Need to regear; 4.10 or 4.30? - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 30 (permalink) Old 05-07-2009, 09:29 AM Thread Starter
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Need to regear; 4.10 or 4.30?

Ok, I put larger tires on my dually last month and I've decided a lower range gear is going to be a must. I went from the stock 32" tires to 36.5" commercial tires on heavier 22.5" big rig wheels, so I lost a lot of low end which is really felt when I'm going from a stop in 1'st gear. Already almost stalled out a few times. Right now I've got 3.73's with the 6-speed tranny; which gearing should I get that will place my truck closer to stock RPM's?

Here's some specs, while stock the truck would run 1920 RPM @ 65 MPH; right now it runs 1740 RPM @ 65 MPH.

So....4.10's or 4.30? And how much for parts and installation on a 4x4?

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post #2 of 30 (permalink) Old 05-07-2009, 10:00 AM
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4.10's IMO

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post #3 of 30 (permalink) Old 05-07-2009, 12:54 PM
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I've always found charts like this helpful to put things into perspective. (Ignoring the colors for the most part and just focusing on the numbers, since our trucks are a bit different.)

http://www.4lo.com/calc/geartable.htm

Looks like a 4.10 will still have you below factory, and a 4.30 will put you very slightly above, in terms of power curve/rpm vs. speed.
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post #4 of 30 (permalink) Old 05-07-2009, 01:54 PM
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36.5/32=1.140625 which means the tires are 14.0625% bigger than stock. So take 3.73 x 1.140625=4.25435125 gears would get it back to stock gearing. 4.30's is what you would want to have it back to stock.

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post #5 of 30 (permalink) Old 05-07-2009, 02:27 PM
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4.30's

Those big rig wheels suck a lot of power, you need to overcompensate with gearing.

If you're planning on towing anything heavy, you should look into 4.88's

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post #6 of 30 (permalink) Old 05-07-2009, 02:55 PM
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I have 37" tires and I went with 4;56's. I wish I would have went with 4;10's or 4;30. Either one I think will be good I would go with 4;10 if I was you IMO!!!
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post #7 of 30 (permalink) Old 05-07-2009, 07:49 PM
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I'm still here to say 4.10's will be better with all that power you've got. Being a tiny bit under might even help with fuel mileage.

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Stock 20's wrapped in 35x12.50R20 Toyo MT's, 3.73 gears, Nav, Backup Cam, Tailgate step, Upfitters, etc.
Mods: AFE Intake, Line-X, 20% Tint, Clear Bra, Husky Mats, Smoked Recon Mirror markers/3rd brake light, Bushwacker Pocket style flares w/ mud flaps + an aluminum Rapid Hitch (one of the best investments!)
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post #8 of 30 (permalink) Old 05-07-2009, 10:37 PM
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It's a waist of money to only go to 4.10's, you have to account for the diameter of the tire and the extra weight that they way, the weight in this case has a big contributing factor.

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post #9 of 30 (permalink) Old 05-07-2009, 11:15 PM
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Don't the tires have a lot less rolling resistance though?

2008 Red CCSB 6.4 Auto Lariat.
Stock 20's wrapped in 35x12.50R20 Toyo MT's, 3.73 gears, Nav, Backup Cam, Tailgate step, Upfitters, etc.
Mods: AFE Intake, Line-X, 20% Tint, Clear Bra, Husky Mats, Smoked Recon Mirror markers/3rd brake light, Bushwacker Pocket style flares w/ mud flaps + an aluminum Rapid Hitch (one of the best investments!)
Feel free to PM with any questions about any of my mods.

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Last road trip-567 miles @ 20.7 mpg @ 67mpg average speed.
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post #10 of 30 (permalink) Old 05-07-2009, 11:31 PM
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IMHO, 4.10's... I have 4.30's with 37's and its a little overgeared...

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