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Discussion Starter #1
hello all, got 107,000km's on my 2 f350 crew, gonna tow a enclosed car trailer this weekend, and have never towed nything that heavy, anything i should be looking for? can you tow in overdrive? installed a set og guages a while back, just serviced my trans , filter and flushed with 20 litres of new oil. around town in 25c weather it runs 120 degrees f is this normal?
thanks in advance
 

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Senior Member
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Yes, you can tow in overdrive. Just don't let the tranny "hunt" for gears when towing uphill.

Your temps seem fine. Anything from 70* to 90* over ambient is fine from what I have been told.
 

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I just towed a 7000# travel trailer 5 hours through 100* heat this past weekend.

I was seeing tranny temps of 180-190* cruising between 65 and 70 mph. Without the trailer I was in the 150-160* range.
 

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Discussion Starter #5
some mouintainous terrain in northern b.c. but going to flatland alberta , hauling a new 26 foot enclosed car trailer and a 3200 car in it on the way back, on the way back it is all down hill though...

should i tow it stock, or with my dp tow tunes?
 

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were did you mount your tranny temp probe? If you put it in the pressure port in the case that will only give you case temp. If you look at a 4R100/E4OD that is gutted the case is about a 1.5" to 2" thick the fluid doesn't really pass over the probe.

In my '00 F550 I have a probe in the pressure port (PPT) and a probe in the cooler line coming out of the front of the tranny (Torque converter drain) I like to call this Torque converter Temp (TCT).

I have seen my TCT @ 250* while the PPT is @ 185* while driving in the city, all torque converter no TC lock up.

I have seen my TCT @ 160* while the PPT is @ 175* while driving on the highway, the TC locked. on the same 90* day hauling a load of hay, GCVW about 35,000#'s

I feel the most important place to monitor the tranny temp is at the torque converter drain that is were you will get the most heat. For example when I come off the highway (with or without a load) the TCC unlocks and I can watch the temp go from 140* to 220* by the time I get to the toll booth, then I drive off and and the temp rises a little bit and as soon as the TC lockup (2nd gear 30-35mph) the temp falls fast from 240* to 180* and then a few miles down the road (if the TCC stays locked) it falls to 140*. The PPT stayed the same the whole time.

Another example last week, the air temp was high 90's, I was hauling 10 horses in my 8x32' stock trailer. The last 15 miles of the trip were on windy, hilly dirt roads, I had to drive slow 20-30 mph after a few miles the TCT was 220-230* and the PPT was 160*ish by the time I got to the farm the TCT was 250* and the PPT was 190*. That's O.K. if you leave the truck running as I did.

As a rule of thumb I do not shut off my SLUSH-O-MATIC trucks until the TCT is less than 180*

TCC Torque Converter Clutch
TCT Torque Converter Temp
PPT Pressure Port Temp
 

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some mouintainous terrain in northern b.c. but going to flatland alberta , hauling a new 26 foot enclosed car trailer and a 3200 car in it on the way back, on the way back it is all down hill though...

should i tow it stock, or with my dp tow tunes?
If you have a tow tune from Jody, then you can tow with it without fear.
 

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In the passing lane
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I towed our toyhauler this weekend in 100* weather with no problems I have a 6.0 cooler though but our trailer is about 14k loaded. Its fine to pull in overdrive as long as your not hunting for gears on the hills.
 

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Discussion Starter #9
were did you mount your tranny temp probe? If you put it in the pressure port in the case that will only give you case temp. If you look at a 4R100/E4OD that is gutted the case is about a 1.5" to 2" thick the fluid doesn't really pass over the probe.

In my '00 F550 I have a probe in the pressure port (PPT) and a probe in the cooler line coming out of the front of the tranny (Torque converter drain) I like to call this Torque converter Temp (TCT).

I have seen my TCT @ 250* while the PPT is @ 185* while driving in the city, all torque converter no TC lock up.

I have seen my TCT @ 160* while the PPT is @ 175* while driving on the highway, the TC locked. on the same 90* day hauling a load of hay, GCVW about 35,000#'s

I feel the most important place to monitor the tranny temp is at the torque converter drain that is were you will get the most heat. For example when I come off the highway (with or without a load) the TCC unlocks and I can watch the temp go from 140* to 220* by the time I get to the toll booth, then I drive off and and the temp rises a little bit and as soon as the TC lockup (2nd gear 30-35mph) the temp falls fast from 240* to 180* and then a few miles down the road (if the TCC stays locked) it falls to 140*. The PPT stayed the same the whole time.

Another example last week, the air temp was high 90's, I was hauling 10 horses in my 8x32' stock trailer. The last 15 miles of the trip were on windy, hilly dirt roads, I had to drive slow 20-30 mph after a few miles the TCT was 220-230* and the PPT was 160*ish by the time I got to the farm the TCT was 250* and the PPT was 190*. That's O.K. if you leave the truck running as I did.

As a rule of thumb I do not shut off my SLUSH-O-MATIC trucks until the TCT is less than 180*

TCC Torque Converter Clutch
TCT Torque Converter Temp
PPT Pressure Port Temp

i installed my probe in the hole on the drivers side front of the trans , just pulled a plug out and stuck it in there, so which one is that? does that mean the fluid is hotter or lower than indicated by the guage?
 

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i installed my probe in the hole on the drivers side front of the trans , just pulled a plug out and stuck it in there, so which one is that? does that mean the fluid is hotter or lower than indicated by the guage?
That is what hayjayhorses is referring to as Pressure Port Temp. I have done a limited amount of tracking of temps to and from the cooler (it sounds like he is referring to Torque Converter Temp as the line from the trans to the cooler). I saw reasonably good correlation between the pressure port and the line out to the cooler, but I didn't run it for a wide variety of conditions (this was just a temporary setup). I have regularly tracked temps in the pressure port and the pan, and found that the pressure port will "lead" the pan temp when the temps are increasing due to load, but the pan will run hotter sitting in traffic with little airflow over the trans cooler.

I have read some posts on a forum from a former Ford transmission design engineer, and he recommended watching the cooler return line (from cooler to trans) as the most critical.

Regards,
Michael Pliska
 
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