Some weird vibrating that needs to be fixed!

OK.... I thought the vibrating could have been a wheel bearing in the front. The bearings and seals looked good. Took em both off, cleaned em with solvent and packed them. No change.

However while going down the road (somehow) I did realize that the vibration ONLY happens in 3rd gear. I can drive around all day in manual 2nd and there is no vibration. I can be at any speed or rpm in third gear, and as soon as I let off the gas, vibration. There is no vibration when the car is accelerating.

When I had the tranny at the shop a few weeks ago for a valve body troubleshoot, I had the guy put in a 5.0 to 1 kickdown lever in since it was already apart and I had one laying around. He said that if the transmission shifted prematurely from first to second and I get overlap/vibration, I should back the front band adjuster off a quarter turn and send it down the road and go from there. The shift from first to second is really very good, but obviously something is wrong with third gear.

I was going to adjust the front band today, but I'm afraid of adversely affecting my shift from 1st to 2nd. Not to mention that I'm no 727 expert, and I don't even know for sure that loosening/tightening the front band would even affect 3rd gear. Any transmission gurus out there, or has anyone here ever experienced anything similar?


:help: