Towing up Mountain Pass - 210F Engine and 199F Transmission

[adventurenali92]

An update - winter towing 5300lb trailer transmission temps....

Just did a 700mile trip thru Southern OR - Northern CA with several mountain passes. Ambient was around 55F. The transmission temp has a base of ~152F driving flat down I-5 at 65mph. Going up a few 10mile, 5-6% grade, mountain passes the transmission ranged from 175-180 as the peak at the top of the climbs.

That’s great performance! I live in socal but my 2006 XL Denali sees a lot of the central and nor cal mountains when traveling for snowboarding. Though I haven’t towed anything up there yet.