BIG DAWG
Active VIP Member
i have 6.7 with smarty, dpf delete and an s&b cold air with a 6 sp manual and have found that when i run the smarty jr on the tow mode(3) my clutch will slip while pulling my 30' toyhauler if you are not gentle with the throttle on hills. i never had this issue with my 5.9 and bullydog but apperantly the 6.7 is using a dual mass flywheel and not handling the power so well. apperantly the fix is to go back to the old style clutch for around $2000 installed