Not sure there's a normal per se....more like an average. I'm usually around 214-217 (JKU with 35's, lift, steel front bumper w/ winch and gobi rack). I don't have any issues with overheating. Just waiting to re-gear which will help some.

 

Sorry, I thought you were talking about engine temps. My coolant temp varies between 185-200 depending on what I'm doing with the Jeep.

 

So if I'm running just a lift and 35s with no armor is 206 high for a transmission temperature? I asked my buddy that's a mechanic says 200 isn't good for any car. But he doesn't know much about jeep. I guess I'm asking is being in the 200s high for just 35s and a lift?

 

Optimal transmission temps are usually under 200F. 160-180F is perfect. If you're 200 or over get a cooler and/or a bigger pan with cooling fins on it.

 

Any idea where I can get one? Link?

 

I'm running a Flex-a-Lite transmission cooler with my 3.8 and 42RLE. It definitely keeps the transmission cooler than stock. It's also very affordable.

 

If you are checking temp while in park or neutral you will not see trans temp- it displays engine temp. Known fault on JKs. No fix either. haha

 

Lol. I actually just found that out a few minutes ago. Buddy asked me "are you seeing 200F while driving or when you're parked..." I said in parking.. When I'm driving I see 160-170 maybe if it's really hot outside 180. He then explained that only worry when you see 200 when you're driving.

 

I always been interested in this topic. Most transmission cooling lines are run through the radiator so eventually the temperature should be close to the coolant temperature. This indicates the builders think temperatures 200-220 are fine.

What good would an aftermarket cooler do if the fluid is still being circulated through the radiator? Because if the cooler lowers it the coolant will raise it again

 

They do that because they want the trans to warm as as fast as possible for better fuel economy and emissions. They honestly have no vested interest if the transmission lives longer than 100k miles. The temperatures mentioned before as factual to the fluid it's self. Below 200 the fluid will live longer. However if changing fluid every 50-60k it's more than likely not a big deal.

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The part of the radiator transmission lines are run through is an OtW (Oil-to-Water) cooler, and in no case is the returning oil warmer than the inlet oil. Adding an OtA (Oil-to-Air) cooler will further cool the transmission oil, if necessary. Most, probably all, modern transmissions have a thermostat that bypasses any coolers until the transmission has warmed to a specified temperature.

Interestingly, Ford left out the OtW cooler for the 4R100 tranny behind the initial PowerStroke diesels. Around 2000 they figured out the error of their ways and put the OtW cooler back in. Mine, with no thermostat (remember I said "modern" transmissions ) will rarely ever get to 180*, even when grossing 15K through the Rockies, and Ford specs them to run at 175* all the time. I'm not too worried about it at my altitude, but condensation can be a problem if the transmission never gets warm enough to evaporate it. That's one of the reasons newer trannies have thermostats.

Mark

 

Right around 200 is where you want to be. Once you get above 225-250 the transmission fluid starts breaking down faster. It would be OK to let it get that hot for limited use. But the more time you spend over about 220 the sooner you need to change the fluid. If I ever got close to 275 I'd probably shut it down and let things cool off.

 

So realizing old post here, but here's the reason why you're seeing 206 range, the wrangler has a cooler built into the coolant radiator so since you're operating in town driving stop & go or long idling the radiator will heat up the transmission until you start driving & enough air flow passes & pump in automatic transmission pushes volume through lines to cool transmission back down. You can check this by idling & seeing the coolant temperature & radiator temperature being almost or exactly the same temperature. As for a fix believe several aftermarket kits that can bypass the coolant radiator & adding a separate radiator just for transmission & some with electric fans & thermal switch that turns fan on automatically to keep transmission cooler.

 

Did you read the thread? The OP was reading is transmission temp in park, where jeep displays the engine coolant temp, not the transmission temp.

Also, the WA580 in the 12+ models do not have an OtW cooler in the radiator. They only have the OtA cooler visible from behind the grill, and access to it is thermostatically controlled.

Mark

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Had mine for year with 37s runs at 206 have you checked your Trans fluid not meaning for that to sound smart but