Am experiencing some strange issues w/ stabilitrak on 2003 Denali.

Denali was upgraded by Lingenfelter w/ 500 HP performance package which includes super charger, 2800 Yank coverter, Rossler transmission, 20" wheels w/ 305/45R Pirelli Scorpion tires. I bought it 3 months ago...just had the transmission refreshed and when the ECM recalibrated the ride characteristics it changed.

My understanding of how the computer does it's magic on ride control is limited. I've ordered the GM Service manuals to help w/ my education but won't get 'em 'til next week. I've searched forums and other links I've collected and haven't found the detailed info I want/need to figure out why it is misbehaving.

When starting from a stop w/ full throttle it bucks like horse...honest. AWD grabs like a SOB initially, then some slipping of the tires (not much...there is lots of rubber on the road), when it feels the slippage it tries to compensate the way stabilitrak was meant...I presume...

I question why it may or may not be correct because it didn't do this before the transmission replacement nor when it first came off the jacks. Now 3 weeks later it won't give me smooth (very fast!!! ) start.

Any ideas? Any links you care to share?

Yes, this bad boy is fun. Mustangs should fear me!! I'll embarrass 'em at every opportunity.

Rodney