I found out first hand how erratic the tranny shifts will be with out the proper setup. Before I put my custom turnbuckle equipped rod on my Duster it would either shift too early or too late depending on where I had the pivot piece wired back. The car came without a kickdown rod but luckily the fresh tranny wasn't driven much before I got the car.

With the turnbuckle made into the rod I can make fine adjustments very easily and the car shifts great now.