Re: Speedometer Accuracy

Posted by Scott On 2023/3/31 10:48:19

The car is running 235/75R15 tires, which have a diameter of 28.9". The speedo reads high pretty much the same across the typical 25-60 driving range.

Do all Ultramatics have the same speedometer drive gear regardless of rear end ratio? I do know the previous owner rebuilt the transmission and had at his disposal a parts donor Clipper. (I had to remove the transmission due to an inoperative DD clutch and discovered a mismatched '55 pump and '56 plate, blocking the oil path.)