94 f150 knocks when cold then goes away at operating temperature.

[Redtruck]

I have a 94 f150 with a 302 that has 245,000 miles and has been making a knocking sound only when cold. When the truck is warm the sound disappears. The sound seems to be coming from the bell housing. It is not loose flexplate nuts or a cracked flexplate already checked and replaced. It has been making this noise for about 40,000 miles and hasnt seemed to have gotten any worse. I checked for rod knock by grounding each individual cylinder and knock is still there. Truck runs perfectly fine uses about a quart of oil every 1200-1500 miles no leaks been using 10w 40 valvoline maxlife since about 200,000 miles for the oil consumption which hasnt seemed to increased much since.