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!
Four time Baja 1000 winner, four time Baja 500 winner. Solo'ed the Baja 1000 to LaPaz/Cabo twice.
4-Wheeling since 1972, Desert Racing since 1989.