Hi there, I heard that mods may be needed on the exhaust and driveshaft if installing this kit, True?  

have you bought the kit already???  

Yes, but wasn't told about this until after purchase.  

well i checked the directions on procomps website and i didnt see anything  

yeah, Ive heard nothin about it either. Thanks for your efforts, take care.  

ok form what i found only the 2004 models needed a 1inch shorter Drive shaft.  and if you do need a exhaust mod it would be cheap  

You're awesome dude!  

Rawkon:
ok form what i found only the 2004 models needed a 1inch shorter Drive shaft.  and if you do need a exhaust mod it would be cheap

A few things here, one with a lift you sometimes need a longer drive shaft not shorter because when you lower differentials you extend the reach of the shaft. Also with a 6 inch lift it is advisable to install a CV in front drive shaft because of drive angle. Also be advised that lifts the use spacer block in rear can produce spring wrapup and traction/wheel hop issue and blocks more than a 2 inches or so should be avoided.  

Im just going by what procomp online directions say for that lift kit.  
for this GMC it utilizes coils in the rear and a multi link rear setup.  no blocks

"NOTE: 2004 models with traction control and Borg Warner transfer case
4482 require pro comp driveshaft 51246 to be shortened by 1”. Driveshaft
modifications should only be performed by a certified driveline shop."

http://www.explorerprocomp.com/PDFs/is/51022.pdf

It sounds like to me they supply a driveshaft for the 2004 model and it needs to be shortened for it to work properly.  

The auto trac Tcase has a shorter front drive shaft because of different length of output yoke. It sounds like they have a bad fix for this in that they want you to buy their longer drive shaft for conventional 4x4 and then have it shortened. It would be batter and cheaper to have current drive shaft modified than buy a new on and pay to modify it.  

yeaaa thats procomp for ya.  i try and stay away from them. and i woulda warned him but he already bought it.  he shouldnt have to worry about the Dshaft though since its a 01