My 2001 Chevy 1500 transmission was working great then I blew the bottom line I fixed that drove it home no problems then was going to work and only had 1st an 2nd gear so I headed back home. When I got home I lost it all now it will shift fine when it's cold but I don't have anything when it gets warm. What would cause this?
I would verify your fluid level and the color and smell of your transmission fluid. But it sounds like the trans is worn. Cold, when the fluid is thicker will let it catch for a while but when the fluid warms and thins it will just slip.