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Go Back   Chevy and GMC Duramax Diesel Forum > Specialty Forums > After Market Mods. > Wheels&Tires
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Wheels&Tires Discuss what wheels&tires are right for you.
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Old 10-16-2008, 08:43 PM   eBay Motors   #1 (permalink)
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tires and gearing

I know most here have said dont bother gearing with 33" tires. but i just want to see what would happen. if I were to run a 4" exhaust and a ppe and say be at around 21-22 MPG with 265/75/16's and 3:73's........if i ran 33x12.5's and dropped to 4:11 or 4:56 what would change fuel economy wise? also same question with 35x12.5's.

also i have been out of the off road game for a long time so roughly nowadays what would it run to have a gear swap done on both axels including a durable ring and pinion?
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Old 10-16-2008, 09:50 PM   eBay Motors   #2 (permalink)
maxxflip
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dont know about regaering but i run 20 mpg with banks on 6 @65mph 1600 rpm on 33's factory intake and exaust
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Old 10-16-2008, 11:41 PM   eBay Motors   #3 (permalink)
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it wouldn't be cost effective to regear for 33's but 4:11s would be good to regain some low end they would be nice for towing or running it down the track but 4:56 is wayy out there
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Old 10-16-2008, 11:58 PM   eBay Motors   #4 (permalink)
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It really wouldnt be worth doing if you go up to a 33 (285) but it could be worth it going to a 35+. Not sure what the mpg gain would be but Id say clost to what your getting now. Also, ya you would have to change the rear and front diff gears to.
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Old 10-17-2008, 12:18 AM   eBay Motors   #5 (permalink)
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ya , i know i would have to change front and rear. :tease

my buddies chevy 2500 with a 6.0 has 4:10, holy whiplash. he runs 265's. would 35's with 4:56 be about the same way? and yeah other than stock, i'm thinking 33's are a waste of time. if i go it'll be 35's.
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Old 10-17-2008, 12:51 AM   eBay Motors   #6 (permalink)
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Oh sorry... I thought you were asking IF you needed to change it.. Not how much... My bad
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2006 Silverado 2500HD LBZ CC SB
Escalade Handles, Front windows tinted to match the rear, painted bumpers, billet grille
4 Kicker 10in Subs in 2 custom box's, Autometer Ultra lite II Pyro and Boost gauges
MBRP Turbo Back Stainless Exhaust (Straight piped), w/ stainless tip! PPE Hot+2
285/75/16 Nitto Terra Grapplers on Gear Alloy wheels
****Lost Kitty Reward if found!!****
1999 Ford F-550 PowerStroke ''Wrecker'' **Jerrdan bed, S&B Intake
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Old 10-17-2008, 01:02 AM   eBay Motors   #7 (permalink)
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yeah just trying to get an idea. one axle(for refference) buying ring and pinion and changing it at aroung $70 hr.
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Old 10-17-2008, 01:20 AM   eBay Motors   #8 (permalink)
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You'll defiantly have to call around. Id look online and get prices for the gears then call local shops and see how much they want to do the install. Theres obviously no set price so the price could change by a couple hundread depending on where you go.
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2006 Silverado 2500HD LBZ CC SB
Escalade Handles, Front windows tinted to match the rear, painted bumpers, billet grille
4 Kicker 10in Subs in 2 custom box's, Autometer Ultra lite II Pyro and Boost gauges
MBRP Turbo Back Stainless Exhaust (Straight piped), w/ stainless tip! PPE Hot+2
285/75/16 Nitto Terra Grapplers on Gear Alloy wheels
****Lost Kitty Reward if found!!****
1999 Ford F-550 PowerStroke ''Wrecker'' **Jerrdan bed, S&B Intake
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