Transmission temps
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4wd High
Joined: Jun 2009
Posts: 9
Likes: 0
Transmission temps
I have a transmission temp gauge on the line going from the torque converter to the cooler. The temp usually runs between 165 and 180 when I am pulling my boat, (8,000 lbs), with an outside temp around 85. This past weekend it stayed around 195-205 the entire time I was puling the same boat. The temp outside was around 90. It has never stayed that high even in past summers with higher outside temps. I am always very careful to get the transmisson into torque lock up as quickly as possible to avoid excessive heat. Fluid level and smell is good. Is there possibly something going wrong in the transmission that would cause an increase in operating temps? It still shifts normal, no slipping or other obvious issues.
Thanks
Thanks
FTE Legend
Joined: Jul 2005
Posts: 65,938
Likes: 1,432
From: Millersville, MD
Oops...sorry, I thought I saw you had an 05 V10...my mistake.... Just make sure you have a BIG tranny cooler in there. Do you have the trailer tow package or the camper package? Obviously, cooler is better.... occasionally hitting 200 prob won't hurt anything. Change fluid (twice as) often and don't allow it to STAY at 200 or above. Drop it down a gear if you have to...kick overdrive off.....
Sit. Stay.
Joined: Oct 2001
Posts: 18,308
Likes: 20
From: Washington State
If it is in OD and can hold it, that it the best position for it. The TC is locked and the tranny runs cooler when locked.
Seems the OP has an 01 F250 with the 4R100. Sounds like he needs a cooler upgrade for starters. But that wouldn't explain why the sudden increase in operating temps, ambient temps non-withstanding.
Seems the OP has an 01 F250 with the 4R100. Sounds like he needs a cooler upgrade for starters. But that wouldn't explain why the sudden increase in operating temps, ambient temps non-withstanding.
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4wd High
Joined: Jun 2009
Posts: 9
Likes: 0
I forgot to say it is a 2001 F-250 V10. The only upgrades I have made to the transmission was changing to synthetic fluid at 30,000 miles and a high capacity aluminum pan. It ran at normal temps the weekend before last on a 400 mile trip to the Lake of the Ozarks with the boat. It just started this problem this past weekend on a shorter trip. I did flush the radiator fluid a month ago, but like I said it was fine on the previous trip, so I do not think that is the problem.
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,695
Likes: 2,616
From: SE Florida
Bull. The trans can run A LONG time at 200F. And since he has the sender in the line to the cooler 200F is well within normal.
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Postmaster
Joined: Jul 2008
Posts: 2,565
Likes: 2
Since it was a sudden change, make sure that the cooler fins aren't plugged up with bugs. If so, flush them out with a garden hose.
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Former ******
Joined: Nov 2004
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From: Salt Lake City, Utah
I would second all the above, but would also recommend that you replace the fluid. Transmission fluid has thermal carriers to dissipate heat, my guess is the fluid is starting to break down and may not be carrying the heat properly.
I would also agree that 200 degrees running to the cooler is in fact normal. Just so long as the fluid is not getting over 240 on that same line you should be fine.
I would also agree that 200 degrees running to the cooler is in fact normal. Just so long as the fluid is not getting over 240 on that same line you should be fine.
Hotshot
Joined: Feb 2003
Posts: 11,537
Likes: 27
From: Long Beach, Ms.
The time I had a problem with a high trans temp it was due to a problem with the filter. I never did find out just what did go bad. The problem did go away when I changed out the filter when I changed the overheated fluid.
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