Well, I think my truck finally took a sh** on me. Just today I was driving down the highway and as I'm crusing at 60mph, the tranny started to slip as I'm going. The engine was maintaining its rpms fine, but it just felt like the transmission would slip every so often. I drove about 20 minutes one way on the highway, it only acted up twice. On the drive home, it acted up twice again. Just before I turned onto the road to head back to my house, the transmission continusly felt like it was slipping. So I drove it straight to my mechanic's shop to drop it off. About 2 miles from my mechanic's shop the truck drove like crap. It pretty much felt like I took it out of gear and put it back into gear several times. I think that if I drove it any longer, the transmission wouldn't even engage. My truck is just not very reliable and I will not be spending the money on a new transmission. So I started searching online for my new truck. Its between a duramax and a cummins. Any thoughts on either of these trucks. Both trucks will be 04 and newer, extended cabs or crews and 4x4's. I really like the dmax's but I'm open to all opinions on the DURAMAX and CUMMINS. I need opinions fast, if my truck comes back with report I'm expecting, I will need a new truck SOON!!