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#2414670 - 12/07/17 10:34 AM Re: A body drag link - dropped? [Re: AndyF]
540DUSTER Offline
mopar

Registered: 12/27/03
Posts: 519
Loc: USA
bump steer alert!!!

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#2414688 - 12/07/17 11:01 AM Re: A body drag link - dropped? [Re: AndyF]
rowin4 Offline
master

Registered: 06/30/05
Posts: 6076
Loc: gulfport, ms, west mi
I don't know who might have a problem with bump steer but my Barracuda pulls the wheels in 2 gears on every run and never had a shake or direction change upon landing.
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it's ok to butt heads, just don't do it with a butthead

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#2415069 - 12/07/17 11:25 PM Re: A body drag link - dropped? [Re: rowin4]
Dave Hall Offline
top fuel

Registered: 01/21/08
Posts: 1923
Loc: Cotati, CA
There's is no way to increase bump steer with this unless you change the pitman/idler arm locations or ratios. The bend them down thing works because you are bending both ratios a close to equal amount. The drag between the two could "V" back to the rear bumper.

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#2415095 - 12/08/17 12:56 AM Re: A body drag link - dropped? [Re: AndyF]
humpty Offline
enthusiast

Registered: 10/17/07
Posts: 366
Loc: Minnesota, USA
Any concerns with bumpsteer are quickly verified by checking tow variances through the range of travel. I made the mistake of swapping to front steer rack and pinion with a modified stock k frame by an unqualified chassis builder and quickly learned the importance of performing the same check. Easy fix if it is introduced but important to verify non the less.
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72 Duster - 408ci W2, 10.18@131. Shooting for 10.0's in 2018!
https://m.youtube.com/watch?v=Q4P51j38-MI

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#2415097 - 12/08/17 01:08 AM Re: A body drag link - dropped? [Re: humpty]
Dave Hall Offline
top fuel

Registered: 01/21/08
Posts: 1923
Loc: Cotati, CA
I had this problem on the original 2X3 chassis in my Challenger. I found out that the rack needs to be level with the steering linkage at ride height. It's pretty common sense. If the rack has steering arms that connect to the spindles at down angles, what happens when the suspension is compressed? The toe goes out. There's a little more to it but pretty simple.

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#2415187 - 12/08/17 09:59 AM Re: A body drag link - dropped? [Re: AndyF]
AndyF Online   content
Too Many Posts

Registered: 01/20/03
Posts: 24185
Loc: Oregon
The center part of the center link isn't going to have any effect on bump steer but the location of the tie rod ends will. Changing over to a '73 link from a '72 link will change the tie rod end locations so that could cause a bump steer issue. That is one thing I need to verify.

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#2420446 - 12/18/17 02:40 PM Re: A body drag link - dropped? [Re: AndyF]
AndyF Online   content
Too Many Posts

Registered: 01/20/03
Posts: 24185
Loc: Oregon
So I've learned a few things since I started this thread. I pulled the front suspension out of the Duster and got it mounted up on a fixture so I could work on it. I swapped in a '73 style center link and noticed that it is longer than the '72 center link. So that moves the inner tie rod points out towards the wheels which will reduce bump steer. So the '73 style center link should be better for bump steer than the '72. I don't think I knew this before.

The '72 tie rods do bolt up to the '73 center link but there is a lot of angle on the tie rod ends since the inner taper points down and the outer taper points up.

I'm going to put the suspension back in the car and see how it looks. If the tie rod angle is too severe then I either need to modify the lower ball joints so the taper points down, or just swap over to the '73 knuckles.


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