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Normal. Cooling fan. My 6.4 does the same uphill.

Quick update. Made it just fine. Up several long (guessing 6%) grades and was able to accelerate to 55mph in the climb. 3rd gear and 4500rpms I believe. Could have gone faster but the road was rough. Yes, the fan was howling! At the loudest is was 70db. Drove 640 miles today so I'm whipped. I...

Will do

...towing 10k toyhaualer through the Eisenhower Tunnel. Truck is about 10k also. I plan on using the GoPro to record the ascent. I can display the engine instrument stack in the center of the dash (Bighorn) so I'll record that and the gear indicator. I have a cheap OBDII reader that can show...

I have 4000 miles with a 4.10 since December 2019. Towed a 10,000lb toy-hauler 400 miles roundtrip here in flat Florida at 10mpg. Plenty of grunt and smooth as silk. Unloaded in the city 10mpg. 65 on the highway 17-18mpg. 80 is 14-15mpg.

1400 miles on 6.4L 4.10/8 speed. Early flat-Florida numbers around 10mpg in the city and 15mph on the highway at 70-75. I think 17/18 is possible at 60-65.

1400 miles on 6.4L 4.10/8 speed. Early flat-Florida numbers around 10mpg in the city and 15mph on the highway at 70-75. I think 17/18 is possible at 60-65.