Question about 1999 Ford Explorer
Mismatching tires on Four Wheel Drive and All Wheel Drive vehicles can cause damage to the front or rear differentials and or transfer cases. So when replacing tires on these vehicles it is recommended to replace all four tires at the same time. Any thing over ¼ of an inch difference in the tire height can cause problems.
Limited Slip Differentials have clutches that are designed to engage if one wheel basically spins faster than the other to help maintain traction, so if one tire is smaller than the other the smaller tire will spin faster and the clutches will stay engaged all the time. This would cause damage to the differential in a short amount of time.
The Automatic Four Wheel Drive and the All Wheel Drive systems will also be effected by this. On the Automatic Four Wheel Drive system the on board computer reads the wheel speed sensors located at each wheel. If it sees a certain difference in wheel speeds it interprets this to be a loss of traction and engages the transfer case. If driven for prolong period of time on asphalt this will burn up the transfer case. All Wheel Drive system use what is called a Vicious Coupler. This is a unit inside the transfer case that has a special fluid inside it that when it heats up will engage the transfer case. If one wheel is spinning faster than the other then this will cause the coupler to engage and can cause damage if driven for prolong period of time. So if replacing tires on these vehicles do not try to replace two tires and get that extra mileage out of the other two. If you only replace one or two tires make sure to measure the circumference of the tires to make sure they are within ¼ inch. We had a vehicle in our shop once that had two tires replaced with same size and brand just the two older tires were three years older, and there was one inch difference in the height. Tires although they can be expensive are a lot cheaper than repairing or replacing the differential or transfer case.
Posted on Apr 13, 2009
That is absolutely and totally wrong. They want your money. Go to another tire place and have them replace only the tire that is bad. If your other 3 tires are bald or mis-sized, replace them also but it will not affect the tranny.
Posted on Apr 13, 2009
I always thought that was a BS line, but in one instance at the dealership I was working at, cust complaint was a weird feeling, binding, etc., in 4WD...Visual inspection showed all four tires were the same size and approx the same condition...After feeling the concern and being sure it was tires, we marked the floor/tires and moved the vehicle. Although the tires were the same size and condition, their rolling distance for one revolution was not EXACTLY the same...turns out tires were of different manufacturer. SDolution was to replace with four same branded tires, problem solved...I was somewhat on the fence about this condition, but now I will maintain four like tires on this type of vehicle....just my two cents...
Posted on Feb 04, 2015
It would only be necessary to replace all four tires if your Explorer has an the AWD option. If it does not replacing a individual tire will not cause harm.
Posted on Feb 03, 2015
Nonsense, ideally the tire should be the same size and brand/model, but if you can't readily get one, the same size and speed rating is fine!
The thief is trying to say that the slightest rotational speed difference will hurt the transmission, nonsense, that's what the differential is for! The wheels are constantly going different speeds around corners. Different sizes are too much for the ABS ssytem to deal with, but that's another story. Run from this crook and buy a tire somewhere else.
Posted on Apr 13, 2009
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Posted on Jan 02, 2017
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