Assuming this happens while you are moving you probably need to replace the speedometer cable.
harmonic balancer
A 1970 Cutlass rear bumper will not fit a 1972 Cutlass without modifications. While both models share similar designs, there were changes in bumper shape and mounting points between these years. It's best to use the specific bumper designed for the 1972 model to ensure proper fit and alignment.
cowl tag for a 1972 cutlass ST 72-33687 r04303 TR949 A-51 63F 090721 what does this mean
No, you just have to have a small hand to get in back of the speedometer.
11,572
160 mph.
Turbo Hydromatic 350 or 400 I think. I have a 1973 and it started with a 350 but it was swapped for the stronger 400. the speedometer will need an adapter or it will send the wrong MPH and it will look like you are going faster than you are.
5 per wheel
First generation of Oldsmobile Cutlass went from 1964 to 1967 and the second generation of Oldsmobile Cutlass went from 1968-1972. Third Generation of Olds mobile Cutlass went from 1973-1977.
They will fit, but they will look stupid as hell. Keep in mind the 1972 Cutlass came stock with 14" or 15" wheels. Anything bigger than 18" tends to look really, REALLY stupid on older cars like the '72 Cutlass.
1,041 1972 Oldsmobile 442 Cutlass Supreme Convertibles were produced and 130 Hurst/Olds 442 Convertibles were produced for a total of 1,171.
Good Old 10/40 is best.