Rear trac-bar shimmy?

[Broncola]

So sometimes I take speed bumps with a little speed. I’m pretty sure I’m hitting them square, but feels like the rear end does a swing out to the right. Is that just normal due to the rear trac-bar?

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[Broncotrax]

So sometimes I take speed bumps with a little speed. I’m pretty sure I’m hitting them square, but feels like the rear end does a swing out to the right. Is that just normal due to the rear trac-bar?

Make sure they didn't forget the rear track bar.
Make sure the bolts are in it.
Make sure it's tight.
There will be a little radius movement as the suspension compresses.
It's much like bump steer on the front of a solid axle unit.

 

[goatman2]

So sometimes I take speed bumps with a little speed. I’m pretty sure I’m hitting them square, but feels like the rear end does a swing out to the right. Is that just normal due to the rear trac-bar?

That track bar is very long and it's very flat, so it would be exceptionally unlikely that you can feel any side to side rear movement. Any actually movement would be VERY slight, and for only a few inches of suspension travel virtually nothing. BTW, you can take speed bumps faster if you hit them with a slight angle. Not all the kinetic energy hitting at exactly the same time.

 

[Broncola]

Yeah it is long and flat, which is why it seems weird to me. I even checked the springs out. Had the same sticker and number on the coils left and right so should be good.

That track bar is very long and it's very flat, so it would be exceptionally unlikely that you can feel any side to side rear movement. Any actually movement would be VERY slight, and for only a few inches of suspension travel virtually nothing. BTW, you can take speed bumps faster if you hit them with a slight angle. Not all the kinetic energy hitting at exactly the same time.

 

[colintrax]

Some people are more sensitive to suspension than others, you're likely noticing the axle physically moving a bit left to right along the track bars axis. Im one of the sensitive people that can feel it. Most people won't ever feel that movement though.
With that said, doesn't hurt to take it to the dealership and ask them to check the rear suspension.

 

[Broncola]

Sens-i-tive! That was one of my thoughts as well. Not much of a concern to me, but wanted to see if anyone else noticed it.

Some people are more sensitive to suspension than others, you're likely noticing the axle physically moving a bit left to right along the track bars axis. Im one of the sensitive people that can feel it. Most people won't ever feel that movement though.
With that said, doesn't hurt to take it to the dealership and ask them to check the rear suspension.

 

[grayshadow]

You should slow roll thru parking lots.

 

[Broncola]

Yes, stock base suspension.

 

[goatman2]

Please describe what you are talking about. Rear end shimmy..........meaning what? What does it feel like. This is interesting.

 

[BoMiltenberger]

I’ve got a 4 door BL Sasquatch 2.7L and wanted to see how the bronco would do at higher speeds. Made sure the road was clear then tested 25, 35 and 45 mph. All felt minimal with no shimmy. Likewise in a 2DR SAS I drove earlier this week.

 

[Hopeless Diamond]

You should slow roll thru parking lots.

You know, they call them SPEED bumps for a reason...

 

[Toffen]

So sometimes I take speed bumps with a little speed. I’m pretty sure I’m hitting them square, but feels like the rear end does a swing out to the right. Is that just normal due to the rear trac-bar?

Do you have the Goodyears?(Sasquatch)
I had the same issue when I was running the recommended 39psi.
I’m now running 35 psi and have no further issues.
Plus it rides 1000% smoother…

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