Torsion Level Problem

Posted by Jed Sheehan On 2012/6/22 10:16:36
I'm experiencing a torsion level problem with my 56 400 and I'm hoping someone can help.

My car does what I call "porpoising." As I'm driving, the torsion system will kick in and the front will go up as far as it can and then it will go back down and the rear end will go up as high as it can. It will do this two or three times before it settles at level. Another mile or two and it will start all over again. So the car is actually going down the road like a porpoise swims through the water - up and down.

It doesn't do this all the time. It seems to happen mostly on hilly roads and at higher speeds like on the interstate. If I turn off the system the car settles all the way down in the rear so I can't even drive it with the system off. It's really no fun to drive with this problem.

I replaced the control box with a solid state unit from Packards International. I've also replaced the limit switches with a rebuilt set from Max Merritt and I replaced the compensator with a NOS unit from Kanter. Nothing has changed the "porpoising." I also replaced the three-prong brake light switch with the two prong solid state unit from packards International about 10 years ago and it has worked great.

Does anyone have any experience with this problem? Any ideas? They would be greatly appreciated. Thanks!

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