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Old 09-23-2019, 02:12 AM   #21
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Originally Posted by The Gritz Carlton View Post
Just judge it on how the MH acts. On fairly level roads, towing should be fine. If you enter hills and shifting starts dancing around, turn it on. It changes the shifting patterns.
I agree with Gritz's statement. If you feel the need for engine braking use it. Pulling a hill and want the trans to hold the gear it is in longer, use it.
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Old 11-14-2019, 05:38 PM   #22
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This is a bit of a confusing thread and Iím probably misreading.

Iíve got T/H on my RV. We just drove from Texas to WV. Didnít engage it as we didnít know what it is / does.

On downgrades, depressing the brake caused a downshift. Giving it some gas at the end caused the tranny to upshift.

At the end of our trip we hit a 10 degree grade for 3 miles. I used the brakes (and the auto downshift) but half way down the brakes were screaming. We pulled over and let them rest for a few. The smell was bad. Iím hoping that we didnít damage the brakes.
When I got home, going down my short driveway they made a quieter noise but still a noise when applying.

Would engaging T/H have prevented my brakes from overheating?

Wouldnít this red line my engine?
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Old 11-14-2019, 05:44 PM   #23
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You may have 'glazed' the brakes. I would get them checked.
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Old 11-14-2019, 05:55 PM   #24
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Originally Posted by WearyTraveler View Post
This is a bit of a confusing thread and I’m probably misreading.

I’ve got T/H on my RV. We just drove from Texas to WV. Didn’t engage it as we didn’t know what it is / does.

On downgrades, depressing the brake caused a downshift. Giving it some gas at the end caused the tranny to upshift.

At the end of our trip we hit a 10 degree grade for 3 miles. I used the brakes (and the auto downshift) but half way down the brakes were screaming. We pulled over and let them rest for a few. The smell was bad. I’m hoping that we didn’t damage the brakes.
When I got home, going down my short driveway they made a quieter noise but still a noise when applying.

Would engaging T/H have prevented my brakes from overheating?

Wouldn’t this red line my engine?
"Would engaging T/H have prevented my brakes from overheating?
Yes, you only have to use the brakes briefly but firmly, maybe 3 times in 3 miles.

Wouldn’t this red line my engine?"
The V10 is a high rpm motor, it won't hurt it.
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Old 11-14-2019, 06:19 PM   #25
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I agree.
There are also rev-limiters in place that'll keep you from over-revving the V-10 anyway.
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Old 11-14-2019, 07:25 PM   #26
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I don't have a MH but my truck has TH. If the trailer is hooked up The TH is on and the tyranny is kept in 5 gear. It changes the tyranny shift patterns and has nothing to do with the brakes.
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Old 11-14-2019, 08:24 PM   #27
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I know that you didn't mean to type it...
But somehow: I have to believe that "tyranny shift" is appropriate!
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Old 11-14-2019, 08:35 PM   #28
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Thank you all - again!
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Old 11-14-2019, 08:48 PM   #29
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Originally Posted by WearyTraveler View Post
Wouldn’t this red line my engine?
The red line on the Triton V-10 is 5,200 rpm (two and three valve engines). The engine ECU (engine control unit) will always limit the engine to this maximum, on or off throttle. Even if you manually shift into second gear on a steep downgrade and the coach and toad gradually increase speed to 5,200 rpm, the transmission will up-shift 3rd gear. As soon as you decelerate down to about 3,600 rpm the transmission will downshift back into 2nd.

If I am approachable a decent over 6%, I always shift into 2nd and modulate the throttle to maintain about 35 mph (4.30:1 rear axle with 33" dia tires) using the engine and brakes to show down of the 15 mph curves. Always better to go show and be able to avoid a deer or errant car than to keep up with traffic. Of course I have a light weight coach and toad (21,50 lbs total). Slumguillion Pass on CO-149 will teach you how to manage the throttle, gear shift lever and the brakes.
As stated before, T/H mode does several things: increases the internal transmission pressure to allow faster, surer shifts; holds the transmission longer in a lower gear before allowing up-shifts; increases the average up-shift points by about 15%; and revises the downshift protocol.
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