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What caues death wobble?
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<blockquote data-quote="wheelinjp" data-source="post: 1448341" data-attributes="member: 15970"><p>Ok I dont see you acknowledging the trunion and wheel bearing check. so here is how to check these. </p><p></p><p>1. set the front axle on jackstands so the tires are off the ground. </p><p></p><p>2. to check trunion bearings push and pull on the top of the tire with your head in the fenderwell looking at the top of the steering knuckle. if you can see the outer knuckle moving back and forth at all from the axle housing then you have bad trunion bearings. </p><p></p><p>3. now do the same tire push and pull and if the outer knuckle doesnt move and is solid with the axlehousing then focus on the bearing hub your wheel is bolted to. If you get any shake at all then one or the other (trunion or wheel bearings) is loose. </p><p></p><p>4. after checking those if there is still a shake lay under the front and shake the tire back and forth and watch every tierod end and the steering box. sometimes you have to jack it up like this to take the weight off the bad tierod to see it is failing. </p><p></p><p>5. also retighten your u-bolts. check the center pins on the springs, and watch every part of the suspension while rocking the tire back and forth. Also do the 1-3 steps on each front tire. not just one side. </p><p></p><p>hope this helps before spending any money on stabilizers or alignments. to check caster is to check the angle the top trunion bearing centerline is leaned back from the bottom trunion bearing centerline going up and down. imagine a rod going straight through the top and bottom of the outer knuckle centered on the bearings. the top should lean back 7degrees from the bottom. google it, im sure there is a pic or diagram. that angle changes as you add leafs, or add shackles, or shims to improve d-line angle. if it is changed enough you can get death wobble and scrub steer.</p></blockquote><p></p>
[QUOTE="wheelinjp, post: 1448341, member: 15970"] Ok I dont see you acknowledging the trunion and wheel bearing check. so here is how to check these. 1. set the front axle on jackstands so the tires are off the ground. 2. to check trunion bearings push and pull on the top of the tire with your head in the fenderwell looking at the top of the steering knuckle. if you can see the outer knuckle moving back and forth at all from the axle housing then you have bad trunion bearings. 3. now do the same tire push and pull and if the outer knuckle doesnt move and is solid with the axlehousing then focus on the bearing hub your wheel is bolted to. If you get any shake at all then one or the other (trunion or wheel bearings) is loose. 4. after checking those if there is still a shake lay under the front and shake the tire back and forth and watch every tierod end and the steering box. sometimes you have to jack it up like this to take the weight off the bad tierod to see it is failing. 5. also retighten your u-bolts. check the center pins on the springs, and watch every part of the suspension while rocking the tire back and forth. Also do the 1-3 steps on each front tire. not just one side. hope this helps before spending any money on stabilizers or alignments. to check caster is to check the angle the top trunion bearing centerline is leaned back from the bottom trunion bearing centerline going up and down. imagine a rod going straight through the top and bottom of the outer knuckle centered on the bearings. the top should lean back 7degrees from the bottom. google it, im sure there is a pic or diagram. that angle changes as you add leafs, or add shackles, or shims to improve d-line angle. if it is changed enough you can get death wobble and scrub steer. [/QUOTE]
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