4wd tire slip and tranny trouble

Discussion in 'Trucks and Trailers' started by 93Chevy, Dec 28, 2009.

  1. USFGUY

    USFGUY LawnSite Member
    Posts: 59

    on AWD replace all 4.. otherwise.. keep same size tire and replace in front or rear pairs. On my dodge I replace front and rear at same time just for my peace of mind.

    AWD really requires all 4 tires being exactly what the driveline was designed for. I wouldnt stagger sizes on them at all. But with 4wd I have seen guys run rears MUCH bigger but doesnt really hurt until anything until they shift into 4wd... then the fronts drag compared to the rear... not good on the driveline.
     
  2. 93Chevy

    93Chevy LawnSite Fanatic
    Posts: 37,806

    Well, the tires are the same exact size, but the fronts have less bite because they're older and have a less-aggressive tread pattern.

    Basically, I don't have to worry about anything.

    Thank you for all your replies guys.
     
  3. 360ci

    360ci LawnSite Senior Member
    Posts: 991

    Depends on the form of AWD, electronically controlled AWD on premium luxury cars will have an effect on different tire diameters, as it affects braking and accelerating (wheels will slip more, etc). On my Durango, which is AWD (Full time all wheel drive) the transfer case is built for changing individual wheel speeds. Should I decide to lock the axles together, then it might become a problem with gear and driveline durability, but only over a prolonged period of time in very low traction conditions. On pavement, I agree, it would tear the driveline apart only locking the axles together (4HI/4LO). I run 30" tires on my R/T. For a while I had a nail in one tire and I had two P275/60R17 tires on order, but nothing was available locally in that size. I borrowed two worn down P265/70R17 tires and placed them on the rear. With full tread they would have been 31.6" tall. I would say they were at a good 31" when I had them installed until I could get my new tires.

    Most luxury AWD vehicles that I speak of only have tires that are good for 20-30K, so if the fronts wear faster than the rears, chances are both sets of tires will be near the wearbars anyway before it causes any problems, and a new set of four is installed. Trucks are meant to take abuse. I ran 31" tires on the back and 30" tires on the front for 1800miles with no problems, and the truck performed just as well as it did previously. The only thing I can think of is the speedometer reading might be off, but otherwise it's safe to do for short periods.

    If you don't rotate and the tires don't have a high tread life rating, I wouldn't get too concerned, but it's a good idea to rotate just to have the same grip on either axle.
     
  4. Accu-cut Lawn Care

    Accu-cut Lawn Care LawnSite Bronze Member
    Posts: 1,206


    You are incorrect. The "Lady" is too. It puts strain on the transfer case, transmission, and differentials when 4x4 is engaged and tire sizes are not the same. Though the front and back tires may be the same size numerically; they are not really the same. I would especially not risk it on a chevy drivetrain. You are fine, however, if you very rarely use 4x4... and only in very slippery "I just got stuck and need to get unstuck" type of terrain.
     

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