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Old 12-09-2010, 04:21 PM   #1
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How hard to you push your vechile while traveling?

I finally got my first TT and found out it loves wind! I may have to nickname it “My Sail”. Anyways I have 2005 GMC sierra 1500 which is 4 speed tranny. I found that running in 4th gear it falls on its face and no power in wind or with no wind. I found running in 3rd is best choice even though some hills it will slow way down. I run about 2600 to 3000 RPM in third. The kicker is I have to be above 55 miles a hour or my power range is horrible and maybe have to go down into second. My truck is 7000 GVWR and camper is 5500 dry.

Okay the question is here? First of all am I beating on my truck or just towing nice and heavy? Or is this normal with a 1500 truck.

Second is how do others drive in wind? Do you prefer to go easy on truck? Or its fine to push it hard. Any info to ease my mind that this is okay for my truck ?
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Old 12-09-2010, 05:00 PM   #2
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I experienced the same issues when I had a boat and a 2005 Denali SUV. The engine was either screaming or bogged. This was with a boat of 4500lbs and this behavior was on hills, which I am surrounded by here in Tahoe.

No doubt that running the high rpm's will effect engine life in the long term, not to mention horrible MPG.

My solution was to get an SUV that had the 6 spd tranny, and it was like night and day.

Now with regard to my TT which I got last year, the "sail" alone is one mileage killer, and depending on the wind direction, another 2-3 mpg hit. The 6 spd in tow mode basically keeps the truck from going into 6th, with higher rev shift points. But so much better than the 4 spd's all or nothing approach.

This is a good excuse to trade in the truck for a newer one with either a 6 spd, or better yet, get a diesel. Help the economy out a bit!
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Old 12-09-2010, 05:09 PM   #3
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Quote:
Originally Posted by Borwick View Post
I experienced the same issues when I had a boat and a 2005 Denali SUV. The engine was either screaming or bogged. This was with a boat of 4500lbs and this behavior was on hills, which I am surrounded by here in Tahoe.

No doubt that running the high rpm's will effect engine life in the long term, not to mention horrible MPG.

My solution was to get an SUV that had the 6 spd tranny, and it was like night and day.

Now with regard to my TT which I got last year, the "sail" alone is one mileage killer, and depending on the wind direction, another 2-3 mpg hit. The 6 spd in tow mode basically keeps the truck from going into 6th, with higher rev shift points. But so much better than the 4 spd's all or nothing approach.

This is a good excuse to trade in the truck for a newer one with either a 6 spd, or better yet, get a diesel. Help the economy out a bit!
Thanks for response plus the wife wants a SUV. I thought about a 2500HD 6.0 gas truck but unsure. I guess I will see how camping season goes as I got some time.

Is this hard on tranny running in 3rd?
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Old 12-09-2010, 05:16 PM   #4
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Thanks for response plus the wife wants a SUV. I thought about a 2500HD 6.0 gas truck but unsure. I guess I will see how camping season goes as I got some time.

Is this hard on tranny running in 3rd?
Actually, it is probably better on your tranny to run in 3rd. Running in 4th gear (OD) with a load, and the transmission is going to be shifting trying to hunt for the correct gear. A lot of shifting is not good on a transmission. If my truck starts shifting a lot in OD, then I will lock out the OD.

What kinda hills are you pulling ?? Right off, I would think maybe you have a high ratio final drive, but you stated that the truck is 2600 to 3000 rpm in 3rd. I think my truck rpm is in that area going 65 mph with the OD locked out, and I have 3.73s.
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Old 12-09-2010, 05:20 PM   #5
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That question is best answered by an engineer or auto-tech. In 3rd, your engine is running higher rpm's, but the tranny may not really care.
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Old 12-09-2010, 05:21 PM   #6
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My next truck is a 1 ton GMC diesel, rated at 21,000 lbs towing. No worries then!
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Old 12-09-2010, 05:23 PM   #7
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Actually, it is probably better on your tranny to run in 3rd. Running in 4th gear (OD) with a load, and the transmission is going to be shifting trying to hunt for the correct gear. A lot of shifting is not good on a transmission. If my truck starts shifting a lot in OD, then I will lock out the OD.

What kinda hills are you pulling ?? Right off, I would think maybe you have a high ratio final drive, but you stated that the truck is 2600 to 3000 rpm in 3rd. I think my truck rpm is in that area going 65 mph with the OD locked out, and I have 3.73s.
As far as hills nothing major. I do go a little faster like 65-75 MPH just so Im in the right power range for 3rd gear. As far as the final gear I am unsure. All I know is a new truck or new gears is a lot of money. I think for now I would rather limp along. I just wanted to know if it's fine for maybe a couple years.
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Old 12-09-2010, 05:47 PM   #8
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As far as hills nothing major. I do go a little faster like 65-75 MPH just so Im in the right power range for 3rd gear. As far as the final gear I am unsure. All I know is a new truck or new gears is a lot of money. I think for now I would rather limp along. I just wanted to know if it's fine for maybe a couple years.
If your RPMs are in that range at 75 mph, then that might be an indication of a high final drive ratio. You can probably give the VIN to your local Chevy dealer, and he could tell you what that ratio is.

The faster you go, the more wind resistance you are going to have. I can't remember the exact formula, but it is something like when double your speed, the wind resistance is squared. My truck just lops along at 55 mph, and at 65 I can tell it is working harder, even though the rpms are higher up in the horse power curve. I can tell a big difference is mileage

Beware, ST tires are rated at 65 mph maximum speed.
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Old 12-09-2010, 05:49 PM   #9
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I am getting 7.5 miles to a gallon. A little disappointing but I bought the truck to use it. I do believe final drive is too darn tall. But changing it out will be thousands.
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Old 12-09-2010, 06:00 PM   #10
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I couldn't imagine a total melt down in a couple of years. Depending on how much you use the TT, the worst you will experience is frequent fill-ups and high-revving sound effects.

My wife wishes the breaks were closer together anyway, as she needs a pitt-stop twice as much as I do.
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