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Thread: 4.88 or 5.13

  1. #1
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    4.88 or 5.13

    What say you guys. I know people have been using 4.88 with 37 and 38 tires and seem happy with them. After playing around with gear calculators, Iím thinking going 5.13. Current relevant mods are 37 tires, long tube headers, hi flow cats, magnanflow exhaust, air doc with hi flow filter, Diablo 91 octane tune. I think the 5.13ís would work better with my off-road trailer were I could pull in overdrive. Trailer weighs between 2500 and 3000 depending on load out. So what do you guys think


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  2. #2
    Bogger
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    5.13 would sure help with towing but how often do you? The highway rpms would be too highnin dauly driving for 37s.
    4.88-5.13 is good with 40s too, 4.56 is good with 37s on a stock H2
    06 H3, Birch White, Lux , Cooper AT3 35s, Borla Performance Cat-back, Bilsteins front w/ 1/2" extended stops, Hunner sleeve, Air Doc w/ K&N filter, Oem Roof lights, 55W HID Headlights and 35W Fog lights.

    09 H3 V8, LS376/480 Conversion, 3000 stall, Arctic Silver, 35s, XD Rockstar Wheels 17x8 Front 17x9 Rear, OEM Sliders, 40K External Trans Cooler, Bilstein 5160s front 5100 rear, O.D. Steering Bracket, Daystar 1" Body Lift, Borla Performance Cat-Back, custom intake pipe & K&N filter, Custom PCM tune, Pioneer DVD unit, Aurora 40" LED Light Bar, 50 W HID Headlights

  3. #3
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    I guess my thought is that if I went 5.13 I could tow in 4th which would be lower rpms than if I went with 4.88 and had to tow in 3rd. Also I think 4.56 with 37ís bring me back to basically stock performance but honestly I think stock performance is pretty underwhelming


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  4. #4
    Bogger
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    Theory wise 4.38 is the gearing to bring back stock gearing so 4.56 is an inprovement.
    Just keep in mind with 5.13s you will be hitting 2500 rpms at 70 mph instead of 2000 rpms now. Its great towing but if you do get to 80 mph thats 3K rpms
    06 H3, Birch White, Lux , Cooper AT3 35s, Borla Performance Cat-back, Bilsteins front w/ 1/2" extended stops, Hunner sleeve, Air Doc w/ K&N filter, Oem Roof lights, 55W HID Headlights and 35W Fog lights.

    09 H3 V8, LS376/480 Conversion, 3000 stall, Arctic Silver, 35s, XD Rockstar Wheels 17x8 Front 17x9 Rear, OEM Sliders, 40K External Trans Cooler, Bilstein 5160s front 5100 rear, O.D. Steering Bracket, Daystar 1" Body Lift, Borla Performance Cat-Back, custom intake pipe & K&N filter, Custom PCM tune, Pioneer DVD unit, Aurora 40" LED Light Bar, 50 W HID Headlights

  5. #5
    Bogger
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    You know what, just go 5.13s! You can always use it to justify 40s in the future incase you have second thoughts
    06 H3, Birch White, Lux , Cooper AT3 35s, Borla Performance Cat-back, Bilsteins front w/ 1/2" extended stops, Hunner sleeve, Air Doc w/ K&N filter, Oem Roof lights, 55W HID Headlights and 35W Fog lights.

    09 H3 V8, LS376/480 Conversion, 3000 stall, Arctic Silver, 35s, XD Rockstar Wheels 17x8 Front 17x9 Rear, OEM Sliders, 40K External Trans Cooler, Bilstein 5160s front 5100 rear, O.D. Steering Bracket, Daystar 1" Body Lift, Borla Performance Cat-Back, custom intake pipe & K&N filter, Custom PCM tune, Pioneer DVD unit, Aurora 40" LED Light Bar, 50 W HID Headlights

  6. #6
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    Quote Originally Posted by amrg View Post
    Theory wise 4.38 is the gearing to bring back stock gearing so 4.56 is an inprovement.
    Just keep in mind with 5.13s you will be hitting 2500 rpms at 70 mph instead of 2000 rpms now. Its great towing but if you do get to 80 mph thats 3K rpms
    Yeah thatís why I keep thinking 5.13. Right now I canít tow in 4th so with 4.10 in 3rd Iím already a little higher in rpms than if I just go 5.13.


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