Ok first off i got an 88 suburban 6.5 diesel 4x4 automatic and my tranny wont get out of first gear. When i bought the truck there was a problem with the tranny but i was able to get out of first gear and into second. One day i decided to take it to a car wash and i get on the road and cant get out of first. It just happened overnight. Now when i got the truck it had been sitting for 2 years. When i drove it I would have to pretty much redline the rpm, let off the gas, then it would slip into second gear. A year later and it doesnt switch at all. I dont know anything about trannys so any help is greatly appreciated.