I agree By not shortening it the drive line angle is that much more offset. But I have noticed there have been plenty who haven’t shortened the 27/8” and haven’t any problems. I shortened mine and used the 1/2” doctor diff offset shackles. I can fit 5” of backspace easily, i recently picked up 15x9 cop wheels with a 4.5” backspace that I plan to run the nitto’s 295/55/15’s they should fit perfect. My picture shows 6” from mounting service to the spring. I like to leave at least an 1” of space between the tire and the spring to include the inner tub for tire clearance.