Death wobble question

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I had a death wobble on my 1997 80 . I replaced bushings, wheel bearings, tie rod ends, balanced tires, blah,blah, blah. I finally replaced the tires with Cooper stt pro 37x12.50r17's. The death wobble was gone. Everything worked great!

After 5,000 miles, I rotated my tires and the death wobble immediately returned. I'm guessing the tires need balancing.

My question... Is there something else I should check besides tire balance? Any advice is much appreciated!

Thank you!!!

Striker1-1.jpg
 

JunkCrzr89

Competent Ignoramoose
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Sounds like tires need re-balanced, Mr. Blacksmith
 
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I suggest you start reading here:


Then do a search in the upper right corner as seen
here:
1653325114222.png
 
Joined
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Messages
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www.irontonforge.com
I suggest you start reading here:


Then do a search in the upper right corner as seen
here:
View attachment 3016367

I subscribed and read this thread at least twice, maybe more. Because of this thread I replaced all bushings, tie rod ends, wheel bearings, and balanced tires, and a lot of other things I can't remember at the moment.

I'm familiar with the search box... I use it frequently. Thanks!
 
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I subscribed and read this thread at least twice, maybe more. Because of this thread I replaced all bushings, tie rod ends, wheel bearings, and balanced tires, and a lot of other things I can't remember at the moment.

I'm familiar with the search box... I use it frequently. Thanks!
When you re-did your wheel bearings, what torque did you set them?

That could be about enough miles to be a problem again if you followed the FSM to the "T".

Otherwise, I would point to the tires and balancing based on that being the change that brought it about.
 

jellis

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Get them road force balanced, Discount Tire shops typically have these machines. My Coopers were awful for DW, Nittos have been absolutely amazing and not a single weird shimmy since I threw them on and I'm 18 months in with NO rebalance yet.
 
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Pull the upper and lower bolts. Make sure the holes didn't wallow out. You can drop the pan hard rod and check bolt play. I had almost 1/4 of play in mine. Welded some thick washers to the outside. Good as new.
 
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Get them road force balanced, Discount Tire shops typically have these machines. My Coopers were awful for DW, Nittos have been absolutely amazing and not a single weird shimmy since I threw them on and I'm 18 months in with NO rebalance yet.
Thank you! I made an appointment for tomorrow.
 
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When you re-did your wheel bearings, what torque did you set them?

That could be about enough miles to be a problem again if you followed the FSM to the "T".

Otherwise, I would point to the tires and balancing based on that being the change that brought it about.
I believe the wheel bearings were torqued to 47 lbs inner and 30 lbs outer. I raised the front end and checked for slack at 12 and 6. There was no slack.

Going to discount tire tomorrow...

Thanks again!
 
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I had a groove worn into a spindle causing me issues and a steering gear box that needed rebuilt. This was after eliminating old worn bushings as the culprit.
 
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bryson

I do stuff.
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Check the frame for cracks near the steering box mount and panhard mount. Check the inner side of the frame as well as the outside. There's a couple common(ish) points where 80 frames crack.
 
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Primary cause of 'death rattles' is bad caster - factory caster is +3 degrees but if it's anything less than 1 degree it takes very little to induce harmonics that will cause suspension shake at very particular ranges of speed that depend on a bunch of things but primarily the tyre diameter and yes balance. I have experienced the death wobble/rattle myself and at 100 kph on a highway with traffic all around it's *scary* as it *will* destroy things unless immediate action is taken to 'cancel' the suspension harmonics.
 

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