Transmission Temperature - Ford Powerstroke Diesel Forum
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post #1 of 37 Old 06-01-2013, 12:05 PM Thread Starter
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Transmission Temperature

I did some reading using the search function but couldn't find exactly what I was looking for.
I noticed today while driving my transmission temperature got to 185 degrees. It was about 85 outside.

My question is...is 100 degrees over ambient acceptable? I was not driving hard and had no weight in the truck. Seemed like it might be a little high considering nothing was being towed.
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post #2 of 37 Old 06-01-2013, 12:07 PM
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time to look into a 6.0 trans cooler.


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post #3 of 37 Old 06-01-2013, 12:19 PM Thread Starter
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So 100 degrees over ambient is too high? At what temperature could failure occur?

What should it be in an ideal scenario?
I'll look into the 6.0 cooler.
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post #4 of 37 Old 06-01-2013, 01:05 PM
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Your not crazy high, below 200 is fine, above that and the fluid starts to break down fast and the trans can be damaged. Im live in FL, unloaded even in the hot summer months with the 31 row 6.0 trans cooler I rarely see over 150.


2000 DRW CC 7.3
Exterior: 08 Exterior Clone, 22.5's
Engine Mods: GTP38R WW2, 5 inch exhaust,T500, 6637, TW tunes,DI Up pipes, 6.7 fuel pump fuel system.
Trans Mods: 6.0 trans cooler, JW Valve body,Billet triple disc converter.
Sound Mods: 7" flip out tv, 3-way speakers all around, 12" sub, 500 watt amp.
Misc:dieselsite coolant filter, max ac assist, BRV, IHD,gauges, CCV

Next up power rear window
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post #5 of 37 Old 06-01-2013, 02:15 PM
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100* over ambient is okay/normal, but most people see that when they are towing something. You do not really want to go over 220* at all.

I would invest in a bigger cooler as well.

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post #6 of 37 Old 06-01-2013, 02:47 PM
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I never run that high.
Were you on hwy or city? TC locked or unlocked?



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post #7 of 37 Old 06-01-2013, 05:24 PM
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i would do a 6.0 cooler and change out the bypass tube

2000 F250 XcabSB, 4x4, 4" strait pipe, DIY intake, FRx, BDP tunes, WW2, 6.0 cooler, BTS VB, gauges, 55w digital projector HIDs
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post #8 of 37 Old 06-01-2013, 05:42 PM
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I have a 6.7 and its norm is 196* hwy 203* Not loaded

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post #9 of 37 Old 06-02-2013, 05:01 AM
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Quote:
Originally Posted by 2013F250Tank View Post
I have a 6.7 and its norm is 196* hwy 203* Not loaded
A 6R140 is a totally different animal than a 4R100. IIRC the 140 has what effectively works as a thermostat, just like the 5R110 in the 6.0 and 6.4s.

The more basic 4R100 doesn't.

To the OP, on a stock cooler which is about the same size as your keyboard a 100 over ambient temp is pretty normal. A bigger cooler will defiantly help the cause. A 6.0 cooler is a great upgrade, don't get hung up on 31 vs 26 row both work very well and are a huge upgrade over the 9 row 7.3 cooler. Search around online and you can find new ones in the 270-350 range. Mine came out of a junk yard for $100.

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post #10 of 37 Old 06-02-2013, 05:48 AM Thread Starter
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Thanks for all the input, I have been researching them. I've read that when getting a used one you want to make sure to flush it really good. Seems like I've also gathered there are some aftermarket ones available from places like Summit, but haven't determined what the general consensus is on those.

To jesilvas, I was on divided highway that has some small hills and scattered red lights, not stop and go but not full on moving.
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