Drive Belt Tensioner Replacement Estimate for GMC R2500

GMC R2500 Drive Belt Tensioner Replacement costs $127 on average. Following is a breakdown of the labor and parts estimates.

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YourMechanic Price
$126 to $136
Labor: $70 -$80
Parts: $56
Average Dealer price
$206
Average Shop price
$154
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CarServiceYourMechanic PriceShop/Dealer Price
1988 GMC R2500V8-7.4LService typeDrive Belt Tensioner ReplacementYourMechanic Price$130.95Shop/Dealer Price$160.70 - $217.30
Show example GMC R2500 Drive Belt Tensioner Replacement prices

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I thought that this return work would be covered by previous install and was surprise to see a $70 charge to my charge card? Perhaps this was in error? I supplied the gas as I did previously it leaked out due to a a faulty fitting not seen during installation I guess? Please advise.
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All about Drive Belt Tensioner Replacement

A Drive Belt Tensioner is a pulley mounted to either a spring mechanism or to an adjustable pivot point that is used to keep constant tension on your serpentine belt. That is the big long belt in the front of your engine. The tensioner rides on the outside surface of the belt to put pressure, or tension, on the belt and against the pulleys that drive things like the alternator, power steering, air conditioner, etc.

Drive Belt Tensioner Replacement Estimates for Popular GMC Models