I have a 2005 chevrolet trailblazer ext lt 4wd; when driving down the down the my rear diver side tire sometimes shifts and makes like a poping sound, also when I am making left hand turns the tire shift and makes a sound. I do not have normally tires on the vehicle I am driving with 275 40 R20 on the rear and 275 45 R20 on the fronts, can anyone tell what could be the problem, I am thinking it could be the wheel bearing going bad or it may be the spacers, I bought the car used from a dealership so it came with the rims and tires already on it. So not sure if spacers where used.
If tires are too big it will rub when making turns.
On 4 wheel drive vehicles the tires MUST be the same size unless specifically recommended otherwise by the vehicle manufacturer. The proper tire size will be listed on a tag on the driver's door post. According to www.tirerack.com the proper tire size all the way around is 275/45/20. You need to get those 275/40/20 tires off of the rear. Having odd sized tires on an AWD vehicle will cause excessive wear to the transfer case, front and rear differential and the tires. If your 4 wheel drive is shiftable (in and out of 4wd) do not use the 4 wheel drive function till the tires are all the same size and diameter. Something to check would be see if all the lug nuts are tight. A trip to a suspension / alignment shop might be a good idea.
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