Vibration after stall

[JunkyardZ]

So installed a new 3000 rpm torque converter. noticed that the car now has a vibration starting around 1500 rpm gets worse with more gas. Car seems to drive fine and you don't notice it while getting on it hard but just with gentle throttle. I haven't drove down the highway yet but I will in a bit and let you know what happens. Feels like if you are in a truck with a bad u joint but it does it at low speed and even with the car in park. Everything with the install went good, checked clearence and all was fine. Has to be a balance issue with the converter I would think. seems kinda weird but I would think the company that built it would test for a bad imbalance.

[JunkyardZ]

So I drove it a little more and it doesn't do it at highway speeds at 2000 rpm. Taking off from a stop light with little throttle input it vibrates a little from about 1700-2100 and then when it shifts to second it goes away and then starts again, but seems to go away in third and fourth gears.

[PAT-LS101]

Similar thing happened to me with my 3600 stall. That feeling of vibration you get down low is the converter locking up. Almost like putting a 6 speed in 6th gear in town. And the parked vibration, I noticed you have longtubes? Check those. I had a parked vibration too and it turned out to be the header tapping against the somthing. They were pacesetter longtubes and everything was installed correctly.

[JunkyardZ]

It was a junk converter. They sent me a new one and it is great now. Nothing like pulling a trans on my garage floor twice. My Y pipe used to hit the floor on hard launches but I picked up a hanger/bumpstop from mufflex and it works awesome. no problems at the moment.