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pete said: "[B] I figure the added wear on tranny and axles is easily offset by the reduction in rpms/engine life. [B]
The real concern is in the small stuff. bushings and brakes.
But with the majority of your driving being highway you probably don't need to worry
the tires weight about 3.5 lbs more and the 15 rims about 4lbs.
So you at 7lb x 4 = 28lb of moving extra weight.
the old set up was about 125lb moving and the new is around 148lbs.
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