Car shift aggressively from 1st to 2nd
You can take the pan off and access the 1-2 accumulator.
Inside a stock one there should be a piston with two springs under it.
With a B&M kit there will be a piston with aluminum spacers limiting it's movement.
With a TransGo shift kit there will be a spring on each side of the piston and maybe 1 to 3 big washers in the bottom of the housing.
It could also have a check ball stuck in the valve body for 2nd.
It could be jacked up line pressure from a bad tune.
Thats a start.


