Lucas kept the problem at bay for 6 mos, but with really hot weather the transmission finally gave out. I had to shift back and forth from drive to neutral to get the truck to kick into gear. I drove it to a dealer and traded it in for a new truck. Got $1300 for my trade in. (I'd already tried draining the trans oil and added another bottle of Lucas, but that didn't fix the problem enough to get better performance.) Rode great to the dealer once it dropped into overdrive and got up to speed. I couldn't set to cruise though, because there were times the tranny would try to give more power going up a hill and that would cause the clutch to slip and the rpm's rev dangerously high. Was glad to be done with the mess.

Just want to toss in my $.02 on the tranny thread. My transmission has always worked well, but there has always been a slight slip between 1st and 2nd, and sometimes between 2nd and 3rd. I have the tranny serviced regularly, but the slip stays with the tranny. It's more of a slight annoyance than any other thing, but I did want to mention it FWIW.

Also, the rear main oil seal (engine) leaks slightly - I'm told that this is typical of the 5.2L engine, and that replacing the seal really doesn't help. So I just make sure to keep an eye on the oil level.