O.K. I'll tell you what's the matter with this machine. In 1973 that transmission was filled with 80-90 gear lube. Now it's 50 yrs later and the lube has changed to "peanut butter" and the motor can't achieve speed against this load. New slides, new rollers, new belts, new motors...etc won't help. Personal experience from 35 yrs ago: I split the transmission, removed the stiffened grease with a putty knife as best I could, cleaned it with kerosene/ diesel fuel...whatever; added new seals & gaskets where needed, added new gear oil, reassembled and I had a new washer. That's the problem with all of the aged Maytags of that vintage. Good luck. Let me know if you take this tack...and the results