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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