Im not sure if its a different part # or not but i do know they did a 4wd update and reset the MRC software i dont think it rides great but alot better than it was and its tolerable now because before i was ready to take it backi have a 15 ltz burb w/ MRC.
it rides firm, but great.
i have heard peeps that have MRC issues are software related.
luch1019 -
for the springs/shocks updated....diff part # than OEM?