transmission temp. while towing
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Mountain Pass
Joined: Nov 2002
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transmission temp. while towing
I tried this post over in the expedition forum, but no one responded. Thought someone here may have some input.
I finally towed our travel trailer (~4000 lbs) for the first time since I installed my transmission temp. gauge. I'm curious if anyone has transmission temp. readings for comparison purposes. Towing on a twisty, hilly (going over the Cumberland plateau in east TN) two lane road, it hit 193 F (speed ranged from 30 to 50 with no OD or cruise control). Once I got into town (towing on level road at 30 to 35 mph) it cooled down to 178 F. I also towed on the interstate for about an hour and it hit 198 F. This was mostly long, steep climbs were I start at the bottom at about 65 mph and by the top I'm down to 50 mph (again, no OD or cruise control). BTW, I have Mobil 1 syn. in the transmission and the sending unit is in the inspection port on the E4OD/4R100.
Just curious if anyone else has temp. readings and what temperatures are safe. I also had two bikes on a bike rack hanging off the front of the expy (frount mounted receiver). I'll post pictures once I get them developed (we are one of the last families in America to not own a digital camera).
Philip
I finally towed our travel trailer (~4000 lbs) for the first time since I installed my transmission temp. gauge. I'm curious if anyone has transmission temp. readings for comparison purposes. Towing on a twisty, hilly (going over the Cumberland plateau in east TN) two lane road, it hit 193 F (speed ranged from 30 to 50 with no OD or cruise control). Once I got into town (towing on level road at 30 to 35 mph) it cooled down to 178 F. I also towed on the interstate for about an hour and it hit 198 F. This was mostly long, steep climbs were I start at the bottom at about 65 mph and by the top I'm down to 50 mph (again, no OD or cruise control). BTW, I have Mobil 1 syn. in the transmission and the sending unit is in the inspection port on the E4OD/4R100.
Just curious if anyone else has temp. readings and what temperatures are safe. I also had two bikes on a bike rack hanging off the front of the expy (frount mounted receiver). I'll post pictures once I get them developed (we are one of the last families in America to not own a digital camera).
Philip
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Joined: Nov 2001
Posts: 4,742
Likes: 8
From: OK
Since you have some bikes up front interrupting air-flow, you might want to consider replacing the factory cooler with a larger one from the aftermarket. If you do this, be sure to get one with a bypass valve so the transmission will get up to operating temps in cold weather.
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