I'm sorting out the remaining issues on my HPCR/48RE conversion of my '68 F250. I've been working on what I thought was a tranny overheat problem after the truck had run a while, but what I've figured out (with the help of my point and shoot LED temp sensor) that the tranny is not overheating. The 4" exhast runs right along side the transmission and very close to transmission temp sensor. I am assuming that as the exhaust pipe heats up under load it is 'cooking' the temp sensor.

Is there another spot on the transmission I can locate the sensor? Is there a simple way to shield the sensor from the exhaust pipe?

Thanks

Peter

 

MASS diesel sells a replacement tranny line (goes between trans and cooler on the side of the block) that has a port for the trans temp sensor. It's what I used and provides the hottest point to monitor temps at...

Where are you checking temps with your LED temp sensor and what is it hitting?

 

You can put it in the hot line anywhere you want, the closer to the tranny will give you the most accurate "hot" temp though.

 

Thanks for the MASS diesel idea.

I'm checking at the bottom of the transmission pan and at the inlet and the outlet of the transmission cooler. I'm hitting 150 on the pan and the inlet to the cooler and 120 on the outlet while the gauge is showing 250.

Peter

 

The pan is not a good place to check trans temps in my opinion. Check the output line, it is the hottest and most accurate. Even if the pan fluid is cool, the output line temps could be hot enough that the fluid inside cannot lubricate the internals and will break down and not do its job. Then, it gets cooled down and sent to the pan where it can be overheated again, causing trans failure. Check the output line temp after you have backed up a hill at lower speeds.