Gear Ratio

[Mudgrunt]

I have a 1999 Silverado 1500 4 wheel drive how do I figure out what gears are in the rear end.

[355REDNECK]

take rear end cover off and jack one side up leaving one side down and spin the side that is up and wait till u see numbers on the gears then take the big number and divide it by the little one

[Crazymays77]

Jack it up rotate the tire and count how many times the driveshaft turns to one full rotation of the tire

[J.C.]

Check the glove box for RPO codes.

GU6 is 3.42
GT4 is 3.73
GT5 is 4.10

[Mudgrunt]

Thanks for the help I have 4.10's

[ProGrade]

Thanks for the help I have 4.10's

im surprised!

[Mudgrunt]

That's what the RPO codes showed it's a nice surprise.

[duel1985]

Yeah me too. It must have been a special order. They normally have a or 3.73 3.42 you got lucky on that...