Shimmy when topless.

cs_88 · Jun 27, 2010

I find this kind of interesting, last summer after I took the hard top off I started noticing a shimmy at 55-60 mph, nothing horrible but definitely noticeable. When I reinstalled the top last fall I noticed the shimmy was gone, with the top on there is no problem. So I get around to taking the top back off this weekend, and sure enough it's back, at right about 55-60 mph. Anybody experienced anything like this?

jdcone · Jun 27, 2010

Toss a few sand bags in while the top is off. It might just be a weight issue, but it sshouldn't happen non the less.

Ohio Bronco 21 · Jun 27, 2010

Im thinking it is the weight issue. Without the Hardtops these Broncos loose a lot of weight.

Smokeater11 · Jun 27, 2010

I know this is a funny concept to consider with a Bronco but there is a significant amount of aerodynamic downforce loss with the removal of the hardtop. That's a lot of flat surface area on the roof and side that's missing resulting in a loss of downforce. Downforce = weight, but not only in the actual weight on the top but the weight of the air pushing down on it.

I think I might be watching too much Nascar.........;D

broncnaz · Jun 27, 2010

Could be a pinion angle issue when the top if off especailly if you have a lift. Or maybe the u joints are just worn.

Broncobowsher · Jun 27, 2010

Less weight, sits higher, caster goes away. Probably just on the borderline and the weight of the hardtop is all it takes to cross it.

jpopsbronco · Jun 28, 2010

what he said ^

I have death wobble with empty jerry can/no spare %)

ochretoe · Jun 28, 2010

Man. I hoping for a video of some big breasts shimming in a bronco. Guess I should have figured. Its not the perv thread.

00gyrhed · Jun 28, 2010

thats the ticket

Broncobowsher said:
Less weight, sits higher, caster goes away. Probably just on the borderline and the weight of the hardtop is all it takes to cross it.

Your caster is changing because the rear end isn't dragging with the top off.

I didn't notice it while driving but it definately flat tows a little differently.

Chief Master Sergeant · Jun 28, 2010

I had the same thing happen last week. It had a noticeable shake to it with the top off. I thought I may have slung a weight and got a tire out of balance, but now... I plan to throw the top back on in the next day or two and will let you know if it stopped.

cs_88 · Jun 28, 2010

This is interesting, I never thought that losing that extra couple hundred pounds could actually affect castor, but then I'm not carrying my spare right now either.
I guess mabey I'll wait and see if it gets any worse.

Chief Master Sergeant · Jun 28, 2010

Put the top back on, shimmy went away. Crazy!

markperry · Jun 29, 2010

Sounds like adding the sand bags was good advice!

cs_88 · Jun 29, 2010

markperry said:
Sounds like adding the sand bags was good advice!

Yeah but my 302 loves losing that weight.

SteveL · Jun 29, 2010

it's your bronco wagging its tail after you took that heavy, noisy top off.

markperry · Jun 29, 2010

cs_88 said:
Yeah but my 302 loves losing that weight.

So does my wife but it never seems too happen:-X

Shimmy when topless.

cs_88

Bronco Guru

jdcone

Sr. Member

Ohio Bronco 21

Bronco Guru

Smokeater11

Bronco Guru

broncnaz

Bronco Guru

Broncobowsher

Total hack

jpopsbronco

Full Member

ochretoe

Sr. Member

00gyrhed

Bronco Guru

Chief Master Sergeant

Retired U.S. Air Force

cs_88

Bronco Guru

Chief Master Sergeant

Retired U.S. Air Force

markperry

Bronco Guru

cs_88

Bronco Guru

SteveL

Huge chevy guy

markperry

Bronco Guru

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