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Old 03-23-2017, 03:19 PM
quadman's Avatar
quadman quadman is offline
Junior Fabricator
Join Date: Jul 2015
Location: Pocatello Idaho
Posts: 14
Front Wheel Shimmy

I have been building a street legal dune buggy. I later in the build found out that it would be IMPOSSIBLE to title it that way. I told the guy, "there are lots of T Buckets running around!" To this he said, "I can title one of those."

So I am building an off-road T Bucket. My question today is, I finally got it together enough for a test spin out in front of the house, and after I get it up to approx 30 mph I have a BAD front wheel shimmy. I am BUMMED! The front suspension is a 3 link with air bag support. The axle is off a 1999 Jeep Wrangler. I cut the differential out and added 5 and 1/2" to the width to match the rear axle which is a 3/4 ton GM unit. I made a jig to weld the axle back together, so I am reasonably sure the the ends are in sync with each other. I really do not know where to start. I can easily change the axle tilt, as I made the 3 link tubes with a right and left thread in each one. The 3 link tubes are equal in length. All of the tubes are DOM, with Hemi joints. I built all of the axle mounts out of 3/8 plate, so there is not likely to be any flexing of anything. I have a lot of pictures, and I will try to add them to this post.

I have been working on this for 2 years. The engine is a 396, with a 400 auto. The rear gears are 4.10 with 16" wheels. The front are 15" from the Jeep. I am using the Jeep steering gear and tie rods with a Camero power steering unit. I built everything myself. I am a retired heavy equipment mechanic. (hence the 3/8" plate mounts)

Any ideas? Thanks, Dave

PS I do not seem to understand how to download pictures, and I looked in the search area for "shimmy, and Shake" with no success.
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Old 03-23-2017, 04:58 PM
entropy's Avatar
entropy entropy is offline
Master Fabricator
Join Date: Sep 2007
Location: 95-miles from the center of Oregon.
Posts: 8,380
...to directly post pictures you must be a Member; otherwise you have to host them at a site like Photobucket and then link them.

Your situation could be any of a number of things.
Caster wold be the first thing I would check then Toe, then Camber.
Next would be to be certain that the steering is correct.

When did empirical knowledge get replaced by a theoretical education?

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Old 03-23-2017, 09:30 PM
ScooteK's Avatar
ScooteK ScooteK is offline
Master Fabricator
Join Date: Apr 2006
Location: southern california
Posts: 1,466
separated tire, tire balance, bent rim. maybe?
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Old 03-23-2017, 10:17 PM
alwaysFlOoReD's Avatar
alwaysFlOoReD alwaysFlOoReD is online now
Master Fabricator
Join Date: Jan 2010
Location: Red Deer,AB Canada
Posts: 720
I thought I read something about a death wobble on Jeeps. I've never owned a jeep so didn't pay much attention. Maybe goggle can be your friend.
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Old 03-26-2017, 10:42 PM
quadman's Avatar
quadman quadman is offline
Junior Fabricator
Join Date: Jul 2015
Location: Pocatello Idaho
Posts: 14
I fixed it!!!! WAHOO!!!

I used the steering gear adjustment to push the sector together just a little. No more play, and more importantly, no more shake!!!

Such a simple fix. I love it. Thanks for the help.
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