I was building a TH400 at 3 a.m. last night and had the same thought. :biggrin:
I haven't spent much time looking at them yet but I will check them out when I have a chance.
The Th400 will operate with only one checkball in place near the modulator valve.
One issue you'll find here,
shift calibration is somewhat subjective, mostly opinion.
I try not to make them shift killer hard, not reason to, and doing it from 1-2 will kill the sprag.
You could omit most of the checkballs on the TH400 and with a stock plate you'll still have pretty hard shifts becuase there is no restriction at many locations.
To do good testing you would need a solid unit (fresh), a stout car, and the time (spare is hard to come by), and play with it.
You would also want a combo with a tight near stock converter, so you get a better judgement of shift feel getting progressively harder with throttle.
I know the setup I use works, and works well, and doesn't break parts.
However it would be fun to spend a day and test about 6-7 different calibrations in the same combo.
I may try it sometime on my car. '69 Chevelle, 427 BBC, variable pitch converter (very tight in low stall).
Mine is setup to the above specs.
Pre- VP setup vids:
YouTube - Chevelle
YouTube - Chevelle Video
I haven't spent much time looking at them yet but I will check them out when I have a chance.
The Th400 will operate with only one checkball in place near the modulator valve.
One issue you'll find here,
shift calibration is somewhat subjective, mostly opinion.
I try not to make them shift killer hard, not reason to, and doing it from 1-2 will kill the sprag.
You could omit most of the checkballs on the TH400 and with a stock plate you'll still have pretty hard shifts becuase there is no restriction at many locations.
To do good testing you would need a solid unit (fresh), a stout car, and the time (spare is hard to come by), and play with it.
You would also want a combo with a tight near stock converter, so you get a better judgement of shift feel getting progressively harder with throttle.
I know the setup I use works, and works well, and doesn't break parts.
However it would be fun to spend a day and test about 6-7 different calibrations in the same combo.
I may try it sometime on my car. '69 Chevelle, 427 BBC, variable pitch converter (very tight in low stall).
Mine is setup to the above specs.
Pre- VP setup vids:
YouTube - Chevelle
YouTube - Chevelle Video