Line pressure, vs. friction area, vs TC

[Killerbee]

which one, when modified, adds most to shift harshness?

Looking to understand what approach to take to keep part throttle shifting near stock level smoothness.

 

[Mike L.]

Line pressure although the other two contribute also.

 

[Killerbee]

Maybe that is good news. Not very familiar with valve body mods, but have you experimented with a way to modulate shift line pressure, without circuitry? Something that eases part throttle shifts, if that makes sense.

i need to read up on how these work, and the hardware involved.

 

[Mike L.]

Play with your fuel tables as that is where you will make the most changes to shifting. very little can be done in the valve body or TCM.

 

[Killerbee]

yup,

I was just thinking ahead, don't really have a problem (yet) but the torque management will probably take care of it.

 

[IOWA LLY]

Maybe that is good news. Not very familiar with valve body mods, but have you experimented with a way to modulate shift line pressure, without circuitry? Something that eases part throttle shifts, if that makes sense.

i need to read up on how these work, and the hardware involved.

Ya, they are called "trim valves"

 

[Killerbee]

trim valves?

any more discussion on this? What do they do? and are they moving parts that add another reliability factor to the tranny?

 

[Mike L.]

Ya, they are called "trim valves"

Trim valves don't modulate; trim solenoids do. If you feel real lucky you can play with the gain valves.

 

[WolfLMM]

trim valves?

any more discussion on this? What do they do? and are they moving parts that add another reliability factor to the tranny?

No, not really.

 

[WolfLMM]

The way trans-go modifies the valves, there shouldn't be any increase in shift harshness, in part throttle conditions. When you shim the pump, that opens another can of worms.

 

[Mike L.]

The way trans-go modifies the valves, there shouldn't be any increase in shift harshness, in part throttle conditions. When you shim the pump, that opens another can of worms.

That does not add anything to the shift firmness. Only tie ups do that.

 

[WolfLMM]

Thats what I meant there Mike:baby::angel: