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Discussion Starter #1
hey all
so this weekend while wheeling, the hot oil light came on. I'm pretty sure I know what was the cause but I wanted to see what you all thought. Here's the details:
-Was going up a long climb in 4HI, 1st gear
-Yeah, I was pushing it hard on the skinny pedal
-Also had the recycle air on as it was super dusty (no AC though)
-It's a 2009 JKUR, automatic transmission, with a tranny cooler

Hot oil light came on at the mid point of the climb, so I pulled over and waited for a couple minutes. Friend suggested that I put in in 4Lo, 1st gear. That seemed to take care of it but like I said, I want to see what you all thought.
 

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Shearing of the fluid in the slipping torque converter is what generates most of the heat in an automatic transmission.

Up hill in 4hi will generate a lot more heat than up hill in 4lo.
 

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fwiw (& I run a large aux tranny cooler on my Auto slushbox JKU) , I rarely if ever use 4Hi ...if so it’s for brief spells in say ice on gravel or were I to cut across a flat grassy or corn field for a min or two.
I use 4lo so the TC is doing it’s thing , especially up hill climbs ...:jeep2:
 

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Discussion Starter #4
Shearing of the fluid in the slipping torque converter is what generates most of the heat in an automatic transmission.

Up hill in 4hi will generate a lot more heat than up hill in 4lo.

Thanks, that's what I thought and wanted to confirm.
 

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BnM 70264 is what I used on my '09 Rubi in 2016. Probably wont overheat in 4Hi now but I avoid using it for climbing. I also re-geared for 35's.
 
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