Will mis-match tire sizes burn up 4x4?? - Diesel Place : Chevrolet and GMC Diesel Truck Forums
 
Home Forum Market Place Garage Lounge (1) Tuning Library DTC Tool Register Vendors
Go Back   Diesel Place : Chevrolet and GMC Diesel Truck Forums > GM Diesel Engines > 6.5L Diesel Engine
Register FAQ Forum Rules My Replies My Threads Mark Forums Read Auto EscrowAuto LoansInsurance

DieselPlace.com is the premier Duramax Diesel Forum on the internet. Registered Users do not see the above ads.
Closed Thread
 
LinkBack Thread Tools
Old 12-20-2008, 12:13 AM   #1 (permalink)
fifthand
Diesel Technician
 
Join Date: Oct 2008
Posts: 142
iTrader Score: 0 reviews

Will mis-match tire sizes burn up 4x4??

Hello,

I had someone recently tell me that running mis-match tire sizes will ruin the 4x4 system in hurry. I do not have mis-match sizes but I do have different brand tires front to back. When I bought the truck the front tires were toast but the back were fine. One of the back tires has slightly more tread than the other but are otherwise identical. The front tires are of a different brand but the same size as the back. Shoud I be worried about running the truck in 4x4, considering the front tires are new and may be slightly "bigger" than the back?
Offline  
Quick reply to this message
Sponsored Links
Advertisement
 
Old 12-20-2008, 12:26 AM   #2 (permalink)
NVW
Diesel Specialist
 
NVW's Avatar
 
Join Date: Nov 2007
Location: Castor, Alberta
Posts: 731
iTrader Score: 0 reviews

Slight differences shouldn't matter. When you have mis-matched tire sizes is when I would worry.
Offline   Quick reply to this message
Old 12-20-2008, 12:28 AM   #3 (permalink)
Green Machine
She Don't Smoke!
 
Green Machine's Avatar
 
Join Date: Aug 2007
Location: Ohio
Posts: 4,290
iTrader Score: 1 reviews

Northeastern Ohio Diesel Crew Member

rear tires must be the same with the same amount of tread on them, because if one is smaller then your gears in the rear end are turning way to much then they need and you will burn up the rear.

Running same size tires are important when you have 4x4 engaged and have traction, it "could" bind up some stuff in the T-case. I'm no expert though :/ just what makes sense to me
__________________
Dyno on April '09 - HorsePower: 228 , Torque: 376 YouTube Video
Quote: "Mind over Matter - I don't mind cause you don't matter!"

Offline   Quick reply to this message
Old 12-20-2008, 12:30 AM   #4 (permalink)
edzzed
Diesel Master
 
edzzed's Avatar
 
Join Date: Dec 2003
Location: cloverdale bc
Posts: 2,689
iTrader Score: 0 reviews

i don't think mis matched tires will mess 4x4 however, it is more about the tires circumference and or diameter if you know what i mean. Ed
__________________
98 GMC dually 4x4. ip under warranty code 1216. 4 inch flo-pro from Warpspeed, turbo back exhaust, 2.25 inch x-over pipe. Boost and Pyro gauges. heath hp4, HO injectors, "A"T"T" turbo, remote mounted PMD with #9 resistor, vacuum pump removed and using can-tire belt #10006k, engine replacement @ 58000kms, new tranny @156,000kms and just hit 239,000kms, also have ALL LED lighting at rear, clear cab lenses with LED bulbs. rancho shocks all around. DEVILSOWN water/meth injection. Hayden 2839 fan clutch. 9 blade plastic Dmax rad fan, part #15-80690 at autopartstomorrow. Peninsular heads. B&M shiftplus. 24ft side-trak toy hauler. also running with a 1999 KLR 650 dual sport m/c. and a 12ft. aluminum Princecraft with a 9.9 hp TWO stroke Yamaha as I luv the smell of burning oil, NOT. and one wife who insists I keep a light foot on the pedal. we are year round campers. and we breed Toy & Standard Poodles, Boston Terriers and as well CKC Yorkshire Terriers. check out the 0-70 mph vid http://s130.photobucket.com/albums/p...0-70mph001.mp4
And the toys http://s130.photobucket.com/albums/p...rip2009237.jpg
Offline   Quick reply to this message
Old 12-20-2008, 09:23 AM   #5 (permalink)
mitchedo
Diesel Technician
 
