In this picture, what front springs/setup are you running? I'm sure its ruf, but is the front hanger moved forward at all or are the spring perches drilled to move the axle any further forward? Or is the axle just the standard 2" further forward from stock with the ruf swap? I am working on an 82 right now and doing ruf, but debating on moving the hanger forward another 1-1.5" and i have the perches with center/.5"back/.5"forward holes drilled which would allow me to run the axle 3"/3.5"/4" forward depending on what hole i use in the spring perch. I am wanting to run 37's as well and i think yours looks about right as far as having the axle forward to where it wont rub when stuffed.
Thanks