safe temps? - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 21 (permalink) Old 04-29-2007, 08:01 PM Thread Starter
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safe temps?

my concern is my tranny. just wanting to know when tranny is getting hot! the highest I've had it was today at almost 200 degrees pulling a trailer. I think thats ok but want to know for sure.

97 F-250 7.3 psd 4x4: homemade Intake, fpr mod, IDM mod, 18k mod, HX mod, a pillar w/ 3 autometer gauges, 3" downpipe, minus muffler and cat.
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post #2 of 21 (permalink) Old 04-29-2007, 08:10 PM
 
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totally fine.
248 is Ford's red line.

I would use around 235 and if it's still climbing, pull over and let it cool before you proceed.

If it just creeps up to 220-235 while pulling a hill, and cools back down when you get to the top, nothing to worry about.

Where damage can be done is lingering at the 225-235+ range for long periods of time.
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post #3 of 21 (permalink) Old 04-29-2007, 08:12 PM Thread Starter
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thanks so much

97 F-250 7.3 psd 4x4: homemade Intake, fpr mod, IDM mod, 18k mod, HX mod, a pillar w/ 3 autometer gauges, 3" downpipe, minus muffler and cat.
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post #4 of 21 (permalink) Old 04-29-2007, 08:21 PM
 
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You're welcome
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post #5 of 21 (permalink) Old 04-30-2007, 01:48 AM
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Loco is that at the test port like most of us are reading or the fluid in the trans. pan?

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post #6 of 21 (permalink) Old 04-30-2007, 05:34 AM
 
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I do believe it's at the test port. The port is a little warmer than directly in the pan, but not by much.

I've watched the temps the PCM sees with diag software and my gauge and it's normally within 5 or closer to each other.
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post #7 of 21 (permalink) Old 04-30-2007, 06:54 PM
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Ditto what Gregy said... AE shows about 5-8 higher.

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post #8 of 21 (permalink) Old 05-01-2007, 05:44 AM
 
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The hotter the ATF gets the shorter it's life will be. 248 is too hot, I don't care what Ford says. I get several E4ODs and 4R100s a month at work that failed from overheat. I don't like to see anymore than 185*F for extended periods of time. 200-215*F for short periods. If I ran 190*F+ for any length of time I'd look into bigger coolers. I don't see more than 180*F at 22-26,500 GCVW all over the west coast in ambient temps up to 108*F.

Bottom line is the temps you are seeing are OK, but cooler is better. The other thing to watch out for in ATF is it's usable life. Although ATF may look clean for a very long time that doesn't mean it's still serviceable. The different types of ATF have different levels of anti-wear/extreme pressure and friction modification. The longer the ATF is in the transmission the more of those additives are used up. Heat will also cause oxidation and reduce the amount of additives in the ATF. So the more heat you see the shorter the change interval should be.
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post #9 of 21 (permalink) Old 05-01-2007, 06:21 AM
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OK it was 85* here sunday. I drove 45 miles NOT towing anything. My temps were at about 160-165. I have the ATS converter and ATS deep pan. shouldnt that cool my tranny?

I was thinking maybe i should not run on my 60T setting empty. Since the line pressure is already boosted and then the chip adding pressure probaly makes it run hotter. Does that sound right?

04 Ford F250 4x4 Crew Cab Long Box ZF6 Manual.
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post #10 of 21 (permalink) Old 05-01-2007, 07:01 AM
 
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Adding more line pressure will not cause more heat. 165 seems a bit hot unloaded. In similar ambient temps I see around 115-135*F unloaded depending on where I'm driving and how fast. You could have a partially stuck CBV, Cooler Bypass Valve. This is the banjo fittings and black tube that runs between the in and out cooler lines on the transmission case. Either throw it away or buy a new one. You can test the CBV by pulling a cooler line and checking flow at idle.

You might also look into investing in a V10 or 6.0 ATF cooler, both are considerably larger than the stock 7.3 cooler. The V10 is a direct bolt in, the 6.0 will need adapters to go from 1/2" to 3/8" lines, no big deal.

Oops, I see you have an E4OD and OBS. Well, you can still use the V10 or 6.0, but in your case a good aftermarket ATF cooler will work just as well. Look at www.bulkpart.com for decent prices on coolers, or trans parts USA, or just go to sumit or jegs. You also don't have the CBV, but you might have a partially block cooler so checking flow would still be a good idea.

I wouldn't worry, your temps are within the safe limits but as I said cooler is better. Might want to just look into a larger air to oil cooler, simple enough to install and cheap insurance.
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