Transmission Shift Kit

[YukonDude]

I have a 97 yukon which i am having some problems with.

I can drive around town all day and the transmission will shift great. Once i get on the highyway it still works great, but once i come to a stop after traveling at 65-70 and take off again it has neck snapping shifts. The only thing i can think is that the transmission is slipping at high speeds and the computer is trying to compensate for the slippage.

 

I've decided i'm going to try a transgo shift kit. Which kit is better the stage 1 or the stage 2. Also, does the stage 2 kit do everything the stage 1 kit does, plus just add the ability to upshift and downshift.

 

Thanks