Join Date: Nov 2007
Location: Bountiful, UT
Posts: 282
iTrader Score: 0 reviews

As long as you're using your 4x4 in slippery conditions only (rainy asphalt is NOT slippery enough), then it shouldn't matter. The slippery surface will allow the tires to slip. It's really no different from making turns with the center diff locked. If you're using your 4x4 on pavement, you're causing great stress to the components. Period.

This applies to part-time 4x4 only. If you have a viscous center coupling, then be very careful with your tire sizes. ...though even that isn't terrible if one's a little out.

As mentioned, I'd be more concerned with running mis-matched tires on the same axle than front to back. ...assuming you're not driving around on pavement with your 4x4 engaged.
__________________
1999 GMC K3500 Crew longbed, 136,000 miles
6.5(F), replaced under warranty in 2003 at 87,000 mi with new GM (AMG) long block
See pix of how the engine insides look at 49,000 miles here: http://members.csolutions.net/dougm/...ngineTeardown/
4L80E (original, as far as I can tell)
Bone stock, and staying that way (adding gauges)

Last edited by mitchedo; 12-20-2008 at 09:25 AM.
Offline   Quick reply to this message
Old 12-20-2008, 10:33 AM   #6 (permalink)
will92104
Diesel Technician
 
Join Date: Jul 2006
Posts: 253
iTrader Score: 0 reviews

I have been told that different size tires will mess up the gears in the differential because the smaller wheel is spinning faster than the bigger one. never tested it but it makes sense. i would say that as long as the tires have the same size stamped on them but wear is different then it should be no problem. I have ran mismatched tires but the same size and had no problems
__________________
1995 Chevy C2500 6.5TD excab longbed bone stock minus the cat, heath diesel pmd relocation kit, DIY turbo master, OPS Relay, K&N Cone Fliter. more to come eventually.
Stirring the pot club member #1

Last edited by will92104; 12-20-2008 at 10:36 AM.
Offline   Quick reply to this message
Old 12-20-2008, 10:56 AM   #7 (permalink)
fallout
Diesel Head
 
Join Date: May 2005
Posts: 34
iTrader Score: 0 reviews

Quote:
Originally Posted by fifthand View Post
Hello,

I had someone recently tell me that running mis-match tire sizes will ruin the 4x4 system in hurry. I do not have mis-match sizes but I do have different brand tires front to back. When I bought the truck the front tires were toast but the back were fine. One of the back tires has slightly more tread than the other but are otherwise identical. The front tires are of a different brand but the same size as the back. Shoud I be worried about running the truck in 4x4, considering the front tires are new and may be slightly "bigger" than the back?
Without knowing what exactly your drive train set up as long as the sizes are within .5-1 inch of each other you should be alright the slack in your drivetrain will allow for a variation of this much. Running different gear ratio's or substantially different size tires can cause your chain driven transfer case to go boom. as it is usually the weakest link. That being said I have a buddy that races in the mud bogs and he has 5.13's in the front axle and 4.10's in the rear, But the only time it is in 4 wheel drive is in the bog, and he still finds away for finding the weak link in his drivetrain usually with a big boom and grinding.
Offline   Quick reply to this message
Old 12-20-2008, 11:12 AM   #8 (permalink)
modified
Diesel Master
 
Join Date: Oct 2003
Location: NE Wisconsin
Posts: 3,125
iTrader Score: 0 reviews

As said, drive on slippery roads and your tires will slip as needed.
If you were really concerned, even if all tires were the exact diameter, improper air inflation will offset tire diameter from front to back.
To match tire diameters as close as possible to minimize drive train binding, measure the rolling radius or each tire installed on truck, (center of axle to ground), and inflate tires as needed to match them. First inflate front tires to the required 55ish PSI, and then inflate rears to match.
If altering weight in rear of truck, to rolling radius will change accordingly.
__________________
Modified

