I've never owned a P chassis, but as I remember they had a bell crank issue that might be your problem. I saw your other post about the tail waging the dog so it must be a concern of yours.
CLICKYON EDIT:
I'm always into doing the cheap easy stuff first, so prior to the above give the front end a good grease job. Sometimes it take a few greasing's to tighten things up. You may get lucky.