I have a 2003 yukon with a 4l60e that is rebuilt but I dont like the way it shifts. pretty sluggish and I would like to put in a shift kit but do I have to tune it or can I just install the kit with no tune. Or would I just be better off installing a hypertech tuner or something like it and no shift kit? thanks

 

You can run the shift kit all by itself, or you can get it tuned and improve the shifts.

Don't get a programmer, they're crap and more expensive than a custom tune.

 

I just installed a shift kit and servo's with out a tune and it shifts awesome.
You don't want a tune that increases the line pressure ( shift firmness) with a shift kit. That would make the line pressure too high.

 

correct. You don't need to tune for a shift kit. It's designed to make the shifts quick and firm and servos make the shifts grab tighter and hold stronger.
Tuning would be for increasing shift points and reducing shift time.

Handheld Tuners are junk that will just increase line pressure which isn't really preferred on a stock tranny.

 

all of these guys are exactly correct... i had a stock truck and stock trans.. and a shift kit was one of my first mods.... i actually put a couple in myself... first one when i was seventeen and new very little... comes with a video and its pretty simple.. step by step...

 

which shift kit do you guys recommend. I have seen kits from 50 to 250 bucks. This trans is rebuilt with some updates like 3/4 clutches and the beast sunshell. I dont need a race shift but just a good positive shift. thanks for all the input too..

 

Transgo is a good one, also get 1-2, 3-4 and forward accumulator pistons, transgo separator plate and you're set.

Sonnax is a good brand too

 

TCI Auto 376002 - TCI Trans-Scat Valve Body Kits can get through Summit for $74.95 comes with vette-servo

 

Umm, no stay away from TCI, B&M .

Get a Superior, Transgo or Ratio Tek ( made by the Son of TransGo, Its a nice kit that shifts awesome! )

 

I have never heard of Superior, Transgo or the other shift kits ppl post on here . I have always used TCI and its worked for me with no problems