I have a gas engine with the 140 amp alt in my 99 Yukon from the factory. Check your RPO codes in the glove box and it will tell you the alternator you have.
Im not gonna lie, I saw a mild increase in acceleration. Its the only mod on the truck right now but it does work, plus is makes noise!! Mileage....Im not too easy on the pedal so I cant give you an answer on that. It didnt make the mileage go down so thats good.
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