parallel 4 link question

I am doing a parallel 4 bar install on my truck. I have the truck set at the ride height I am looking for. It is a little higher in the back. The truck is sitting on a level surface now (home made frame tabel). The question is do I set the 4 bars parallel to the ground (frame table) or Parallel with the rake of the truck. Thanks...

 

Parallel at ride height is what I do.My 2 cents

 

Parallel to the ground at ride height. You definetely do not want the lowers pointing downhill under acceleration.

 

Another vote for parallel to the ground at ride height.

 

One more time for parallel to the ground at ride height.

Frank

 

Have got to set it at the frame table if it is level or your dis will be pointing up and not down 2 to 4 degree's is the norm just my two cents.

 

Thanks every one. Hopefully I get it all tacked together over the weekend.

 

... What?

 

what do you mean by parallel 4-link? Parallel side to side or top to bottom.?

Parallel top to bottom is better described as a 4-bar. That could be either way, but preferably in line with the ch***is to stay neutral.
A 4-link generally is only parallel side to side. The angle of the top versus the angle of the bottom determines where the instant center will be for weight transfer. You could wind up nose down on both if the installed height is too high, but generally, the bottom bar is flat with the ch***is or nose up. When you get this serious, you don't often find rake in the ch***is.
If none of this is making sense to you, stay in the realm of 4-bar installs with the bars flat with the ch***is.

Here's a link where we got into some of the forces involved...
http://www.jalopyjournal.com/forum/showthread.php?t=194450&highlight=instant+center

 

What I am trying to say is that the top bar should be close to flate and the bottom bar should have a little nose down on the forward side. I am not sure about a truck but on my coupe I wanted the CG to be pretty forward so I would still have a good beat of wight on the nose so it would not push the nose in the corners.

Now in my race car I had a 4 link not 4 bar and the CG all most at my seat and had good weight transfer with the top bar forward end down in the 3 hole and the botom bar forward end level with the frame and the back end a little down the open the back of the 4 link.

 

...What?

 

Thanks guys. It is a 4 bar install scotty (parallel top to bottom). I got a suicide doors 4 bar for it . I will be putting bags behind the axle. I will not be racing with it just the occasional burnouts and messing around ,but nothing serious.... Thanks