no, its 2wd extended cab only.
i think your problem is there is a pcm update to correct, and some models , depending on the build date, requires a p/c control solenoid. heres the bulletin:

Transmission Has a Harsh 1-2 Shift, Slipping 1-2 Shift Followed by a Harsh Engagement (Replace Pressure Control Solenoid and Reprogram PCM on Certain Models)
2003 Cadillac Escalade

2003 Chevrolet Avalanche, Silverado, Suburban, Tahoe

2003 GMC Sierra, Yukon, Yukon XL

with 4.8L or 5.3L V8 Engine and 4L60-E Automatic Transmission (RPO M30)

This bulletin is being revised to include a new vehicle production date and a revised solenoid part number. Please discard Corporate Bulletin Number 03-07-30-020B (Section 07 -- Transmission/Transaxle).

Condition
Some customers may comment about a harsh 1-2 shift, 1-2 slip shift that has a bump feeling when 2nd gear engages.

Correction
For 2003 model year vehicles produced prior to April 1, 2003, replace the Pressure Control Solenoid (PCS). Refer to the Control and Shift Solenoid Replacement procedure in the Transmission sub-section of the Service Manual (SI Document ID #825149). Also, reprogram the Powertrain Control Module (PCM).

For 2003 model year vehicles produced on or after April 1, 2003, reprogram the Powertrain Control Module (PCM

 

Chris, so can I bring this into you and you can take care of it?

 

i cant remember, yours is a gmc or chevy, if its chevy youll have to take it to a chevy dealer, we are a pontiac,buick gmc dealer. the way gm does warranty is dumb.

 

I stopped at a dealer yesterday.
they were unaware of the TSB - wondered where I got it - I didnt say
but I am going to stop by next week - drive it with a tech and let them order
the parts
Guy was pretty cool. He has a Z71 that he says he beats on.
I will keep you updated

 

Chevy, ok well i need to get my service engine soon light turned off first so they don't freak on me. thanks

 

i dont think theyll freak out, where do you plan on taking it, i think howard is decent. ive never dealt with them though. g/l

 

I have 1500 mi. on mine and something wierd happened today. As I was cruising along I got on it enough to drop it from 3rd to 2nd but when I got off the throttle it stayed in 2nd gear at about 3500 RPM and would not shift back into third. I slowed down thinking WTF and about 5 sec. later it finally shifted. Are the 4L60E's really that plagued? Makes me scared to do a tune and get rid of the Torque Managment if it wants to act up when its stock.