5.0 Engine Brake Question?
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Fleet Mechanic
Joined: Jul 2003
Posts: 1,570
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5.0 Engine Brake Question?
I towed the smallest UHual two Axle through the mountains from Virginia to Kentucky. When I was going downhill and braking the truck would downshift and the Engine would Rev. one time it went to 5 grand. A little bit scary for a Flat Lander. I was not using the Cruise Control. Was this normal. Also after I dropped the trailer off and headed back home it did this while using the Cruise Control, but not as severe Engine Revs. The trailer brakes were working fine and I had no problems with the trailer or the way it was loaded. I have a lot of experience towing trailers that were owned by a Company I worked for in the past, they had Electric Brakes, and I’m tuned into the slight tug they have.
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Fleet Mechanic
Joined: Jul 2003
Posts: 1,570
Likes: 20
I was in Tow/Haul Mode, and did not use Cruise Control while Pulling the Trailer. I used it on the trip home. That turned out to be very interesting, we Routed ourselves away from any major cities, due to the Protest that are going on. Drove into a mess, several years ago, on an Interstate. Never again!
Logistics Pro
Joined: Oct 2004
Posts: 4,738
Likes: 103
From: FL
Even unladen, tow/haul mode will downshift and provide engine braking. I use it descending long/steep graded to stay out of the brakes.
A downshift resulting in 5k+ RPMs isn't an issue or cause for concern.
A downshift resulting in 5k+ RPMs isn't an issue or cause for concern.
Lead Driver
Joined: May 2015
Posts: 5,871
Likes: 357
From: Mts. S. of San Francisco
+1 When you're in tow/haul or sport mode, the automatic downshifting can get somewhat aggressive (for lack of a better term).
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Senior User
Joined: Nov 2008
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From: Cle Elum WA
Unless I was scared to death I wouldn't do to mine.
A long 7 or 8 percent grade maybe....other than that I would drive it, not giving advice, this is just me.
These parameters are designed into these trucks to keep novices safe, at the expense of wear and tear on the truck, let it work as designed, everybody's skillset and experience is different.
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Logistics Pro
Joined: Oct 2004
Posts: 4,738
Likes: 103
From: FL
Full engine vacuum at 5k+ might suck up some oil
Unless I was scared to death I wouldn't do to mine.
A long 7 or 8 percent grade maybe....other than that I would drive it, not giving advice, this is just me.
These parameters are designed into these trucks to keep novices safe, at the expense of wear and tear on the truck, let it work as designed, everybody's skillset and experience is different.
Unless I was scared to death I wouldn't do to mine.
A long 7 or 8 percent grade maybe....other than that I would drive it, not giving advice, this is just me.
These parameters are designed into these trucks to keep novices safe, at the expense of wear and tear on the truck, let it work as designed, everybody's skillset and experience is different.
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