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Old 06-15-2014, 06:32 PM   #1
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Lots of TV Downshifting

Just took out our new 27DSRL and towing with 2012 Silverado 1500 5.3l w/3.42 rear end. TT weight as delivered was about 6000 lb. Towing down a fairly level hwy with some slight hills at 60mph in tow/haul the TV seems to downshift a lot. I have never towed before except for an 1800lb pop up. Downshifting is annoying. TV is rated to tow 9700lbs. Anyone else with similar TV & TT notice the same? DW thinks I need a bigger TV (I find it hard to argue that!)

2015 Jayco 27DSRL
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Old 06-15-2014, 06:37 PM   #2
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Have you tried shifting out of overdrive? With my 4 speed transmission I just switch to 3rd gear if the transmission is hunting for the right gear against a stiff headwind or in hills.


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Old 06-15-2014, 06:47 PM   #3
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Unfortunately the 3.42 gear isn't helping under towing conditions, the 3.42 gear is great for the highways under a no-load condition. I think you will find that most folks prefer the 3.73 gear with the 5.3L for towing.

If you find the transmission hunting for a lower gear often, then like "Crabman" mentioned you need to be in a lower gear otherwise you will find your transmission heating up.

If you get a chance, a visit to a CAT scale will tell you how you stand with your weights, and confirm that your WDH is adjusted correctly. If you find that your at your TV's weight limits (GVWR), this will also factor in to how the transmission behaves.

CAT scale how to: http://www.jaycoowners.com/forums/f37/how-to-weigh-your-tv-tt-3871.html


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Old 06-15-2014, 09:59 PM   #4
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Lots of TV Downshifting

Originally Posted by rustic eagle View Post
unfortunately the 3.42 gear isn't helping under towing conditions, the 3.42 gear is great for the highways under a no-load condition. I think you will find that most folks prefer the 3.73 gear with the 5.3l for towing.

x 2.
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Old 06-15-2014, 10:58 PM   #5
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We have the same truck and our trailer weighs 6600 lb loaded. We had no issues towing - last winter went from ON to CA. There were some good grades. Most of the time the truck was in 5th at around 200 RPM. On long grades it would shift down and the engine would rev up to 3500 or very occasionally higher. You could certainly hear the engine then but those RPM's are not a problem for the motor. We did not experience the transmission hunting for gears.

The engine braking worked as it was supposed to on long steep down grades. The transmission will shift down to hold the speed.

I never used the Manual function for the tranny - just tow/haul.

The trucks with the 3.42 6 spd have a better selection of ratios the the older 3.73 4 spd (had one of those).

No question a 2500 D/A would run at lower RPM's and shift down less. If your wife wants one go for it but what you have should work fine based on our experience.
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Old 06-15-2014, 11:03 PM   #6
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Honestly I had a 23 foot trailer and a Chevy suburban with a similar setup as yours and frankly it didn't pull good at all, just as you are describing, I finally gave up on the half ton chassis and bought a diesel. Of course then it was like riding in a parade so I had to upgrade the trailer too...

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Old 06-15-2014, 11:22 PM   #7
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As mentioned, keep it out of OD and start shopping. You may not need a diesel but a 3/4 ton with a bigger engine and different differential gears will make towing a lot easier.
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Old 06-16-2014, 05:45 AM   #8
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Are you using the tow/haul mode? Another option is to give Blackbear Performance a call. Justin can customize your shift points for your vehicle and adjust the engine/transmission to work together more efficiently. Cheaper than a new truck. But hey, If the wife says you should buy a new truck, who can argue with that? Gotta keep her happy!
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Old 06-16-2014, 07:56 AM   #9
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Yeah, if DW is greenlighting a new truck, that's where I would go. I LOVE my truck, but for what I want to do in the long-run, I need a bit more. For my setup, it's JUST enough truck, I don't have much margin.

I have the same truck as you (Sierra) and I tow a 28BHBE that weighs about 7500 lbs loaded for a trip. On flat even terrain, I can just drop it into drive, hit the T/H button and I'm good to go. It'll chug along 60 MPH in 5th gear at about 2K RPM.

HOWEVER, when I get into rolling terrain, it likes to shift down to 4 at the slightest hint of a grade, and sometimes 3 on the steeper grades. This past weekend I was towing and fiddling with things and discovered that I can drop the tranny into M4 with T/H engaged and tow at about 60-65 MPH and 3K on the Tac. The motor makes a bit of noise, but like you said, those revs won't hurt anything with this motor, and the transmission hardly shifted after that. The truck and transmission seemed to do REALLY well at this speed in M4. I just pushed the pedal a little to pick up some speed in the down hill to compensate for the bleed-off in the uphill.

Good luck with whatever you decide!

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Old 06-16-2014, 10:05 AM   #10
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The BIL tows a 24 foot Terry Expo ('98) with a Durango with a 4.7L and 3.42's. He always tows in OD (although I advise against it, he says it hardly ever gets into OD). He says on steeper grades, it downshifts into 2nd.
What I have found works for me with the Tahoe and 31 footer (or really any RV I have towed with it) is put trans in manual 3, tow/haul on (except in city traffic) and cruise control off. If I keep my foot on the gas, I can control when I want it to downshift. I normally just allow the truck to slow while climbing a grade, rather than have the trans downshift. If I get below 40-45mph, I will let it downshift to get me back up to speed, I just hate raising the RPM's over 3000 for any length of time with a high milage engine.

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