[Bigdav160]

There were many changes to the 700R4 through the years including the first couple. The forward sprag was improved. The input -3/4 clutch line up changed. In 1986 had a larger input shaft and a couple more vanes in the pump. 1987 was the year hydromatic did the 700R4 upgrade. They added a forward accumulator circuit to soften the shift to drive. More vanes were added to the pump. Accumulator lineup changed slightly.

Unless your building 300hp + any 700$r can be built to be dependable and work well.