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Old 06-14-2018, 07:45 PM   #1
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Brand: Thor Motor Coach
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Tow Haul button

I saw someone post about using the tow haul button going downhill. Can someone elaborate on this for me.
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Old 06-14-2018, 07:48 PM   #2
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From my limited experience with it:
If you engage the Tow/Haul Mode, and tap the brakes: the transmission will downshift a gear for you...
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Old 06-14-2018, 10:15 PM   #3
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Tow/Haul is designed to keep you from burning up your brakes by letting the engine/transmission do all of the work. It will downshift for you with a tap of the brakes and then the higher RPMs help slow you down.
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Old 06-14-2018, 10:25 PM   #4
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From what I've been able to figure out: the V-10 likes to rev a bit... and the computer management system won't let you downshift it to the point where you can hurt it.
I've got some hills around me, where I end up "tapping it down" two or three gears.
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Old 06-14-2018, 10:59 PM   #5
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Tow/haul increases the transmission clutches engagement pressure, making the shifts more rapid, thus decreasing trans temperature. It also reschedules the shifting parameters; this allowing the transmission to stay in a lower gear for longer. The computer (ECU) limited max RPM is 5,250 rpm for the Triton V-10. My coach will shift into sixth at 48 mph (1,450 rpm) with no load on the engine with the tow/haul off. With the tow/haul on, it will not shift into sixth until 68 mph (2,050 rpm). I limit my towing to about 60 mph so the trans never shifts into sixth. Normal shift schedule will allow the trans to down shift down to fifth and fifth to fourth with each application of the brakes if the coach is accelerating downhill foot off the accelerator. With the tow/haul engaged, the transmission will continue to downshift each time the brakes are depressed in the coach is still accelerating. When the computer detects that a requested downshift would over speed the engine, the trans will not downshift
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