In 2WD HI the old truck with the 750 motor had enough torque to spin the tires. The leaf springs would wrap up and this caused the rearend to hop. Hopping is hard on parts and generally breaks stuff.
I've not messed with the new truck with the 540 so I don't know if it has the same issue.
Take them off and drive it. If the rear hops put them back on.
Last edited by john01374; 10-09-2013 at 10:05 AM.