I have a 1982 manufactured Whirlpool Imperial Seventy gas dryer. I have respect for any appliance that has lasted 35 years and will sooner repair it if possible than buy a new one that may not last three years. One of the roller bearings the drum rides on appeared to have gotten tight over time to the point where it must have overloaded the main motor until it finally burned out. I ended up replacing both roller bearings, the drive belt, and the main motor.
The most complex part was the main motor, since it does not have a simple harness connection as with newer dryers, but individual connections to terminals on the motor switch. Also, the thermal overload switch on modern dryers is jumpered to a spare terminal on the motor switch so it can be connected to the dryer wiring as part of the harness; in older dryers, it is a separate connection. By keeping track of where the wires went (the terminals on both the old and new motor are numbered), and using some helpful instructions I found in a repair forum, I was able to complete the repair successfully. Another thing to keep in mind - the shaft of the motor is connected to the blower wheel at the back end. Use an adjustable wrench to hold the blower wheel in place and a 7/16" wrench to rotate the motor shaft clockwise at the front (pulley) end to unthread the wheel. Since the blower wheel is made of plastic, you need to be careful not to use something that has a rough surface to avoid stripping it. The dryer now runs smoothly, and while I don't anticipate that this new motor will last 35 years, it will be worth my time if it lasts five.
The parts I ordered from Appliance Parts Pros were sent promptly. I paid for two day shipping and they arrived in one. I would order from them again.