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Author Topic:   Pull Bar/Lift Arm/Whatever it's Called
smayo964
Member
posted October 04, 2001 04:00 PM
Just picked up a 94 DW4 chassis and I'm in the attempts of learning the rear suspesion geometry. I've heard/read talks of long vs. short pull bars, or the lift bar, or lift arm. I believe these are all the same member, either spring loaded or with bisquits. My question in seeking knowledge is, can you use a solid rod with heim joints instead of the bisquits and springs? What purpose is there in letting the rearend roll if you are counting on body roll for helping in rear stear, etc? Or, am I confusing the (2) issues together where as they serve their own purpose. Someone educate this dumb pollock. hahahaha


jammin
Administrator
posted October 05, 2001 01:29 PM
The lift arm is a device that normally uses a spring and extends from the rear end and extends to the front of the car at basically a level. A pull bar generally extends down from the rearend tower down to the chassis and sometimes has busquits, springs or whatever to soften the lift of the car under acceleration(spring does the same thing on the lift bar). You could put a straight bar in the place of it generally and it would fit. The lift arm lifts up at the center of the car and the pull bar pulls up car at the center on acceleration. Hope this helps somewhat.

jammin


smayo964
Member
posted October 06, 2001 09:34 AM
thanx jammin. That does shine some light for me. When people talk about pinion angle, is the rearend rolling downward or upward under acceleration? Is is common to run the lift bar without bisquits or spings? Why would you soften the lift? Doesn't using bisquits and springs let the rear end roll? Just trying to get a handle here. Really appreciating all the info. Thanx.


jammin
Administrator
posted October 06, 2001 12:42 PM
The rear end rotates upward on acceleration and puts pressure on the lift bar or pull bar, the springs or bisquits act as a sponge on the contact patch to keep the tires from breaking loose...The lighter the springs are, the more they will forgive.

jammin

6x
Member
posted October 07, 2001 10:40 AM
That is going to depend on the angle of the bar. If your pulling from farther up front(longer bar) you can run a heavier spring.....but if you pull from toward the rear(shorter bar) then you can run a lighter spring.


jammin


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