Re: More Power 4.3 TBI
Did the same thing you're doing to your 92. I got the rear end code from a GM service manual for the 3.73:1 axle ratio, went to the salvage yard and found the right rear end by looking at the codes in the bottom of the glove boxes of wrecked S-10/15 series trucks (where the vehicle options code sticker is located), picked one best one, bought it for $200.00, took it and my Jimmy to a competent differential shop where it was R&R'd; they also adjusted the brakes, filled it with synthetic oil and test drove it for me ($150.00). I picked it up the next morning and took off for Colorado for a ski trip. From start to finish of project: 24 hours. The results? All I can say is Wow! Made TONS of difference in performance, excelleration and virtually eliminated "gear searching" from 3rd to 4th. It also suprised me how much more "zip" it had in the mountains--especially while going over the higher passess. One benifit I hadn't planned on is a tad better gas milage than before (was running a 3.08 with 235/75 R15's). It takes off effortlessly from stoplights now, it can powerslide around corners (not recommended as raised jimmys can flip) as well as run--and stay--in overdrive at 85 mph. Gearing, gearing, gearing...then do the rest.
Luck and success,
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