New 05 Duramax 2500 4x4 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

semperfidoordie · 06-23-2009, 10:11 AM

Just got a new duramax and was curious what the biggest size of tires was that would fit without rubbing and no lift on my truck on the stock HD wheels. Any advice?

**Palf70Step** · 06-23-2009, 12:13 PM

I have seen 305/75's used on stock rims, but it litterly left no room for error.

**WestButteTruck** · 06-23-2009, 07:40 PM

I think you'd be lucky to get 285's under there with no lift.

I have an 05 1500hd with is essentially the same as the 2500 and I had to crank the torsion bars a little so my 265 BFG's wouldn't catch the front valance. Might depend on the tire brand as well.

semperfidoordie · 06-23-2009, 09:51 PM

Thanks west and palf appreciate it.

DirtyLarry · 06-23-2009, 11:48 PM

Crank up the torsion bars and trim the bump stops a bit and you will have plenty of room for 255/85R16 (tall skinny 33’s) or 285/75R16 (32”). I have two Silverado’s running each tire size and like the 255/85R16’s the best but tall skinny tires do not appeal to everybody. 305’s will rub the inner fenders like crazy with stock wheels. See sig for pictures.

While on the subject, contrary to popular belief, cranking the torsion bars does not cause a rough ride. Cranking the torsion bars causing the bump stops to smash into the control arm causes the rough ride. Trim or cut off the bump stop will fix that. Another misconception is the need for reclocked torsion bar keys. They are a waste of money on a HD truck as you can get the same amount of lift from the stock keys by adjusting them to the max and trimming the bump stops. Either way, the torsion bar is twisted the same. I wasted money getting keys for my 2005 while I got the same lift on my stock keys on the 2001.

This is a good read on this subject. They also have great products.
http://cognitomotorsports.com/store/page36.html

semperfidoordie · 06-24-2009, 09:42 AM

Thanks Larry now I'm new to this so how do you crank the torsion bars exactly?

**Palf70Step** · 06-24-2009, 04:59 PM

I was talking to the guy today with teh 305s and Larry is correct. We crank the bars a hair (put in a piece from a F-rd I think he said. and also they were 305/70's not 305/75. The lower profile helped with the clearance. But like was mentioned, there is no rood for rough stuff. His truck is pretty much a yuppy 4x4, probably never even seens a rough road, let alone one that isn't paved.

semperfidoordie · 06-24-2009, 06:44 PM

what would you guys suggest for a tire that would fill the wheel well more, require no lift and still get good traction for off roading while maintaining the stock 16" rim?

**Palf70Step** · 06-24-2009, 07:30 PM

285/70x16 or 285/75x16

06-23-2009, 10:11 AM	#1
semperfidoordie Fix It Till It's Broke Join Date: Apr 2007 Location: 29 Palms, CA Posts: 1,616	New 05 Duramax 2500 4x4 Just got a new duramax and was curious what the biggest size of tires was that would fit without rubbing and no lift on my truck on the stock HD wheels. Any advice? __________________ Tony Black Beauty: 85 C-10 SOLD! Great White: 69 LWB Custom Camper/20 SOLD! Blue Dragon: 72 K-10 SOLD! The Tank 77 K-10 KIA panhandler62: Just don't search for "trannys" no matter how hard yours shifts -- you just won't get what you are looking for. I Made The Official So Cal Board Meet

06-23-2009, 12:13 PM	#2
Palf70Step State of Confusion! Join Date: Jul 2002 Location: Gulfport, MS USA Posts: 47,228	Re: New 05 Duramax 2500 4x4 I have seen 305/75's used on stock rims, but it litterly left no room for error. __________________ Bill 1970 Chevy Custom/10 LWB Fleetside 2010 Toyota Tacoma PreRunner SR5 Double Cab - DD Member of Louisiana Classic Truck Club (LCTC) Bill's Gallery Life isn't tied with a bow, but it's still a gift. Live simply. Love generously. Care deeply. Speak kindly. Leave the rest to God!

06-23-2009, 07:40 PM	#3
WestButteTruck Kung Fu Master Join Date: Oct 2005 Location: Montana Posts: 547	Re: New 05 Duramax 2500 4x4 I think you'd be lucky to get 285's under there with no lift. I have an 05 1500hd with is essentially the same as the 2500 and I had to crank the torsion bars a little so my 265 BFG's wouldn't catch the front valance. Might depend on the tire brand as well. __________________ 72 GMC SuperCustom 4x4 1972 Chevrolet Cheyenne Super 4x4

06-23-2009, 09:51 PM	#4
semperfidoordie Fix It Till It's Broke Join Date: Apr 2007 Location: 29 Palms, CA Posts: 1,616	Re: New 05 Duramax 2500 4x4 Thanks west and palf appreciate it. __________________ Tony Black Beauty: 85 C-10 SOLD! Great White: 69 LWB Custom Camper/20 SOLD! Blue Dragon: 72 K-10 SOLD! The Tank 77 K-10 KIA panhandler62: Just don't search for "trannys" no matter how hard yours shifts -- you just won't get what you are looking for. I Made The Official So Cal Board Meet

