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PostPosted: Thu Jun 01, 2017 8:14 pm 
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Turbo EFI
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Joined: Fri Dec 30, 2005 2:49 pm
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Location: Houston, TX
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This is probably a question I should have asked years ago. We run a pretty big trans cooler on the LeMons Dart, which has a mostly stock 904 with a deep pan. I only say "mostly" because the valve body may have been mildly breathed-upon for firmer shifts when I had it rebuilt back in college... but I honestly don't remember. It's all stock clutch packs, no V8 guts or anything. We leave it in Drive for races.

I don't think I've ever seen the trans temp get above 150 °F during a race. More often it's closer to 140. Is that too cool?

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PostPosted: Fri Jun 02, 2017 4:18 am 
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Yes, it can be too cool. You can look up the optimal operating temp for an old school automatic, but IIRC it is 180-200 F. However, if it has lasted this many races, I might just leave everything alone!

Lou

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PostPosted: Fri Jun 02, 2017 7:12 am 
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EFI Slant 6

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I would be suspicious of your temp measuring system, that temp doesn't add up, Are you in Alaska? :D


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PostPosted: Fri Jun 02, 2017 9:00 am 
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Yeah, I agree it does sound very low for something getting that kind of workout, even with a big cooler. Might be the sensor is bad. Are you reading temp on the fluid output of the trans or closer to the input?? You want the output...

Lou

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PostPosted: Fri Jun 02, 2017 9:20 am 
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Joined: Thu Oct 17, 2002 7:27 pm
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Location: Park Forest, Illinoisy
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180-200 is optimal. 160 is not unusual.

I can read trans temp on my Challenger, it rarely gets above 180, and it takes quite a lot of driving to get it there. :D

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PostPosted: Fri Jun 02, 2017 12:04 pm 
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Turbo EFI
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Sounds like a WHACK gauge!
What does the "Water" temp run at usually?

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PostPosted: Fri Jun 02, 2017 1:48 pm 
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Also, what kind of trans fluid are you running? Some people are under the mistaken belief that Type-F fluid is "superior" -- it is not; it's an archaic fluid that is severely inferior in absolutely every performance and durability characteristic. Today's Dexron-VI handles higher temperatures than yesterday's fluids (viscosity doesn't change, varnish and sludge don't form).

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PostPosted: Fri Jun 02, 2017 5:43 pm 
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Turbo EFI
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Dart270 wrote:
Yeah, I agree it does sound very low for something getting that kind of workout, even with a big cooler. Might be the sensor is bad. Are you reading temp on the fluid output of the trans or closer to the input?? You want the output...

Lou

:oops:

Yeah, the temp sensor is mounted in the pan. I suppose that's not a very useful measurement, then.

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PostPosted: Fri Jun 02, 2017 6:53 pm 
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EFI Slant 6

Joined: Thu Jun 04, 2015 6:19 pm
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Location: Florida
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No, that should work, is it electrical or mechanical?

Do you have access to a thermal temp gun, just read the pan when hot, it should be close/slightly lower then your gauge reading,just to verify whats going on.


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PostPosted: Sat Jun 24, 2017 8:46 pm 
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EFI Slant 6

Joined: Sat Mar 19, 2016 7:25 pm
Posts: 359
Location: SW PA
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I just checked out a '10 F-150 Lariat w/the trans temp gauge function, I hit
trucks and cars w/a pretty harsh road test, if it's gonna slip or shudder hot
I want it to be on Me....not a customer after purchase...happened once on
a Chebby to Us already( converter clutch bits plug-up the cooler).
On the test (approx. 9 miles) the temp was hovering right around 150deg.
when I pulled it into My bay. I wouldn't lose one millisecond of sleep over it.


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