Engine/Transmission (1998.5 - 2002) Auto transmission ??

[barryg41]

I kind of know the In's and Out's of driving In and Out of overdrive. I know the shift points change when you are out of overdrive compared to the overdrive shift points.



What I would like to know does the transmission pressure change the same as the shift points? I know speed and rpm controls the line pressure, just not sure if running out of overdrive also changes the way the TCM controls the line pressure.



I think it would be more convincing to drive in town out of O/D, if the line pressure was relative to shift points and rpm.



Yall have a great turkey day!

 

[barryg41]

TTT

TTT... . I was hoping someone could answer this...

 

[GLASMITHS]

I'm not a transmission specialist, however to my knowledge the line pressure is controlled by throttle position, not rpm or the PCM. That is the reason for the BD pressure lock, for instance. Also most , to my knowledge, the aftermarket v/b increases the pressure when under light throttle. But never rpm or PCM.



It is always better to keep it out of o/d below 50mph.

 

[barryg41]

So... laying in on the throttle is the way to go if I want to keep higher line pressure. You know, after I read your post... I remember LSMITH telling me to keep the RPM's up and don't let off the throttle till you get to a desired speed.



I do keep it out of O/D and just about always keep it at 2k RPM's till I get to the desired speed. Yes, he also advised me to get the aftermarket V/B also. I didnt listen to that part, but I am working on that.





Auto Guys..... Floor the crap out of it to save your transmission... :--)

 

[inarush76]

pressure

Glasmith isn't too far off. Base line is set with the pressure regulator spring, and LINE RISE is controlled by throttle position. As you open the throttle, pressure increases in relation to throttle angle. HTH



James