Thanks for diff cover info, possibility for the future, but I`ll stick with stock for now due to budgetary constraints.
So I needed to get a "rough" guesstimate for tie rod end to end length. First I strapped the axle in such a way that I could center it without compressing the springs, as you can see in some of the pics I went corner to corner at the radius arms. Needless to say it is quite important to have your axle centered during this stage
I borrowed a laser level (just a level with a laser built into it) And I put it on each knuckle pointed down. I moved the knuckle till I figured I had it set enough to make an accurate pencil mark on the floor, which when done on the opposite side would give me a measurement from knuckle face to knuckle face.
The width turned out to be 59 1/8"
To get a rough center idea at the rear I put the laser on the frame on each side and marked the floor.
Then I put the laser level back on the knuckle so it shot back towards the rear, and marked my 59 1/8 measurement on the floor, using the frame center to keep it square.
Now the knukles supposedly would be at 0* toe.
This is where Izwack helped out.
http://http://www.explorerforum.com/forums/showthread.php?t=184079
(when I say helped out I guess I mean he supplied all the math

)
I won`t duplicate all the math here, essentially if my toe-in for 35 inch tires is to be set at 3/32" , then 8 feet rearward from my front axle, the math calculates a hair over 1/2" deviation from 0* for each side.
So for my rough estimate I aligned the knuckles 1/2 inch from my 0* toe marks on each side, giving a measurement of 60 1/8" -8 feet back centered on my frame marks.
This will hopefully make any tie-rod adjustments needed minimal enough so that I don`t have to over-compensate adjustment into my final tie rod length and end up with a lot of threads left on my TREs.