Vaughn, when I made new-shorter- blocks for my 4by, I shortened the "brake proportioning valve" link so as not to increase the rear braking force when driving empty. Probably there would be no problem in the summer, but the slick winter roads could cause a problem. Actually, come to think of it, lengthening it out would give more rear braking to those that are thinking of going to 3500 rear calipers at a lot less money. Hope that helps.