I recently purchased an 03 HD F150 wtih 103K on it. I have noticed that when I stomp on the accelorator in about 60ft it starts surging. I took it to the dealer and was told that my tranny (3rd gear) was just about gone. I was also told by another tech at the dealership to get a second opinion as the tech that looked at my truck likes to stretch things. He said either the tranny is gone or not!

I find it strange that this only occurs when I accelorate hard. Any advice would be greatly appreciated?

Thanks