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Go Back   Chevy and GMC Duramax Diesel Forum > Chevy / GMC Duramax 06-07.5 LBZ & LLY Forums > 06-07.5 LBZ & LLY Duramax Powertrain
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06-07.5 LBZ & LLY Duramax Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission Ect

 
       

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Old 10-30-2009, 12:41 PM   eBay Motors   #1 (permalink)
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4.10 or 4.56?

Recently lifted my truck and threw on some 35's. Just want to hear from some of you that have regeared and what gears you went with. I've done the math but i want some personal opinions. Thanks!
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Old 10-30-2009, 12:45 PM   eBay Motors   #2 (permalink)
seth999
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personally I would leave it, it has plenty of power to turn em but if your do get them I would just do a 4.10 the higher you go the more you cut off your top speed
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Old 10-30-2009, 12:52 PM   eBay Motors   #3 (permalink)
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i have read where guys regeared and hated it. with a diesel it's not required to regear.
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Old 10-30-2009, 01:09 PM   eBay Motors   #4 (permalink)
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i'd say 4.10, closer to factory ratio.

that way you won't lose acceleration, I could care less if a truck on 35's does 150MPH, in fact, I'd rather it not.
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Old 10-30-2009, 01:11 PM   eBay Motors   #5 (permalink)
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I just get more power to make up the difference I'm running 37's with stock gear no prob.
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Old 10-30-2009, 01:12 PM   eBay Motors   #6 (permalink)
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dont regear....i ran 35's for a while there is no need for it at all...it wont increase speed, power, or mileage
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Old 10-30-2009, 01:47 PM   eBay Motors   #7 (permalink)
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No need to regear guys are running 37's without regearing.
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Old 10-30-2009, 02:58 PM   eBay Motors   #8 (permalink)
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Well I regeared mine with 4.56's and i really like it. I'm running 35's now and plan on goin to 36's in the spring. My truck stills runs up to 95 or 97mph (whatever it is) if i need too and I don't think I'd like to go any faster with 35" mud tires anyway. I don't care what anyone says. You put larger tires on your truck and you feel a power loss. Why start adding alot more power to compensate and put that much more stress on your drivetrain? Regear and do it the right way.
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Old 10-30-2009, 03:12 PM   eBay Motors   #9 (permalink)
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Quote:
Originally Posted by LH4X4 View Post
Well I regeared mine with 4.56's and i really like it. I'm running 35's now and plan on goin to 36's in the spring. My truck stills runs up to 95 or 97mph (whatever it is) if i need too and I don't think I'd like to go any faster with 35" mud tires anyway. I don't care what anyone says. You put larger tires on your truck and you feel a power loss. Why start adding alot more power to compensate and put that much more stress on your drivetrain? Regear and do it the right way.
the right way is a matter is a matter of opinion and most people feel its less stressful to have engine turning much less rpm....

power is not an issue...my truck was equally fast with the 35's and 31's have i have now i just have the high revs i get on the highway
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Quote:
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right they just show n' shine aint spoolin that turbine
Quote:
Originally Posted by McRat
I think the Cummins guys are already datalogging in a very sophisticated manner:

"Heck Bubba, they ain't much smoke, I still sees the sun!"

"You right Jimbo, needs some of them .090" x 6 sticks prolly."
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Old 10-30-2009, 03:21 PM   eBay Motors   #10 (permalink)
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4.10's ONLY, 4.56 With way bigger tires like 40's maybe. You can just leave it alone. Their is only about 250-300 rpms that you are going to gain from what you have now to 4.10.
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