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Hi guys and girls
I'm a long time reader, not much of a poster and would like to take this opportunity to thank everyone for the knowledge and time they so freely share.
Question is, will connecting a pressure gauge to the trans cooler line give me the same reading as using the port on the side of the case, reason is its hard to get to the case port and I want to be able to do regular pressure checks, I am also already using case port for a temp gauge.
Thanks again
Here is what I tell my customers...
Case port for temp doesn't really give an accurate temp, because it dead ends. There is no flow past the sender unit. I heard of guys using the cooler lines for trans temp. Here is what I know about that in both temp and pressure.
A) Cooler in will show the hottest temp out of the converter.
B) Cooler return will show the coolest it will get.
C) Sender in the pan (where the manufacturer places it) will give you an average temp from cooler return, because return oil becomes lube oil for the bushing and bearings. Then it gets dumped into the pan to be sucked up by the filter to go to the converter and start the cycle all over again.
As far as the cooler lines and pressure goes.
Cooler lines are not line pressure when studying a Line pressure diagram. Converter pressures start out as line pressure inside of the transmission but are regulated by the AFL (actuator feed limit) valve. Internal converter pressure may exceed 110psi, hopefully not. That is when the TCC apply piston bends or deflects & engine thrust bear failure occurs. Line pressure in reverse at idle can exceed175psi and 250+ psi at full line. It should run between 75psi @ idle and go up to 225+ psi in drive at full line.
Here is a picture of the line pressure test from a HP 2004R I'm working on now.
My suggestion is to use the pressure port as it is intended and place the sending unit in the pan
Thanks, I will plumb temp sensor onto pan when I fit a drain plug in and make a hard line extension for case port down the side of case where I can get to easily, but is still out of the way in a safe place. Trans is coming out to be rebuild as slips on 2-3 up shift under higher rpm, wanted to line pressure test to compare before and after rebuild. I have just done my 1st pretty much stock 4l60e rebuild on a second hand trans after watching transmission bench tutorials and reading threads on here for the last year.
This rebuild I will be using all the good knowledge I have picked up here, my only problem now is the cost of parts in New Zealand with an exchange rate of NZ $1 = US $0.60 plus postage and tax.
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4l60e pressure gauge 
