anthony251

I have a 2003 silverado ext cab 5.3l my mods are 228-230 cam hooker long tube headers and cold air intake also built trans, well my rearend has 3:42 gears and the truck just feels sluggish and dosnt pick up speed like a stock truck would I do have the truck street tuned for now but gonna go with a Dyno tune after I replace my rearend (spider gears going out) my question is should I go with a rearend set up with 373 gears or 4:10 gears? I don't wanna throw my mpg away as I'm getting pretty good mpg now but if like to have my truck faster so maybe a 3-5 mpg lose I can deal with that. What do you guys think?

GMCSIERRA5.3

Go with 410s dont waist your money on 373s

anthony251

Ok what rpms should I suspect at 60-65mph? Thanks

Ricksilvy

I'm at 2250 at 70mph on 29.5" tires with 4.10 gearing.

AKlowriderZ71

iTrader: (22)

What size tire are you running, and what torque converter do you have?

Filling out your sig would help.

anthony251

Sorry I didn't post that, it's a 3200 stall and I'm on stock rims and tires witch are 245/65-17 and I I will be buying 20-22 inch wheels pretty soon and they will be 265/35-20 or 22

AKlowriderZ71

iTrader: (22)

I'd probably go with a 4.30 or 4.56 gear since you're planning some heavy-*** rolling stock. Those heavy wheels are counter-productive for launching. It's almost like two steps forward & one step back.

gamble686

iTrader: (3)

4.10s seem like a great setup for you.

TechGM

4.10's and go with 20's if you're dead set on upgrading wheels. I wouldn't go bigger than that