slow sierra

I have an 03 GMC Sierra Z71 5.3 only mods to truck right now is Valont cold air intake, 4:56 gears with true track. 1/4 mile time is 16.40. Trying to decide which route to go either super charged or turbo to get the truck in the 12's and still be a good dependable daily driver with what mods I already have. Suggestions please.

03sierraslt

iTrader: (22)

What all do you use the truck for? Plan for transmission mods also.

slow sierra

I use the truck to travel back and forth to work and wanting to build a weekend racer out of it. It has 110,000 miles on it. Transmission has been serviced ever 15,000 since new. Has full billet servo by GM and shift kit.

jmgak47

iTrader: (3)

The factory 4L60e is not going to cut the mustard with a setup that will run 12's.

slow sierra

Do you think lvl7 4l65 could handle the power or just do 4l80 swap

jmgak47

iTrader: (3)

Yes it should but it would be wiser to go with a 4L80e, its just a better design to handle power. Also you can basically have a stock unit and handle the power to run 12's.

slow sierra

Thanks for advice on trans i had already been looking in to the 4l80 swap and i guess that will be the way i go it just looks like a good size job doing that on a 4x4

black00chev

iTrader: (2)

No matter what, I suggest getting a 93 octane live tune ASAP. One of the best bang for your buck mods you can do.

You could probably get high 12s on a beefed up 60/65e with a tvs or old radix.

slow sierra

yeah i have got a mail order tune on its way from Nelson Performance for right now. I figured that would be better than nothing and seen a lot of good comments and they have been great people to deal with. But do have a guy about 2 hours away that I have been talking to about getting live tune work done when I decide which route I want to go next. I have been looking at lt headers but dont know if I should drop the money on them or just go ahead and do the trick tubo kit. But I know with the 4:56 gears I have from what I have read that I am probably more suited for a pro charger.