About a month ago I purchased a low mileage (33k) 1986 Cutlass Supreme 307 with 4 speed automatic. This car sat for 10 years and did a basic tune up but no fluid change on the trans as it looked fine. Yesterday I went to the local car show drove fine there but on the return drive home I noticed it would not shift into any upper gears. I havent drove this car no more than 150 miles since the purchase. I dropped the pan and the typical wear and fine particles in the pan were there. I also dropped the governor and checked the springs which were good. the only other thing I havent checked is the TV cable but am waiting on a drain plug kit to be delivered to avoid the mess of trans fluid. Any help would be appreciated .