum and this will be my first post. but I just picked up a 1987 Chevy v10 with the sm465. does anybody know what gearing they have from the factory? thanks
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[Wellgeo03]

Got these numbers off a gear ratio calculator site, so take them for what you will.

1st: 6.65
2nd: 3.58
3rd: 1.70
4th: 1.00

Not sure if you had a miss type, but to the best of my knowledge GM has never had a V10 eingine...

[1987chevyv10]

Originally Posted by Wellgeo03

Got these numbers off a gear ratio calculator site, so take them for what you will.

1st: 6.65
2nd: 3.58
3rd: 1.70
4th: 1.00

Not sure if you had a miss type, but to the best of my knowledge GM has never had a V10 eingine...

thanks! and it isn't a v10 engine, started in 1987 they used r/v instead of c/k so it's just a k10
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[Turbo85GMC]

I think the original poster means "V10" to be a R/V series truck.
I think they changed the model numbers in '86 or '87 from C/K to R/V.

Anyway, welcome to the SM465 club! I have yet to find an on-road use for first gear! If 1st and 2nd were synchro, I would swap out the rear end to a 2-something ratio and drive it like a 4 speed instead of a 3 speed.

[1987chevyv10]

Originally Posted by Turbo85GMC

I think the original poster means "V10" to be a R/V series truck.
I think they changed the model numbers in '86 or '87 from C/K to R/V.

Anyway, welcome to the SM465 club! I have yet to find an on-road use for first gear! If 1st and 2nd were synchro, I would swap out the rear end to a 2-something ratio and drive it like a 4 speed instead of a 3 speed.

thanks! what's the rear end from the factory? right now it has 35 inch tires on it and it seems to need a little lower rear end
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[Wellgeo03]

Oh, yep, I completely miss read that part!