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What Gear are You Towing In?
I'm towing an 8,000 lb 5th wheel RV with my F350 FX4 SRW. I have the 6.4, 20" wheels, Torqshift, and 3.73 rear.
I'm towing at about 60 mph on mostly flat terrain.
I'm finding that I'm unable to shift into 5th unless I accelerate up past 65 (in 4th) and then let it slowly back off the fuel and the truck will then shift to 5th.
In addition, if I am in 5th and cruising at 60, the slightest hill or headwind will cause a downshift to 4th. The RPM at 60 in 5th is about 1600 and in 4th is about 2100. I've tried with tow/haul both on and off and haven't seen any difference.
Are any of you noticing similar behaviour? Am I better off towing a bit faster to get a little higher in the torque curve?
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2008 F350 CC FX4 SRW 6.4 Navistar
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