2002 Chev 2500HD Dmax/Allison X-Cab LB 4WD, B&W Goose Hitch with Companion 5th Wheel, Highway Products Tool Chest, Jordan Ultima 2020, Frederico sway bars front & rear, Air Lift SD Bags

Last edited by modified; 12-20-2008 at 11:14 AM.
Offline   Quick reply to this message
Old 12-20-2008, 03:29 PM   #9 (permalink)
Dracor85
Diesel Technician
 
Dracor85's Avatar
 
Join Date: Jan 2007
Location: Pittsburgh, PA
Posts: 250
iTrader Score: 0 reviews
Send a message via AIM to Dracor85

Northeastern Ohio Diesel Crew Member

running diffrent size tires on the same axle will mess with more than your 4x4 system. over the summer I had a set of 265/75/16's on my truck and ended up with a flat. my spare was a 245/75/16. it messed with the brakes, making the brake with the shortest tire work the hardest. also I had to use the 4x4 on some wet grass and even with the slippage of the grass you could still feel a skip every so often. that being said if you have the same size tires and one is more worn than the other i would say no to worry about it to much, but to be on the safe side dont run around with the 4x4 on on dry pavement as stated above, expecially if you have a posi or even worse with a locker.
__________________
~95' Chevy K2500 6.5 turbo diesel (F vin), Ext cab, longbed, 3.5" down pipe back, turbo master, boost gauge, high idle, vac pump MIA. Heath HO lift pump, 3.73 gears 213k mi, remote D-Tech pmd, new rad, rebuilt trans at 193k...
~97' Chevy K2500 Suburban, 6.5L Turbo Diesel, vin F, remote PMD, Turbo master 3.73 gears, 4" Dimond Eye exhaust, 183k mi
~98.5 Dodge Ram 2500 Cummins 24valve Ext cab, 4x4 148k mi
~96 Chevy K3500 dump/plow, all stock except gauges and shift enhancer 51k mi

Member #18 of the TLFTN Club - Loud and Proud
Offline   Quick reply to this message
Old 12-20-2008, 04:23 PM   #10 (permalink)
heymccall
Diesel Laureate
 
heymccall's Avatar
 
Join Date: Feb 2005
Location: Monroeville, PA USA
Posts: 12,873
iTrader Score: 0 reviews

Alright, to expound on what modified posted. Running mismatched tires (regarding their rolling diameter) will cause excessive binding in the 4wd components, namely the transfer case.
To check rolling diameter, with the truck on level lot, mark a line at the bottom of each tire (on the sidewall) (tape or wax pencil), and roll (drive) the truck forward for 10 tire revolutions as seen at one left side tire 'til the mark is at the bottom again. Any mark on the other 3, that is off by more than an inch, indicates a rolling diameter variation beyond acceptable, and it must be corrected to ensure the continued reliability of the 4wd components.
__________________
Brian
'13 Hyundai Genesis Coupe handshaker
'14 Peterbilt 337 handshaker
Quote:
Originally Posted by GetSome8.1HD
Its not like I said I enjoyed reading Good Housekeeping while taking a candle lit bubble bath then proceeding to using a loofah with exfoliating creams all while thinking about you . Now THAT would be creepy
Member #21 of the OiO association
Offline   Quick reply to this message
Sponsored Links
Advertisement
 
Sponsored Links
Advertisement
 
Closed Thread

Thread Tools

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Tire Sizes? whtALLIMAX Wheels & Tires 0 07-11-2009 05:31 PM
Tire Sizes Dhall2276 Wheels & Tires 3 06-18-2008 01:13 AM
Tire Sizes STAZ Wheels & Tires 1 01-10-2007 10:29 PM
Different tire sizes? dieselrcr337 Wheels & Tires 1 10-09-2005 12:52 PM
Tire Sizes Slickduster Wheels & Tires 2 05-02-2005 12:13 AM


All times are GMT -4. The time now is 09:44 AM.


Shoutbox provided by vBShout v6.2.1 (Lite) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd. Runs best on HiVelocity Hosting.
© AutoGuide

SEO by vBSEO 3.6.0