i have a1997 dodge ram 1500 and i changed the oil pan gasket cause it was leaking and i put it all back together and new oil and filter and now it knocks when i start it up after it cools down it never did it before and i just don't understand why now

 

Dry starts..... Can you tell what flavor of knock? Rod or Main? Other?

 

is it a temporary knock or a permanent knock?
when i replaced my oil pump i put the dust cover on wrong and the flex plate hit it, causing a permanent knock. redoing the dust cover correctly fixed it.

 

no it goes away about 15 min of driving it but it sounds like it is coming from underneath i put a senthetic blend it i don't know if that would cause that or not it is a steady knock then it kinda makes a gurgling knock but when i put it in gear its not has bad or stops but park its there until it warms up

 

could anything have happened to the oil pickup tube during the oil pan gasket change?

 

there is always that possiblity but why would it go away after it warms up

 

What's the oil pressure at when you start it and after it warms up? How many miles on the engine? If I read your post right it's quieter under load (in gear) and louder when not (in park)?

 

it reads a little past 40 on start and about half way between 0 and 40 it has 160000 miles and it is quiter under load

 

Is the oil level up to snuff? Pressure should go UP with RPM, especially with a new oil pump.

Whats the pressure at idle when warm?

 

Sounds like an oil delivery problem if oil pressure drops with higher RPM's.