I'm really bad about servicing automatics. I just paid the shop $1600 last week to rebuild the 4L60 in my truck. Vehicle has 150,000 miles and had never had the pan dropped. It was still shifting good, just every once in awhile it didn't shift from 2nd to 1st when coming in for a rolling stop. Oil gets changed every 3-4k miles, but tranny's get ignored for some reason.