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Old 02-14-2005, 06:26 AM
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front end shake

Im working on s samurai jeep, converted for 1/4 mile drag, 408w C4 with 4link suspension. The problem Im having is that at 50mph the front straight axle starts to shake bad. It starts slow and quickly starts shaking worse. Its shaking to the point that it feels like the doors and windows are gonna come off. If I slow down or hit the gas hard it stops. It also doesnt do it all the time, only sometimes. It happens more on level ground then a road thats at an angle.
I also want to mention the problem started as the alignment got closer to where its supposed to be at. When the caster,camber was way off and pulled hard I didnt have this problem.
A friend of mine watched as I drove by and said the front axle is moving horizontally alot and was surprised the front axle hasent broke off yet. Everything on the front of the car is tight. I checked all kingpin bearings, rotors, shackles, steering. I bought new tires, had them balanced twice, same thing. I checked the rear end, driveshaft, transmission mount,4 links, all are good. Someone said that I needed a stabilizer bar. so I welded on mounts, and put a bar from the axle to the frame, to eliminate the back and forth movement, went for a drive, same problem. Didnt make any difference. Then they said check the tow in-out. It was set to the spec max 1/4" toe in. He said try setting it to something ridiculous and see what happens. I set it to 1" tow in and the problem 98% went away. What would cause this? Why would excessive toe in cure a shake problem. I checked the tie rod ends by hand and they seemed ok. Can tie rod ends be bad and seem ok since I can not apply the same stress to check as seem as driving it?

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Old 02-14-2005, 06:57 AM's Avatar
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Try it with toe-out. I had a 76 Chevy van that from the time it was new, would shake like that. It seemed it would only do it on one or two stretches of road. It would shake so bad, I would have to come to a complete stop. Also RxR crossings could set it off. Dealer tried about everything. Then I took it to an old established front end shop. They dialed in more caster and towed it out and it cured the thing!
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Old 02-14-2005, 07:06 AM
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Try a different set of tires and wheels..a bad wheel or tire can cause this..Go figure as to why..

I have tried most all of it and now do what is known to work..
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Old 02-14-2005, 10:30 AM
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Now that you mention it RxR crossing's do seem to set it off, and once it starts shaking, I have to just about come to a complete stop to make it stop, or hit the gas harder which is a little scary.

Im going to try new tie rod ends 1st this weekend, if it doesnt help, then I will try your suggestion with new rims.

I hope someone has some more idea's of whats going on because I want to take it to the track. Although I havent race it yet, my goals are to get into the 9's. I dont want to run at these speeds untill I know whats happening with my suspension.

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