what shift kit should I use with my new Sierra? I have searched all over the internet and all the kits say they are compatible through 02 model 4l60e. I checked out transgo, and it says they are compatible through 05 model year. I was interested in Transgo part no. 4L60E-HD2, and just wanted to know what you guys have used and what you recommend. thanks!!

 

There the 4l70e tranny and you can check for tbss tranny parts

 

Transgos hd-2 kit for the 4l60 is good for the 4l70. You just need a different boost valve. Zippy performance carries a shift kit and boost valve for this tranny as well. I put a shift kit, yank 2600 converter, and some other parts in the tranny and my 07 nbs vmax is a new beast. If you are going to do these mods I would suggest tuning your truck!

 

i will check out zippy... thanks guys!