Steering Shimmy on back roads, but good on highway

[CptFloridaMan]

Road crown? If you’re applying say left steering wheel input to maintain heading on a straight road but the road crown depending how curved it is your jeep will wanna follow it pretty aggressively.
If not then i misunderstood.

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[scottybue]

Road crown? If you’re applying say left steering wheel input to maintain heading on a straight road but the road crown depending how curved it is your jeep will wanna follow it pretty aggressively.
If not then i misunderstood.

I’m sure that was a part of it. The lower tire pressure seems to have dulled the effect. Having higher pressures in the tires, and the Jeep seemed to chase every wave in the road.

 

[RedundanT]

I'm wondering if part of your issue is not the "busy" steering I had before the dealer did the steering box fix. High tire pressure will make it feel flighty but at 32 you should be better. A true steering wheel shimmy though can be tire related, as in out of round, bad balance, broken belt, etc. Since the tires are relatively new I would hazard to guess it's the tires, however, I have seen new tires that would balance, but when road forced balanced would show bad. Would do alignment, get back to 6-6.5 caster, and steering box before anything else though.

 

[Headbarcode]

If it were me, I'd dial the caster down to 6-6.5°. Caster is conjoined to front pinion angle. Too much caster could possibly introduce a driveshaft vibration when in 4 hi. It could also slow down the steerings return to center after coming out of a turn. After that, check you toe-in measurement. Dialing mine down to 1/16" of total toe-in, fixed my shimmy. As tire diameter increases, so does the toe-in measurement.

 

[oceanblue2019]

Get the steering TSB done. It might not solve it, but it also could.

I've noticed when on dirt roads at speed the steering would wander more than on the highway pre-TSB. I suspect the slop in the system was just following ruts and such versus on pavement having enough caster was keeping it pointed straight.

In other words the ruts were enough to overcome the caster wanting to return to center, and the slop becoming a factor.

With the TSB this is not a problem on dirt roads at speed. But I also have way better shocks now too.

 

[scottybue]

Well noted, guys. Thanks!

 

[Notorious]

If it were me, I'd dial the caster down to 6-6.5°.

This seems to be where most members have the least amount of play in the wheel.

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