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ok i have a 2003 silverado and i have done a few minor mods to it ( intake, programmer, exhaust) it isnt hooking up much so i figure is would change the gears in the rear end to make it a posi so i might hook up better. what all do i need just a posi traction gear or is there more involved than this? also what gear do you prefer a 373 or 410. im gonna be running 22s and do mostly city driving with an accasional highway driving. Thanks Matt Adams
 

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GMFS slowest truck :read:
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changing gear lube wont do shit...does running valvoline racing oil in your engine make it a race car motor now?

You will need a limited slip or full locker. Most people who DD their trucks will go for a limited slip. I prefer a full locker myself, but thats just me. Definately go with atleast 4.10s. Expect to spend 300-500+ for a limited slip, another 250 for gears and master install kit, and another 250-300$ in labor to install it all.
 

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GMFS slowest truck :read:
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thanks for the help. i think you read something wrong though i didnt say nothing about gear lube lol
yeah i added in a word...lol...still half asleep this morning.

tru-trac seems to be the way to go.
 
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