88 k2500 silverado

Dose any one know what the gear ratio is from factory

Dose any one know what the gear ratio is from factory

Should be on a placard in the glove box.

My '88 K1500 has 3.42s, listed as GU6 on the glovebox decal.

G80 is limited-slip, which would be very welcome but alas is not installed.

I think 3.42 is the standard ratio in K-trucks with a ten-bolt 8.5 ring-gear axle.

3.73 seems to be the standard ratio in K-trucks with the 14-bolt 9.5 ring-gear axle. That's GT4 on the glovebox decal. Again, locking differential is G80.

Ok I will take a picture of the place card in the glove box tonight and post it if I can and mine is auto locking hubs I dont have to get out and manually lock them

Hope this works

I have for g's GQ1 GU6 and G80

I have for g's GQ1 GU6 and G80

GU6 = 3.42 gears

G80 = Locking rear differential

Locking rear differential has NOTHING to do with locking hubs.

Wish mine were G80; although there's an astounding number of folks who seem to blow-up the 8.5 ring gear locking rear diff. The 9.5 seems to be far superior.

Keep in mind that the vehicle is more than 25 years old, and the parts it was built with could have been replaced three times by now.

True but I dought it my father has only replaced the motor and had the trans rebuilt.... dose any one know where to find out what all the codes in the glove box mean

True but I dought it my father has only replaced the motor and had the trans rebuilt.... dose any one know where to find out what all the codes in the glove box mean
1. Type "GM" and the code into any search engine.

2. Search for a list of GM option codes.