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Discussion Starter #1
the dealer told me i have 3.42's but i just wanted to see for myself. I can't find it anywhere in the manual. anyone know where to check? I'm also wondering which 5.3L i have, aluminum or iron (one is HO i believe??) My 8th letter in the vin is a Z which means i have flex fuel which i THINK means i have the weaker one.
 

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the aluminum one is the HO. if your vin reads z then you dont have it
there is a code in the glove compartment that will tell you the axle ratio.
or you could always get under it and spin the tires and watch the driveshaft.
 

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Discussion Starter #3
got it all solved, thanks
 
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