shifty problem?

[dan lephart]

When cruising along between 50 - 57 mph I notice a faint (barely noticable) bucking or hunting backing and forth motion. I can't be sure it is even transmission related. My 200 4r has a shift kit, that seems to do a great job, from parts extreme. any ideas?

 

[copo]

If it coughs then I'd try someone elses mass air flow sensor. Has the TCC solnoid and 2 pressure switches ever been changed? How many miles are on the tranny? I had a slight surge on and off above 50mph. It was the TCC solnoid that wasn't keeping the tranny locked in 4th gear. I also changed the 2 pressure switches while I had the pan off plus a new tranny filter. I didn't drill out a hole for a drain plug since I found a high enough and wide enough plastic shipping box that worked for my fluid catcher. I took pics too.