Multi Power shift feature was on my MF 65Dieselmatic 1962 model, but may have started in l961. MF 65, 50, and 35 had it as an option first, then was available on 100 series models with choice of standard 6 speed or MP option. Early 70s was when 8 speedwas also available, neighbor has a 1973 175D 8 speed he bought new. MP was also an option on larger 1100 series. Have repaired a few smaller models MP in years past, usually from lack of care or low oil level which can burn Hi range clutch plates. 1100 series held up the best, have only repaired one in all my years of working around Masseys, and that was on a high houred 1150 I had for awhile and sold to my brother. 2000 series went to a 3 speed MP, have been in 5 of those and don't care to see any more. Was a good idea but when seal trouble begins and 2 cluthes try to apply at once it gets hot and seals melt. Low and Hi range clutches are applied with oil pressure, intermediate clutch is applied with spring pressure and released with oil pressure when either Lo or Hi is used. Massey went back to a 2 speed on 3000 series and had better service than 2000 series .