Transmission temp sensor

[worzy]

I am installing my new guages and I am not sure where to put the transmission temp sensor on a 4R100. Is there a hole for an extra guage or do I have to drill into the pan?

[mschn99]

there is a service port i bleive on the right hand side just a little in front of center....there will be a small plug there for manually checking line pressure......most senders are designed to screw right in there......that is a more accurate reading also than the pan....as different parts of the pan can very a little on temp.....Marc

[worzy]

Thanks for the info Marc. I installed the guage and took the truck for a ride, the guage never moved. What is a normal operating temp for the tranny when not pulling. I'm not sure if something is wrong or if the tranny isn't getting hot enough to show on the guage.

[mschn99]

your tranny should be at over 100 degrees within a few miles of driving....and should reach 150 or so within 5-10 miles on a warm day.....and within the first 15-20 miles on a cooler day......sounds to me like there may be a guage or sender problem..........when you pulled that plug...did trans fluid come out...you should have had a little come out since it is a port right into the trans fluid....just a though....other than that...either somethin isnt hooked up right or you have a bad gauge or sender.......Marc

[worzy]

Marc,
I think the problem is in the grounding of the sensor to the tranny. The sensor completes it's circuit by getting a ground through the threads in the transmission. I pulled the sensor out (there is fluid coming out) I heated it up with a lighter and touched it to the pan and it did work but, sometimes I had to move it around to get a good ground. I cleaned the threads and reinstalled, haven't tested yet but it should work now. Thanks for the info.
Nate

[mschn99]

let us know if that fixed it nate....there is a sealer on that plug i beleave and if there was some left in the threads in the trans case that would explain it.......Marc

[Lifted00]

It does take a while for the guage to read. I put mine in the side of the trans also, and it takes a good 10-15 miles of driving on the HWY for the guage to read just above 100 deg. After about 20-25 min. it gets to just under 150 deg. and that's where it stays if I'm not towing. Just means that your trans. is working well and not building alot of heat. There really isn't alot of friction in the trans. when you are driving down the road. The torque converter is locked, so it's not slipping causing heat, the clutches and bands should be holding not causing heat. Other than the bearings and pump. Not much heat is being built when cruising not towing. When you are towing, the torque converter stays unlocked much longer, the epc commands higher pressures, so heat builds faster.

[Deeno]

Originally Posted by Lifted00

It does take a while for the guage to read. I put mine in the side of the trans also, and it takes a good 10-15 miles of driving on the HWY for the guage to read just above 100 deg. After about 20-25 min. it gets to just under 150 deg. and that's where it stays if I'm not towing. Just means that your trans. is working well and not building alot of heat. There really isn't alot of friction in the trans. when you are driving down the road. The torque converter is locked, so it's not slipping causing heat, the clutches and bands should be holding not causing heat. Other than the bearings and pump. Not much heat is being built when cruising not towing. When you are towing, the torque converter stays unlocked much longer, the epc commands higher pressures, so heat builds faster.

I just got back from pulling an 8,750lbs travel trailer through the mountains in WV (Home) and the highest trans temp I seen using my Predator tuner was 142 degrees. I'm assuming that is pretty good I figured it would run much hotter than that

[jsargente]

Originally Posted by mschn99

there is a service port i bleive on the right hand side just a little in front of center....there will be a small plug there for manually checking line pressure......most senders are designed to screw right in there......that is a more accurate reading also than the pan....as different parts of the pan can very a little on temp.....Marc

I was unable to locate this port, any help would be appreciated. Thanks JS.

[mschn99]

i cant remember if the e4od has it on the right or the left, but you will see a small plug, which screws in horazontal to the ground. it will be just above the lip where the pan meets the case........also, look at this link, i beleave it has a picture.......Marc

http://www.powerstrokeforum.com/foru...ead.php?t=1588