I had to remove my cardboard grill block in my slant six. I would get hot at stop lights. You may not have that problem with your diesel. I did notice an improvement in torque when I did the fan delete. I just changed back to cold air intake since I noticed it ran stronger in cooler air. I've also lighten it to under 4000 lbs with me in it. The slant is only 450 lbs though. I've got a 3.55 rear and an automatic with overdrive hooked to an old Chevy vacuum lockup switch. It will lock at idle if I have enough speed to be in 3rd.
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