Shim the K Member to modify driveline angles?

[Mike DC]

                   

In my car I raised the engine, driveline, and exhaust up into the car further, then dropped the car down as a whole.

Dropping the car down does lower both roll centers. Depending on how far you go, it can drop the front roll center to a position underground. Using taller spindles will raise the roll center back up to a reasonable location.

Pics/info on how that was done?  There isn't much room to raise everything before you hit the tunnel/floor/etc.  


When I brought up the taller spindle/BJ thing, I was thinking in terms of pairing it with a K-frame dropped by a similar amount (or less).  So it wouldn't be a taller spindle in practice.  

AFAIK just putting a taller spindle onto an otherwise unmodified front end will indeed raise the RC slightly.  

[HPP]

 I added .375" spacers below the engine mounts and .25" to the trans mount. I had to fold the flange back in the trans tunnel where it meets the floor board and it is tight to the tunnel still. When sitting on the ground, the lower control arm pivot and the lower ball joint are on level plane. Combined with 26" tall tires, the whole combo sits pretty low. I don't recall clearance of the header flange to the ground but it is tucked up a bit better than most. I've also swapped to taller spindles as well to pull the roll center back up some. 

For those that don't know, the spaced down K frame situation is what created the 3/8" taller spindle in the post '73 B body and FJM bodies compared to the earlier models. This was to create similar geometry to what was in place before. This certainly could be duplicated by any of us with the appropriate spindle. Using raised pivot upper ball joints, which are out there, you can even create a taller than stock set up.

[Mike DC]

               
The stock front RC seems very high to me, at least when the ride height is something in the range of stock or normal.  Most modern sporty cars are much lower.  

[Patronus]

If I may ask, is there an actual angle that one should be looking for in setting optimal drive line angles? If I was to put an angle finder on the trans pan, what should my angle be?