On every cold start after I try to let the car warm up a bit there is a definite clunk in the front end when I put the car in reverse from park.

It doesn't do it hardly at all if I go from park to drive.

When the car is fully warmed up and the engine has reached its normal idle rpm the car shifts into reverse with hardly any clunk at all. Now, is this just due to the higher idle rpm's from the cold starts?

Would this be a transmission or engine mount problem?

thanks...