gear ratios in 1st gens

[res0wc18]

what gear ratios were in the first gen auto trucks year 1989?

 

[argve]

3.54 and 4.10 were the most common.

 

[res0wc18]

so they never came with 3.08 gears? Is that just a rumor?

 

[argve]

I have never heard of it but that doesn't mean a lot

 

[youngcummins]

im not sure on the years. something like 89-91 they used 3.07 gears for the cummins only because they didn't have a overdrive. . if you are gonna look for them the only place i have found them is on ebay. from what i can tell none of the aftermarket companies make the 3.07 ring and pinion.