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If you are replacing carrier bearings alot it is probably because of a bent/unbalanced shaft. If they are straight and balanced they'll go for a long long time. If a shaft is taken apart for u-joints and or a bearing and all of the parts are not put together clocked the same as they were originally balanced it's enough to screw up the balance. Most of these trucks have had the shafts apart at some time in their lives and many are just a little bent from years of having all of the the torque thrown at them.
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Saskatoon, Saskatchewan
Canada
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