I put in a new old sm420 to replace the 3 spd that I had in my 55.1. It works fine, but I have yet to replace the floor piece that covers the tranny. In the last few weeks, it has started to make a "chirping kind of squeaking noise" that I haven't been able to locate. It seems to come from the general area of the output shaft and the U joints. It "chirps" to the beat of the revolutions of the drive shaft. When I replaced the old tranny with the sm420, I put in a junk yard drive shaft with the sliding part toward the pumpkin. I also replace all of the U joints with new. Any ideas on if I need to fix it, and if so, what it might be, and how to fix it would be appreciated.
