My 05 shifts better than the previous year models I've had. A Tad firm, but with no slip. My first impression when I first drove it was "It shifts really quick". The quickness of the shifts may have me believing it is firmer.
Anyway, I am going to install a Vette servo. I have heard of a new Tahoe of a later year already having a vette servo from the factory.
If one of you dealership techs have the time perhaps you can look it up and cross reference the numbers or if one is on the shelf have a look at it?
Perhaps save me some trouble.
05 , Z71 VIN's last 8 digits - 5E166198 Transmission RPO Code - M30.

 

The dealer may require the trans code # of the trans to determine the answer to your question.

 

RPO M30 4L60E

 

That is whats on every 4L60e,there is an indivdual code for each trans,go to the dealer and see if they want it,they can can take your vin and disect everything about your truck and come up with the info,the ino they need is a series of numbers ans letters.