Kind of a long shot for an expert question, but about 6 years ago, I had somebody build the transmission in my 1987 Buick Grand National. He was supposed to performance parts in it. I know a little bit about engines but nothing about transmissions. The car sits all year and I take it out a few times a year.
The vehicle won't shift out of first. I first noticed it not wanting to shift under heavy acceleration but eventually it would. Now nothing. I noticed transmission fluid on the ground in droplets but it has plenty of fluid. What are the simple solutions I can start with? I don't race the car so it can't be worn out unless he sitting every year does it.