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Old 05-31-2015, 10:57 PM
yotanut yotanut is offline
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Join Date: Apr 2012
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yotanut yotanut is offline
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Join Date: Apr 2012
Posts: 22
yotanut is on a distinguished road
Forgive my ignorance. So in the 5th gen 4Runners in order to get a torque converter lock going up steep grades while towing, I should not be in S4, but rather in S5 or D? I just got back from towing my travel trailer up the Santiam Pass in Oregon. This is a brutal climb, as it is about 20-30 miles of nothing but incline getting to the pass, then the pass itself. My ScanGuage II was reading a TFT (Transmission Fluid Temp) of 238F at the hottest point. I was in S4, but had to drop down to S3, just to maintain ~40-45 MPH. During this climb, the tranny temp was rising fast, and after reading this thread it sounds like maybe my torque converter was not locked. While on the straight stretches or low grades, I was averaging 175F-180F.

Is it best to stay in S5 and give it more gas to lock up the converter in gear 3 or 4 when climbing? I thought being out of OD was best. Thanks for the help.
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2014 4Runner SR5 4WD Magnetic Gray
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