ok i dono if this is a tuning issue or not but here it goes..

i have a stock cam and a baby fuddle stall and at about 40mph crusing my car seems to buck a lil bit..and like theres slack in the driveterrain(sp) is there something wrong with my stall, tranny or just need to tweak my tune a lil? thanx

 

I just installed a Fuddle in my LT1, and I am having an issue kind of like you are describing.

 

Is this happening while it's locked up and cruising under light load? If so, you can fix that with tuning. I've had to raise lockup mph points on a few cars to avoid bucking at low rpms when locked.