06-23-2009, 11:48 PM	#5
DirtyLarry Windy Corner of a Dirty Street Join Date: Jun 2003 Location: Pueblo West, Colorado Posts: 2,926	Re: New 05 Duramax 2500 4x4 Crank up the torsion bars and trim the bump stops a bit and you will have plenty of room for 255/85R16 (tall skinny 33’s) or 285/75R16 (32”). I have two Silverado’s running each tire size and like the 255/85R16’s the best but tall skinny tires do not appeal to everybody. 305’s will rub the inner fenders like crazy with stock wheels. See sig for pictures. While on the subject, contrary to popular belief, cranking the torsion bars does not cause a rough ride. Cranking the torsion bars causing the bump stops to smash into the control arm causes the rough ride. Trim or cut off the bump stop will fix that. Another misconception is the need for reclocked torsion bar keys. They are a waste of money on a HD truck as you can get the same amount of lift from the stock keys by adjusting them to the max and trimming the bump stops. Either way, the torsion bar is twisted the same. I wasted money getting keys for my 2005 while I got the same lift on my stock keys on the 2001. This is a good read on this subject. They also have great products. http://cognitomotorsports.com/store/page36.html __________________ Current vehicle collection: 1978 Chevrolet K10, 8.1L, NV4500, NP205 1989 Chevrolet Suburban, 8.1L, NV4500, NP241 1993 Chevrolet C1500 Sportside, TBI 7.4L, 4L60E 2001 Chevrolet K2500HD, Ext Cab, SWB, 8.1L, ZF 6 speed 2014 Chevrolet Impala LTZ 3.6L Vortec 8.1L because life is too short to tolerate underpowered vehicles Instagram

06-24-2009, 09:42 AM	#6
semperfidoordie Fix It Till It's Broke Join Date: Apr 2007 Location: 29 Palms, CA Posts: 1,616	Re: New 05 Duramax 2500 4x4 Thanks Larry now I'm new to this so how do you crank the torsion bars exactly? __________________ Tony Black Beauty: 85 C-10 SOLD! Great White: 69 LWB Custom Camper/20 SOLD! Blue Dragon: 72 K-10 SOLD! The Tank 77 K-10 KIA panhandler62: Just don't search for "trannys" no matter how hard yours shifts -- you just won't get what you are looking for. I Made The Official So Cal Board Meet

06-24-2009, 04:59 PM	#7
Palf70Step State of Confusion! Join Date: Jul 2002 Location: Gulfport, MS USA Posts: 47,228	Re: New 05 Duramax 2500 4x4 I was talking to the guy today with teh 305s and Larry is correct. We crank the bars a hair (put in a piece from a F-rd I think he said. and also they were 305/70's not 305/75. The lower profile helped with the clearance. But like was mentioned, there is no rood for rough stuff. His truck is pretty much a yuppy 4x4, probably never even seens a rough road, let alone one that isn't paved. __________________ Bill 1970 Chevy Custom/10 LWB Fleetside 2010 Toyota Tacoma PreRunner SR5 Double Cab - DD Member of Louisiana Classic Truck Club (LCTC) Bill's Gallery Life isn't tied with a bow, but it's still a gift. Live simply. Love generously. Care deeply. Speak kindly. Leave the rest to God!

06-24-2009, 06:44 PM	#8
semperfidoordie Fix It Till It's Broke Join Date: Apr 2007 Location: 29 Palms, CA Posts: 1,616	Re: New 05 Duramax 2500 4x4 what would you guys suggest for a tire that would fill the wheel well more, require no lift and still get good traction for off roading while maintaining the stock 16" rim? __________________ Tony Black Beauty: 85 C-10 SOLD! Great White: 69 LWB Custom Camper/20 SOLD! Blue Dragon: 72 K-10 SOLD! The Tank 77 K-10 KIA panhandler62: Just don't search for "trannys" no matter how hard yours shifts -- you just won't get what you are looking for. I Made The Official So Cal Board Meet

06-24-2009, 07:30 PM	#9
Palf70Step State of Confusion! Join Date: Jul 2002 Location: Gulfport, MS USA Posts: 47,228	Re: New 05 Duramax 2500 4x4 285/70x16 or 285/75x16 __________________ Bill 1970 Chevy Custom/10 LWB Fleetside 2010 Toyota Tacoma PreRunner SR5 Double Cab - DD Member of Louisiana Classic Truck Club (LCTC) Bill's Gallery Life isn't tied with a bow, but it's still a gift. Live simply. Love generously. Care deeply. Speak kindly. Leave the rest to God!



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