04-12-2014, 09:23 PM
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#1
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Safe to replace just 2 tires on 4WD (V8)?
Since it's full-time 4WD, is it necessary to replace all 4 tires at once? Or, can they be replaced 2 at a time?
Sorry if it's a stupid question. TIA.
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04-12-2014, 09:30 PM
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#2
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I'm not a 4WD expert... but I don't believe it would be necessary to replace all 4 at the same time. I'd put the 2 new ones in the front(rather have a blowout in the rear on the highway if I had to choose) but otherwise I think you're good with replacing 2 at a time.
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04-12-2014, 09:41 PM
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#3
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Quote:
Originally Posted by jambone
Since it's full-time 4WD, is it necessary to replace all 4 tires at once? Or, can they be replaced 2 at a time?
Sorry if it's a stupid question. TIA.
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I think a more important question would be, why are 2 tires more worn than the others? As long as they're being rotated regularly, they should wear pretty evenly.
Second question would be, how worn are the other two? If they're like-new, it shouldn't be a big deal. You want to try to avoid having mismatched sizes if you can, even though with the center differential open, it shouldn't affect much.
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04-12-2014, 09:46 PM
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#4
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Quote:
Originally Posted by NJshadow93
I think a more important question would be, why are 2 tires more worn than the others? As long as they're being rotated regularly, they should wear pretty evenly.
Second question would be, how worn are the other two? If they're like-new, it shouldn't be a big deal. You want to try to avoid having mismatched sizes if you can, even though with the center differential open, it shouldn't affect much.
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If they weren't rotated regularly assuming full time 4WD (no burnouts etc from rear)the front 2 would wear faster due to turning
Edit: thats assuming the more worn ones on his rig are in the front.. If not, then forget that! Yeah that'd be a little strange
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04-12-2014, 10:25 PM
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#5
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Quote:
Originally Posted by NJshadow93
I think a more important question would be, why are 2 tires more worn than the others? As long as they're being rotated regularly, they should wear pretty evenly.
Second question would be, how worn are the other two? If they're like-new, it shouldn't be a big deal. You want to try to avoid having mismatched sizes if you can, even though with the center differential open, it shouldn't affect much.
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Toyota says they need to be within a few 32nds of each other otherwise it could cause issues. Tough you may be able to get away with 2 similar on the front axle and 2 similar on the rear axle.
I will mention that the Center Differential on all US model 4th Gens is a Torsen T3 "Torque Sensing" unit and according to Toyota while unlocked has the ability to mechanically adjust power ratio (at least that's what their literature says, I never bothered to verify this.)
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04-12-2014, 10:43 PM
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#6
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Quote:
Originally Posted by jambone
Since it's full-time 4WD, is it necessary to replace all 4 tires at once? Or, can they be replaced 2 at a time?
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Depends on what exactly it is that you're asking.
If you're asking about otherwise identical tires (and hopefully you are) where the new pair simply has more tread depth then it's a matter of how much difference is acceptable.
Personally, I'd be okay with anything less than 4/32 difference.
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04-12-2014, 10:53 PM
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#7
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I bought the truck used with 4 new (crappy) Americus(?) tires on it. 1 of my rear tires picked up a utility knife blade that cut into the shoulder of the tire - irreparable. I wasn't going to put another Americus on it (wouldn't even know where to find one of those), so I bought 2 new Michelin LTX M/S 2's (of the same size). New tires on the back, best 2 of the remaining 3 crap tires are on the front. I really don't want to spend the additional $550-$600 right now if it's not necessary. I'm hoping it can wait a few months.
Thanks for the responses, I appreciate it.
Last edited by jambone; 04-12-2014 at 11:00 PM.
Reason: Added that the tires of the same size.
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04-12-2014, 10:55 PM
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#8
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I'm surprised it would be a problem with a open center diff? I know its a serious thing on Subaru's with symmetrical awd. With the open diff i don't see an issue.
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04-12-2014, 11:00 PM
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#9
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Quote:
Originally Posted by thatoneguy
I'm surprised it would be a problem with a open center diff? I know its a serious thing on Subaru's with symmetrical awd. With the open diff i don't see an issue.
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Its a Torsen T3 last time I checked, its not open.
Torsen - Wikipedia, the free encyclopedia
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04-12-2014, 11:48 PM
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#10
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Quote:
Originally Posted by BlackWorksInc
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Isn't it basically open but distributes power accordingly due to imbalances?
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04-12-2014, 11:56 PM
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#11
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Quote:
Originally Posted by NJshadow93
Isn't it basically open but distributes power accordingly due to imbalances?
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Yes, but consider that an imbalance can occur due to the vehicle having different diameter tires, thus requiring more or less effort on those axles. Like I said Toyota say even a few 32nds difference could cause issues in the system.
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04-13-2014, 12:55 AM
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#12
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Wouldn't the problem be if you were driving in snow or otherwise traction limiting surface. I have seen 4wd trucks were the rear was trying to pass the front because of tire differences.
Not saying this would happen with the 4R but like Blackworks said I think you could put some stress on things causing wear and $.
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Last edited by V8Man; 04-13-2014 at 01:02 AM.
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04-13-2014, 01:07 AM
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#13
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you need to do all 4. think of it this way... imagine you wearing a tennis shoe on one foot and a flip flop on the other. you won't feel anything causing damage but over time it will cause bad damage. having the different 32nds will/can cause issues with your drivetrain! one down fall to full time AWD!
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04-13-2014, 01:21 AM
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#14
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Quote:
Originally Posted by lilreds21
you need to do all 4. think of it this way... imagine you wearing a tennis shoe on one foot and a flip flop on the other. you won't feel anything causing damage but over time it will cause bad damage. having the different 32nds will/can cause issues with your drivetrain! one down fall to full time AWD!
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That's just untrue. Having different wear on 2 of 4 tires (if they're the 2 replaced are on the same axle) will probably not cause issues with the drive train since it's AWD. If OP drove around with center diff always locked, it'd be different, but that just doesn't happen.
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04-13-2014, 05:19 AM
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#15
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With all the debate, in the end, are you willing to find out the results ? The hard way with an expensive drive train repair ? All to save ~$500 vs $2500+
Your money your truck.
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