well I have a 2005 ccsb 5.3L 2wd with 20 inch wheels and tires.
long tubes, u/d pulley, cai, off road y pipe, magnaflow exhaust, 212 218 522 529 114lsa cam, gm blue springs, 7.4 CM pushrods, vette servo, msd wires, ngk tr55 plugs, and a nelson performance tune.

well my problem is the truck still feels slow. I think it needs a stall and maybe a set of heads. but I feel like just saving up for a 6.0L, im lost at what to do from here. please help.

 

or maybe just give me a few suggestions. thanks

 

3000 3200 stall will deff help things out , maybe some lower gears to get that thing moving as well .

 

yeah im thinking it needs a stall and tru cool, and maybe a trans go shift kit.

 

Yep.
What tires size and gear?
Gears will probably be the biggest butt feel change.

 

275/55 20 with 323 gears I think

 

So basically as 32" tire.
Do you plan to go up or down tire size?
Id say try some 4.1X gears.

I dont know what those trucks come with. Im kinda a 14 bolt guy...
But Id say you need more gear and youll feel it.

 

Should be a 3.42 gear... Higher stall converter, 4.10 gears and look at how much your tires/rims weigh.... Im having kinda same issue with my truck at moment considering i cant even get her to break traction half the time... I didnt even think about the fact that when i put the current trans in, i ordered it with about an 1800 stall... Then add the 100-120lbs per tire and wheel and 345hp to rear wheels feels slower than the stock 5.3 was. The 5.3 would turn tires over but the torque curve was actually where it needed to be with the 1800 stall!!! Ive come to learn you kinda want stall to be about 500-1000 rpm over where the power band of the cam starts... So you dont have the lag when you shift into second....

 

<p>Those gears will kill your performance... Get 4.10's with a converter and then we can re address the issue. If it still feels slow and you don't want to go for some type of boost I have to vote for a 6.0 swap. You will need more cam to really get the most out of heads. A 6.0 with a cam that still maintains manners will **** all over the 5.3. Sad but true.</p>

 

this is what I would do aswell. the weight of those rims and tires defanitly are not helping you.