Bill

They'll whip it if you got a good front end man on it. There are many things that can cause it but most frequently tires get it started, then looseness somewhere else allows it to accelerate. Pickup trucks are especially susceptable. You may end up with a steering damper before it's over because you are stressing out the Monte a bit with the heavier truck. One of my best mechanics is looking over my shoulder right now, reminding me that the last couple civlian type vehicles we addressed here were a combination of several things when the shimmy is especially violent.

'Fenders

This is what the thought is now. IT IS NOT THE FRONT IT IS THE REAR. Because the rear leaf have been softened the axle when slowing is rolling the axle down to the point the pinion angle gets critical and bind the drive shaft. The guy that runs the shop is a dirt track racer. They run the exact same front and rear end that is under my truck. They do put heavier coils under the front. This one has me thinking they maybe right because everything under the front checks out. Its Miller time.


Bill

Bill

I suppose it's possible. I would think the driveshaft would have to be in a severe bind. Shafts usually just drive you nuts with vibration.

BTW, wer're sure we have the correct flexplate on this 302 right?

'fenders

flexplate? i may know this part by another name, but not by flexplate.


Bill

Bill

A flexplate is what you call the flywheel for an automatic transmission. The wrong plate on a 302 causes a severe vibration. especially if you rev the engine. However it will do it even if the truck is not moving. I shouldn't have brought it up at this time.

'Fenders
Yea I know it as a flywheel. This is the first automatic I have dealt with in my life.
The rear springs have had U bolts put on them to pull the back end down, we think this may be the start of the problem. I will be on the road Tuesday so the shop will remove the u bolts and drive it. If no change we will go to 800 lbs coils in the front.

Phyliss and I were in Pigeon Forge this weekend, got the names of a lot of hotels on the parkway that would be good for PF 2004.

I will keep you advised on the progress next week.

Bill

"The rear springs have had U bolts put on them to pull the back end down, we think this may be the start of the problem."

Oh, you didn't tell us it's got a homebrew slammy it. Check the leaf spring eye bushings while you're at it. The last shimmy truck I fixed was a bad tire and bad spring eye bushing combo. It was front springs on this truck but the theory is the same.