Re: CLUNK !

Posted by Ross On 2017/6/22 20:29:46

I think you will find that the roller assy has rotated too far to the rear of the trans and now has to push the park pawl up into the parking gear in order to come back to its normal position. There is supposed to be a stop pin that keeps the roller assy from rotating too far, but in moderately abused transmissions that pin can be broken off and allow the roller to go too far and roll off the end of the parking pawl.

So the drill is: take a skinny screwdriver and push the parking pawl up into the parking gear. Rotate the driveshaft a bit to make sure the pawl engages all the way. While still holding the pawl up in place, rotate your shifter forward to any convenient gear other than park. Then till that stop pin is replaced, never ever use park again.

Mr DeLorean was a brilliant engineer, but he was also a young one at the time and had not learned that one never puts a notch in the middle of a shaft subject to any bending loads.

The modification to the manual valve described in the service counselor was an early grasp at straws to solve the various park problems. In my experience it is as futile as teats on a boar hog.

While you have your pan off, check the tightness of the setscrew holding the manual valve lever to the shaft. Make it snug but beware they strip easily. Obtain a nice fresh 1/8" drill bit and a 1/8" x 1" rollpin. Drill clean through the manual valve lever and the shaft at some convenient location and then drive in the rollpin.