HOLY CRAP!!!
I have been having some frustrating times trying to work on this buggy. First off work has been crazy, I have been working prety much nonstop for the past few weeks. I have also been busy drawing up plate work for my front uprights, rear uprights and the break pedal and box assembelys. It might not sound like much to some of you but when you are as crappy on the computer as I am it"s a lot of work.
Well this is the frustrating part. I finaly had everything drawn up and my computer crashed. 
:oYep! You guessed it! The stuff that I had just drawn up was gone 
. The computer was still on warrenty, but what a fight with the company to get it fixed. Finaly got it fixed and the parts all drawn up again. As I was drawing I coppied each peice to my memory stick. What a HUGE pain in the A$$. At least I learned something out of the whole thing and that was to save parts as you make them. It was a very frustrating learning experience that I hope I will never have to do again.
Now I need to figure out what other plate work I need and get the file sent out to the laser cutter and get on with this build.
Sorry to hear that.
It is always faster drawing something the second time though. BTDT
For my rear upright pivot point (where the rear a arms attaches to the rear uprights) Is a 2.25" wide attachment point sufficient. It will be an equal length a arm design. They will be 16.375" from inner pivot point to outer pivot point. Crush sleeve and delrin bushings, both inner and outer pivot points. I hope this makes scence.
Are you talking 2.25 from front to rear? What are you using for pivots?
So this 2.25" separation controls the toe of the rear tires under acceleration and braking? If this is the case I don't think it enough separation no matter what bearings you use they won't last long. I would guess the Cudas have 4-5" of separation and there are documented problems with various fixes.
Also are you using both the upper and lower arm to control the toe or just one?
