Kick down linkage issues

[M_Body_Coupe]

You can't really change shift points with the TV linkage. It needs to be adjusted so WOT and full pressure (TV lever all the way towards the rear) both happen at the same tine.

You can change shift points by adjusting the pressure regulator valve on the main control body. More pressure equals higher shift points, along with firmer shifts.

....but, but....there is a slight amount of adjustability that you do have in just the TV linkage, albeit it does not have the sort of impact that changing the governor weights would.

Basically, the "WOT and full pressure" setup, or alternatively, just how FAR towards the rear you set this up, will dictate at which point the governor pressure feed overcomes the TV pressure, as that will force either the 1-2 shift valve, or the 2-3 shift valve to move (this is of course dependant on which gear you are in), causing a shift to occur.

In other words: configuring that setup as @Aspen500 explained gives the highest RPM shift point for a given combo because the governor weights are not allowing enough pressure buildup aginst the TV pressure until the RPMs increase some more, and within the governor setup the weights overcome the spring force.

Some aftermarket companies still sell the various governor weights packages, these are tailored (through a matching weight and spring set) to give you a given RPM shif-point, provided that you match them up to a specific main line pressure, which itself feeds into multiple other circuits...so yeah, it's all linked together, I've studied it multiple times and concluded that this is "pure genius"!!! lol (b/c I sure as hell can't understand it all at the same time)

The FSM Transmission section does a pretty decent job of providing the valve body/clutch/servos maps of which fluid flow feeds what control circuits.

 

[Ele115]

My understanding is that it balances the available pump line pressure against the drive shaft speed tail shaft governor pressure. And will influence the car speed shift points.
Both up and down.

In Ford and GM, they had a a vacuum modulator. The (lack of)vacuum (at WOT)kept the valves closed, governor wanted to open them (road speed). Chrysler doesn't use vacuum. Just make sure the TV rod is all the way back when the throttle is WOT. Maybe a hair of clearance but if the throttle is all the way open, you shouldn't be able to move the TV arm anymore than it already is except maybe a tiny barely perceivable tiny bit. A minimal tiny bit of clearance is ok, but it should be so little you cant measure it.