PROBLEM
>2004 4.7 1500 4x4 110,000miles<
So I changed the tranny fluid last weekend and installed an airlift at the same time. Now only when the truck is cold there is a tapping (sounds like someone tapping on the floor pan towards the passenger side in front of and under the cup holder) noise that only happens while accelerating. I used Castrol ATF +4 and the level is spot on. I am stumped

 

Check for each leaks, broken head bolts.

 

I've got a huge each leak! I've had to put four whichevers in just this week.