4-speed chatter problem

440nika said
Hey guys, I installed a 4-speed in my 70 dart with a 440 motor. I can not pull the car out in 1st gear after the car is hot without a vibration so bad in the car you'd think the windows are going to pop out. You can pull the car out in 2nd gear if ya slip the clutch without the vibration. I am working on this project with qualified mopar guys who have done a few of these BB 4-speed conversions in the past including bouncing things off Wayne brewer on a daily basis. This just seems to be one of them issues that nobody can put a definite finger on yet. All the parts (clutch, pressure plate, flywheel) was purchased from brewers performance. Wayne also replaced the 1st ceramic clutch and pressure plate with an new organic clutch and new pressure plate and I got the exact same problem. I also had the flywheel cut which was out less then .002 thousands to eliminate that possibility. Any knowledgable advise/options would be greatly appreciated. I hope I'm just overlooking something obvious but it's starting to get a little frustrating. You can reply here or drop me an email at [email protected]. Thanks Dave..

Stupid question: is your pilot bushing/bearing installed?

Someone may have asked elsewhere already, but was the runnout checked? If your bell housing and input shaft aren't centered to the crank, you'll have this issue. I lost an alignment dowel on a car once during install and it did this until the clutch couldn't take it anymore.. No fun.

If you're handy with a dial indicator you should be able to measure fairly easy, but the trans has to come off the bell.

It's also possible the bore in the bell and the locating ring on the trans are not the same size and allowing misalignment.