I have a 2006 GMC Sierra 5.3 Crew Cab with a Yank TT3000 torque converter. I am getting a custom tune soon and I wanted to do something else before the tune. What one mod would be the most noticeable between gears, cam, headers, shift kit, cold air intake, or anthing else?

I have 3.23 gears.

 

A cai isn't going to do shat compared to the others. Most people would tell you LT headers or gears for your next mod. I wouldn't do cam yet as you really need some long tube headers to get the full potential out of a cam. You don't wanna run stock truck manifolds with a decent cam.

What is your current gearing anyway?

 

since you have 3.23s, 4.10s would be the most noticeable in acceleration terms. But then you may have new traction issues. In lieu of that, I think a header/cam combo would be a REALLY big improvement, and since you have a 3K stall, you can be a little more aggro on cam selection

 

I'd say the headers, I would get all my supporting mods before camming imo.

 

just get the tune first and retune after. i would say gears, headers, then cam

 

What size tires are you running? Or wheel size? If about stock 3.90s or 4.10s.. Gears will help a ton move that heavy crew cab. I would go gears then headers then cam in that order

 

Gears first no doubt, get 4.11 to get that CC moving.

 

X2..... 4:10's would be the fist thing though!

 

Thanks for the replies. I have 20's so I think I will go with gears first. I never thought I would have 3.23's, I kinda figured the gears would have been steeper with a towing package.

 

yep, I guess they had sales projections that anticipated the only people that would buy the NBS were grandpas. I've got 3.23s & 275/45/20s. It can't get out of it's own way. It doesn't even spin from a stop to WOT, when it's raining. Getting 4.10s & trutrac here in the next few weeks.