Join Date: Oct 2001
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Ok, to my knowledge, they never came with 3.55's from teh factory, i think it was 3.42's, 3.73's, or 4.10's (but i could be wrong). My truck came stock with 265 /75 16's and has 3.73's. The general rule of thumb is that it isn't worht the cost to go 1 step in gear ratios, and 3.55's or 3.42's to 3.73's would be one step. The performance difference isn't really worth the cost. Remember you've got a 4x4, so you have to regear front/rear.
If i was at home i'd look up your factory tow rating, i think i have a 90 sales book, but i'm at college rite now. What cab/bed combo is it? 6000lbs is probably within the max rating, but its a lot of weight. If you are paying to have the gears installed, you should look into what a 90 or older 3/4 or 1ton truck would cost you, you may find that its not worth regearing. Anyways, got a bunch of my opinions/ideas in there, hope it helps!