>>28584550
I have a 20+ year old 5-speed that has additional second and third gears called 2.5th and 3.5th even in factory docs lol
Used only when downshifting from 5th, the 4th is ignored.
>>28584699
Power glides are similar to a hydraulic clutch.
I don't believe they have any physical gears that can break.
99% of drag guys use TH400/80E variants these days though.
>>28584489 (OP)
Maybe for a race or performance application. In the real world anything less than 6 speeds sucks ass. 4 speeds either leave you doing 4k rpm down the highway or they have super tall and long gears that require too much downshifting on the highway. A 5 speed isn't much better.
>>28589402
Depends on the highway speed you usually drive at and your engine. If that's 120-130 kph, you'll be fine with 4 or 5 spd at 2.5k RPM or even lower.