Author Topic: Rack & Pinion w/ Factory K & LCA  (Read 1232 times)

Offline 3D

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Rack & Pinion w/ Factory K & LCA
« on: August 23, 2015 - 11:03:33 PM »
Just curious if anyone is running rack and pinion steering with a factory K member and stock lower control arms???
I'm looking at modifying my K member to run front steer spindles as opposed to the factory rear steer, but it looks like the strut rod could be in the way....




Offline Chryco Psycho

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Re: Rack & Pinion w/ Factory K & LCA
« Reply #1 on: August 25, 2015 - 12:10:31 AM »
This is very problematic to do , the lower ball joint is simply designed for rear steer & even though it can be bolted on in reverse with the tie rod end forward  the ackerman is screwed doing this as the outer tire will turn in more than the inner tire making it nearly impossible to steer so the tie rod pivot has to be moved outside the ball joint into the wheel  & I have found no good way to do this & there is no aftermarket conversion parts that have solved this including RMS . All rack systems I have seen also reduce the turning radius , so we need some one to create a lower ball joint with the correct tierod end position to solve the ackerman steering angles

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Offline HP2

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Re: Rack & Pinion w/ Factory K & LCA
« Reply #2 on: August 25, 2015 - 09:29:21 AM »
Yes the strut rod is in the way and it is more complex an install than a simple K frame modification.  As CP points out, there are some considerable geometry changes with the layout aside from the actual fitting of the unit to the car. Ackerman angles, bump steer, and turning radius are all concerns that seem to appear with R&P conversions and no one has developed a simple bolt on way of addressing them. They can be addressed but may require an alternate lower control arm that allows ball joints with bolt on fabricated steering arms to restore correct geometry and then you would need to reverse the strut so it is rear mounted and not interfering with the front steer system.

Offline 3D

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Re: Rack & Pinion w/ Factory K & LCA
« Reply #3 on: August 25, 2015 - 11:15:05 AM »
I am using Viper rims on my project, which use the 6 x 4.5" bolt pattern.
I have done a lot of research on using the Dakota/Durango front end parts. looks like a 1994 Dakota two wheel drive spindle, ball joint & rack MIGHT work for my application (I have found all these parts at the local auto wrecker).
problem I'm having is the strut rod looks like it will interfere with the tie rods on the rack.
I'm actually thinking of fabricating a new LCA using the stock LCA, removing the strut rod and adding a front pivot (same as stock). I have several lower control arms and K frames to work with.
Basically the new LCA will slide in from the back like stock with two pivot points.
« Last Edit: August 25, 2015 - 11:19:22 AM by 3D »

Offline Chryco Psycho

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Re: Rack & Pinion w/ Factory K & LCA
« Reply #4 on: August 25, 2015 - 10:15:01 PM »
Not out of reach out of reach to modify the strut so it goes over or under the tie rods or relocating the pivot point

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