gear ratio 1980 chevy 4x4?

[tigwelder]

1980 K-10 gear ratio code G80.

[Blazin]

You will have to pull the cover, find the numbers on the ring gear, or count the ring, and pinion teeth.

[rainman15]

G80 is the code for locking differential, but that doesn't have anything to do with what gear ratio you would have.  If you have your build sheet handy look for something that starts with GQ and says something like "rear axle standard" or "rear axle optional". Give me your engine size and axle code and I can use that to pull your ratio.

[topp]

And the code will only be valid if a PO did not change the rear or the ratio......

[tigwelder]

only info i have is the tag in the glove box. has 350 engine ,350 turbo. thanks

[756man]

That is the tag you need !  GU6 =3:42, GT4 = 3:73, GT5 = 4:10