Here is the car info 71 grabber 351w motor C4 trany tci converter I've had this viration for a while now. So here is what is going on. The car has a pulsing vibration going around 50 or so. I know I have a bad wheel bearing in the rear.but if u put it. Into neutral. It goes away. If you Rev the motor to about that rpm it vibrates. But it's A constant vibration it does this in park also. Can it be the transmission or converter? I know the motor is done Right. Has a new flexplate and dampener I've taken it to several people no one has any idea what it is I've heard the motor. Ujoints tyranny bearings everything please help
I checked the wiring and I'm sure I wires it right. Line the rotor to the #1 post and wire counterclockwise. Under load its and really fast vibration. Shakes the whole car.
the flex plate could be the wrong imbalance for the motor. the conveter may not be properly balanced? was the vibration there before you swaped those?
I got them because the motor didn't have one and the tyranny is a rebuild one with anfter market stall.I bought them all new and it has always been like this. I had an aid and it didn't do it so I'm thinking the teanny or converter is the problem but I don't know for sure. Also found the tranny leaks out of the rear somewhere the mount. Is dripping.
The vibration is there at 50 mph, goes away in nuetral as the rpm drops, is there when you rev it to the same rpm in park. It can't be the driveline - it doesn't turn in park. It is rare to have a converter out of balance - but it could happen. Did you buy the balancer and flexplate at the same time? Are you sure they are the right balance for your engine? Cranks can be one of two balance types, balancers are made for either one ans flexplates are made for either one. All three have to match or you get a vibration.
I think paul is right on the money here, I would check into this first and go from there. Stop driving it until you verify all the balnces are correct, or you will have bigger problems on your hands quick.
I've had... 1-bad vibrating converter right out of the box. 1-wrong balance flexplate. and a whole bunch of other shaking stuff...(U-joints, tailshaft bushings, ETC, ETC.)...
I know the flex plate is correct its a b&m 28oz. I never knew the converter had to be balanced, I don't know anything about it besides its a tci
Since it is a TCI converter I will say that IT may be the problem. They have had problems with QC for the last year or more. I have heard of two converters that the snouts were welded on crooked and they wobbled because of that. Normally I would ask you to check the crank numbers and the numbers on the balancer and the flex plate to make sure they all matched. Converters are supposed to be balanced to zero imbalance - so they can be replaced without worrying about balancing the converter. If they are not well balanced or if they have run-out they could cause vibration.
