My truck has a 4 inch on it. Check out my garage. I would go with 6 if I were you. I'm wantin' to go with an 8 inch all spring next. Mine has extra leaves in front and longer shackles with blocks in the rear. Pretty rough ridin' w/the extra springs.
01 Dodge 3500 24v
Silencer ring MIA, BHAF, straight piped lots more to come
old truck......02 F250 4wd DP,BTS,BD,AFE...... :burnout