4L60E Third gear with high hp?
The shape of the input drum will tend to cause the 3/4 clutches to apply the clutches in high rpm situations when it is not in 3rd or 4th. The 2/3 shift is one of the most complicated shifts there is. There is a certain "choreography" or timing of events that must take place so that the clutches are not abused.
Lot's of builders claim to be able to build a 60e for high horsepower combinations, but they fall way short. Thats why these transmissions get a bad name. There are even some sponsors here that struggle with it and havve a high warranty return rate because they do not understand the unit.
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