Hi guys!

I am planning my susp. mods now that I have the money. I like the roush because it comes with matched shocks, which are a major part of the equation.

I need to know if there is still is any rake left in a truck with a Roush suspension.

If there is considerable rake, then I will install only the Roush system.

If there is no rake left, then I will install some Western Chassis control arms to lower the front and thus create rake.

Will a truck with the Roush susp. and Western Chassis control arms be scraping the ground? Will I have enough front suspension travel to safely drive around? Will I have enough inner fender to allow for suspension movement?

One more question, which are higher quality, DJM control arms or Western Chassis control arms?



Thanks a million guys! I'll post some pics once its done!

 

With the Roush springs AND a Western Chasis a-arm set, you'll have about 2" of REAL front ground clearance, an almost nascar height.

Might be tough to drive daily.

Daniel

 

yeah there is rake left after installation--- after installing two inch shackles in the rear-- there is still a very slight rake of an inch perhaps...

 

And the bump steer would likely be vicious.

 

If you want to use the A-arms keep the stock coils.

 

Ok... so now here's my next question:

Stock springs and a-arms

or

Roush setup


Will there be any bump steer w/ stock springs and a-arms?

BTW, thanks guys!

 

I've been wondering that myself too, I havn't had time to see how the a-arms change the suspension geometry. If I remember, the drop comes frmo the fact that the lower-coil seat is recessed two inches deeper then the stock a-arm seat.

If you get a spring of the same weight, the "feel" will be the same, but I'm not sure how the geometry compares.


Daniel

 

I remember reading a few people on here have done the a-arms. Hopefully they will join in, cause I'm curious about that also.

 

Yes, just the same as springs alone. Bump steer is caused by the geometry between the control arm mounting points and the tie rod mounting points. If the tie rods were perfectly aligned with the control arms, there would be no steering input as the wheel moves through its arc of travel. The problem is that the relationship of these points is unchanged from the stock F150. With the Lightning, bump steer comes on. Lower the Lightning more, and more bump steer comes on.

The problem has to be addressed at one of the ends of the tie rod. Since the steetring rack can't be moved in our trucks, special tie rod ends have to be fabbed to raise the tie rod-to-spindle relationship.

Or something.

 

A picture is worth a thousand words: