The backup truck at my buddies company is a manual cummins 3500. The thing has 245k on it and hasnt had many problems, even with the tranny. May just be good luck I guess. I had to plow with it one storm and its not a very fun night. After the first 2-3 hours I was fine, but I sat in the truck for 14 hours and my leg was shot. Manuals are alot more fun in all other situations it seems though!