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Old 07-29-2018, 12:01 PM
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Transmission: T5
Rear end gears
Hi all. looking for some advice on rear end gearing. I'm planning an LS3 / t56 swap in my 89 iroc and wasnt sure what would work best for rear end gearing. Was thinking 373 or 411. I would like to be able to drive on the highway at a reasonable RPM. Current rear with my T5 is a 308 posi. Any advice would be greatly appreciated.
Last edited by sonic1971; 07-29-2018 at 12:03 PM. Reason: title fix
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Old 07-29-2018, 12:34 PM
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Car: '84 Trans Am
Engine: 357 SBC
Transmission: 700R4
Axle/Gears: 10 Bolt 3.73, Torsen Diff
Re: Rear end gears
You can go pretty steep with a double overdrive... I've heard\read of lots of people happy on the high way with both 3.73 and 4.11 in 6th gear.
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Old 07-29-2018, 01:36 PM
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Car: 1989 TPI Formula, 1984 MCSS
Re: Rear end gears
I did a LS1/T56 combo with 3.73
If I did it again, I’d go 4.11
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Old 07-29-2018, 02:07 PM
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Re: Rear end gears
sounds like 411 is the way to go. Thanks gang
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Old 08-04-2018, 04:03 PM
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Car: 1986 iroc
Engine: alum. head 350 supercharged
Transmission: 6speed
Axle/Gears: ford 9in 3.90 35 spline moser axles
Re: Rear end gears
i have 3.90s now and cruise at 80 @1800 lol
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