Gears and posi help
 

I have an 03 4.8 silverado that I'm making my hotrod truck. I've had cam and stall done as well as cold air, electric fan and tune. Next is gears and posi but I don't know enough to know what kit to get. Any help will be much appreciated. This is still a daily driver and occasional trip truck so I don't need 1000 horse power. My plan is to get right around 5 or 600hp.

Depending on the mileage of the truck, I'd recommend a complete rebuild. Start fresh.

Cause you know just as soon as you open the diff cover and seal it back up, one if those pesky wheel bearings will start making noise.

The TruTrac is pretty popular and is a solid unit. As for the gear itself, 4.10s are a good kick in the pants.