A TH 400 has an electric kickdown- - - -not a cable. The TH 350 has a kickdown band that applies only if the cable is used, but I think the 400 works the same way with the manual valve as it does with the switch.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!