I have a clients GTC we are restoring. As we are assembling the car, all components are restored and run before installation - which leaves me to the AC evaporator box in the car. Bench testing it after we disassembled it and reassembly - i believe the blower motor has a vibration at high speed that i cannot get rid of. With the vibration obviously more noisy than what i expect, so in the car, i pretty sure i would not like it. Taking it apart 4-5 times trying to isolate the vibration - im considering to replace the DC blower motor - it has 2 shafts on both ends and the only number on the motor is 5577 FH 12V 235 It measure 2 15/16 diameter, motor housing 3 1/4 and end to end with shafts is 8 inches. Any thoughts on what and where to get this. I searched all over but not having any idea on the speed of the motor etc, im running into WTF. Any thoughts - anyone replace one of these?