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Old 02-02-2014, 06:51 PM   #1
richie 2
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Default dually gear change

88 chev 1 ton, dana dually rear. gonna take the gear change plunge...3'55? any horror stories? tks.
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Old 02-04-2014, 08:56 AM   #2
Kirk Morgan
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Default Re: dually gear change

Depending what your current gear ratio is you may have to change the carrier. Other wise on drama. Depending on which engine you have and tire size i like 3:73s better.

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Old 02-05-2014, 12:12 PM   #3
richie 2
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Default Re: dually gear change

tks kirk. I believe they are presently 4;56....16'' wheel/tire. 383ci hyd. roller block stroker, drt. torquer heads w/TBI. th.400 trans....not sure if there is a milage/towing converter available?
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Old 02-05-2014, 09:38 PM   #4
Alan Roehrich
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Default Re: dually gear change

ATI has a converter for it.

If you're pulling much, a 383 won't get it done with 3.55 gears. It'll do well to pull a heavy load with 3.73 gears, most small blocks are better off with 4.10 gears, even with a 3.75" stroke.

Fooling with small block engines in bigger heavy trucks, it seems most get better mileage and live longer with 4.10 gears.

There are a lot of 16" tires, some taller, some shorter. It makes a difference.
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