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Re: Gears
My '89 Suburban came with the 3.42 diff. It's fine. I have towed with mine - 5-6000 lbs, no issues. I think a 4:10 in these trucks is overkill unless you 4 x 4 frequently doing rock crawling. In which case you could just use 4Lo. I'm sure it will help your rpms/fuel economy.
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1989 Suburban 1500 4 x 4
1989 BMW 325i
1945 Willys MB Jeep
1959 Triumph TR3A
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