in my TH350 I took out a spring when I installed my B&M shift kit....I removed the "granny spring", which makes it shift harsher , crisper....yes it gives it a "jerk" when shifting....cannot remember the name of the spring, but its a small one.....you may have a similar situation....Anyone buying my car at some point will have that same question maybe....unless I remember to tell him/her (If Im` still alive to tell, when my car gets sold!)