Low engine "Growl"

We just purchased a 2002 F-250 supercab 4x4 and are encountering a strange engine "growl" when the truck is warmed up and and shifts into gear between 45-55mph. This usually happens when the RPMs drop after shifting. The mechanics at the dealership seem perplexed. (thank god for warrenties) Would anyone have any idea what that could be.

lc :confused:

An engine growl eh... that's odd. I can make a few calls on your behalf and see if i can't help you figure what it is. Is your F250 a diesel or gas?

does sounds like a fan clutch growl????

ervinj

I have a similar truck with V10, always has a deep growl at low RPMs, but that is just from the power of the motor. Sure your growl is not just the deep exhaust?

I have a 2002 F-250 gas and I have the same noise when it goes into OD. If I turn the OD off it doesn't do it. It just seems like the OD shifts too soon or the OD gear is too low. I'm just guessing but I do want to find out.