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Old 02-11-2015, 01:12 PM   #1
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Lifts and the RCS system

Am curious if there are problems with some lifts and RCS system on newer vans. I have a 2011 e350 with RCS and just put on 265/70/17 wheels and was thinking of doing maxlift or moog springs. Van is already sitting taller from the tires ( doesnt rub at all)and going 2 more inches will the rcs system react to the lift? Or has anyone experianced any problems with that set up in newer e350's?

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Old 02-11-2015, 06:19 PM   #2
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Re: Lifts and the RCS system

As long as you don't pit a lift on it that requires a different pitman arm you'll be fine!
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Old 02-11-2015, 07:41 PM   #3
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Re: Lifts and the RCS system

I can't speak for any 2wd lifts but our 4x4 swap gets a longer pitman arm with 6" lifts and we've got a lot of functioning RSC vans running around.
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Old 02-12-2015, 06:11 PM   #4
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Re: Lifts and the RCS system

I have a 4WD conversion E350 with RSC (2008) with about 3" of lift and 285/70-17 tires, no RSC issues.

If you go with an Action Van lift kit, there is a special pittman arm for RSC equipped vans.
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Old 02-12-2015, 10:56 PM   #5
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Re: Lifts and the RCS system

The 2wd lift the OP is considering will not result in any problems or require a different pitman arm - there should be no problems. Initial alignment will be your biggest concern.

On the subject of RSC and pitman arm length:

RSC compares the driver's intended direction (determined through the measured degrees of steering wheel angle) to the vehicle's actual direction (determined through measured lateral acceleration, vehicle rotation (yaw), and individual road wheel speeds).

The issue with extended pitman arms is the relationship between the steering wheel angle and the actual steering input is changed. The same degrees of steering wheel movement, results in a greater steering input with a longer pitman arm. Where 20 degrees of steering wheel rotation with a stock length pitman arm may result in X degrees of actual turn, the longer pitman arm may result in 2X degrees of turn.

If the system senses that you are going around a turn that requires a certain degree of steering wheel angle, but because you have a longer pitman arm it only measures a fraction of that anticipated steering wheel angle, it will think that you are outside the parameters (out of control) and will activate the RSC system functions. It gets confused because the steering inputs doesn't match the result.

The reasons Ujoint's longer pitman arm works in his 4x4 system, is that it is matched with the rest of the steering components, primarily the length of the steering arms on the steering knuckles; all working together to produce a result that falls within the RSC's acceptable parameters.

Action Vans has also found one that works with their system.

We too have different pitman arms for different configurations.

If you have the wrong one - you will know it right away!
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Old 02-13-2015, 09:26 AM   #6
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Re: Lifts and the RCS system

Thanks for the explanation Ramsey!
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Old 02-14-2015, 07:57 AM   #7
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Re: Lifts and the RCS system

Thank you much for the info fellas. Guess I'll order the parts I need and get started.
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Old 04-09-2015, 04:35 PM   #8
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Re: Lifts and the RCS system

It seems my '06 SMB conversion has a longer than stock pitman arm--anyone know what it's from? It has Ford casting numbers BTW.

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