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I'm certainly not an expert on rear dif questions. you probably have a large tire as well since this is obviously a 3/4 ton. All this coupled with a probable th400 auto trans could be it. I'm not sure but I don't think those tranny's have a low first gear.
A gear like a 3.73 or 4.11's do make a big difference.
Did you try manually putting the shifter in 1st to see if there is any difference?
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'68 50th Anniversery LWB Custom Fleetside, '77 305 v-8, turbo 350, factory speed alert (still works), '71 drivetrain w/front discs. Some call it ugly yellow, others call it Ochre
'83 Jeep CJ-7, <80,000 miles, original owner
'04 Chevy Suburban, 4x4, 2500, 6.0 ltr, Predator Diablo programmer
'95 GMC K1500 Extended cab
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