I am in the TC out line camp....I want to know how hot I am getting the fluid in the torque convertor...
That way I can adjust my driving
immediately instead of cooking my fluid and TC internals before I notice what is happening...ATF, even synthetic, only has a certain amount of time at extreme temps before it starts to degrade...
I also like the idea of running two guages like
@Cubey because I want to monitor the effectiveness of my ATF cooling system...(I hope you are using full synthetic with those temps...)
That way I can add more cooling capacity if I find my driving makes it necessary...
I want to apologize to the guys that want to run the sender screwed into the case...I have to disagree...all I see there is a convienient way to attach the sender and the reading is of limited use...yes, you get a general reading...
But...if you study the hydraulic circuitry you will find that the fluid has plenty of time and heat sink to cool before you get a reading from a case tap...
Mainline pressure has to come from the pump (which picks up from the sump) and flow along the case before it gets to the tap...aluminum, being highly porous, serves as a heat sink and can do a lot of cooling before you get a reading..
...and the pan fluid has the pan surface area to cool, as well... plus...the volume of fluid in the pan will pull the temp down because of that surface area...
A 'modified ' instead of a 'more true' reading from a case tap will give the driver a false sense of security and allow him to work the trans harder than the condition of the fluid will dictate...that is...if you want it to last as long as possible...
That is just my theory...I welcome differing opinions on it...hell...I always like to consult the brain trust we have here...so...if you can refute this...have at it...I am open to learning something new every day...
With the time and trouble and expense of a transmission rebuild and install these days...I want to hedge my bet on keeping it alive as long as possible...
Just my $0.02
This subject has the potential to spark a pretty lively discussion...not quite the same as cupholders...but lively nevertheless...