My brother is driving my stock 93 4x4 auto and he called me today. He lives in the mountains of North Alabama and said the trans was pushing some serious temps unloaded up some of the steeper grades. I have the sensor in the hot line (mistake, IMO) going to the aux. trans cooler and he said it would peg the gauge routinely (250 degrees or so) up the nastier hills. Ambient temp is mid 90's. 35" tires. I know the hot line temps are way hotter than pan temps, but is that too high? What temp is my trans seeing (post-coolers) when the hot line is at 250 degrees? And if this is indeed too hot, then what's the deal? Where do I start looking?

Thanks.

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Mine sometimes gets 220-230 in the hotline also empty no hills but outside temps 100-105 hottt!!!!

 

pretty much the same here. I put a good size trans cooler on it and it keeps the temps reasonable when empty, but they still get up there to max on the gauge when pulling my jeep around and get into the hills.

I have my temp sender where the factory od switch would have been.

 

Well crap. That was my problem with putting the probe in the hot line. And whats the point of having a friggin gauge if you can peg it with no worries?

Also, you won't know what temps your trans is actually seeing after the coolers do their job. How are you supposed to know if your cooling system is sufficient for the load you are putting on your truck?

And, you guys that run a probe in the hot line, what do you consider the "danger zone" for this probe location? I am running the factory cooler plus the dealer installed auxiliary cooler under the bed.

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I saw 250 in the hotline the other day trying to move a 30' boat around in tight quaters. I kept getting stuck but I wasn't really being hard on it and the temp just kept climbing.

 

I saw 230 on the pan. And that was in my custom car. (Polaraco)Same conditions.

They cool down when they are all locked up though.

 

I don't see mine locking up anytime soon. At least not till I throw a 47RH in her. Haha.

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they run much cooler with a 47rh. I have not seen over 180 (pan) yet this summer pulling my camper.

 

Yep any decent hill with a load will see 250 in the hot line. Even with NO O/D. Thinking of moving the sender to the trans pan....

 

I've seen only about 200 max ever with mine in the hotline. That's unloaded just going up hills and what not. The outside temp will make a big difference, it made mine run much hotter the other day. I have a big B&M trans cooler with a fan mounted under the battery tray on an angle with a spot cut out in front of it to give it some air. Im thinkin about movin it to the bed or under the bed though cuz I think it could get a little better air. I have the fan on a switch and it definately helps cool it down.

One thing I want to do is get rid if the trans heater thing under the manifold. (Need room for twins anyways) That way you can actually cool the fluid better instead of havin your engine temp warm it back up again. I've always thought this was kind of a culprit and need to bypass it so it wont stay a sustained hot all the tine when the truck warms up.

 

actually 92smokin Blacky I have heard the heat exchanger is more efficient at removing heat as it absorbs it through liquid rather than air.

 

I've heard that people have problems with the trans running even hotter after they removed the heat exchanger as well.

 

So I gather that a hotline probe isn't really a good idea unless your gauge reads up to 300 or 350. Also it gives you no idea how your coolers are performing

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True! I think I will put mine in the pan one of these days.

 

If that's the case then I wonder if it'd be worth getting another bigger cooler and running water or antifreeze in it to run to that heat exchanger instead of the radiator. Then have colder fluid cooling the atf down rather than the engine temp?