I am working on a trade for a 2002 GMC 2500 4x4 with auto and 6.0L motor, 230,000 miles. I drove it today and it ran good, no smoke, tranny shifted ok, 4x4 worked, ran down the hwy at 80 mph ok.
Now the questions: when I go from park into drive it takes a slow count to 4 or 5 before it does anything, put it in reverse and it goes right in.
A/c is cold but no air volume coming out of vents.
When I got off the freeway and onto surface streets when I let off the gas there was a terrible shudder, give it a little gas and no shudder. When I drove it around before getting on the freeway it did not do this.
I put it in 4x4 on pavement long enough to feel that the 4x4 was working then straightened out the wheels and could not get it from 4 hi to 2 hi. The guy with me reached over and pulled as hard as he could and finally got it to go into 2 wheel drive.
Any and all help would be great. Stupid me forgot to pull the motor and tranny dipsticks. The truck belonged to Clark County before this guy got it at auction.