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Discussion Starter · #1 ·
After 30-40 min of highway driving my tranny temp has been between 130-145 which is at the 3/4 mark on the gauge. Is this normal for you guys? Post your temps if you can for similar driving! ~Thanks~
 

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That is on the low side of what I am used to with other transmissions. My three speeds would be around engine temp with the four speeds about the same. The nine speed doesn't have to work as hard, so it's temps would be lower.
 

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Took a two hour drive on the highway semi-hilly, but not a lot of shifting trans temp got up to 170 (a little over 5/8) after about an hour, but remained steady for the second hour.
 

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Discussion Starter · #7 ·
awesome, thanks guys!
 

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Just took a road trip from Cleveland OH to Charlotte NC all down route 77 roughly 7-7.5 hours and only stopping to fill the tank. I noticed throughout OH the trans temp stayed right at 171. Once I got into WV and was doing a lot more shifting with the hills, it climbed up to 186. Once I noticed it at that temp I tried be a little more cautious on the shifting.

The temp dropped back to 176-181 and remained there for the rest of the trip. Now the Jeep was moderately loaded up doing 75ish. Kinda worried me being as the air temp was in the 50's, how high would it get when the air temp is 90 on the same trip.

Was at the dealer for something else, but asked the service manager and he said its not a concern until it exceed the coolant temp (generally over 200)
 

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Around 80°C (176°F) is generally considered normal operating temperature for automatic transmission fluid. Anything over 90°C (194°F) is getting too hot. Transmission fluid, like engine oil, thins out with increasing heat, and wear protection will begin to decline. The change in viscosities can also cause functional problems with the transmission. Hauling your whole family, a large picnic basket while towing your boat up a mountain in Nevada on a hot summer day is probably a bad idea. An additional or larger transmission cooler helps keep the transmission cooler.
 

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Anything under 220-230 degrees (F) is considered acceptable. Limiting it to 194*F is ridiculous.
I would say 105°C (220°F) - 110°C (230°F) is borderline normal if you are going uphill or towing, or during prolonged high-speed driving on the Autobahn, but I would certainly consider it above what I expect under normal operating conditions. YMVV.
 

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From what I was told but this transmission is not like your typical 4-5-6 speeds (well we obviously know this) but it also should be operating at a lower temperature then other transmission.

Per some information from some Cherokee owners with the 9 speed, if the temp reaches 204F then an electric fan kicks on. They say its very loud and noticeable if its on or not. A few have said if that fan was coming on, in normal driving conditions, the transmission failure was likely soon to follow.
 
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