OK To Drive In 3rd Gear All The Time? - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum



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Go Back   Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum > 2002 - 2009 TrailBlazer/Envoy Tech > 02-09 Vortec 4.2L I-6 Engine and Drivetrain > 4x4 Drivetrain

4x4 Drivetrain 4x4 Repairs & Problems

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  #1  
Old 01-27-2008, 02:28 AM
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OK To Drive In 3rd Gear All The Time?

Hi guys, I was wondering...........I live in Upstate, NY where it's mountainous and often find myself dropping into 3rd gear on the highway. Is it OK to drive in 3rd gear all the time? Will it consume that much more gas? Bad for the engine? Thanks!
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  #2  
Old 01-27-2008, 07:54 AM
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It shouldn't hurt anything, but you will notice a drop in MPG. It's actually better to hold the transmission in direct drive (3rd) on hilly terrain than to have it frequently searching for the right gear. Frequent shifting causes heat and heat is a transmission's #1 enemy. However, if you do get on some flat roads for a while above 55 MPH or so I would suggest using OD for the MPG gains.
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Old 01-27-2008, 09:32 AM
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Originally Posted by Rottie View Post
It shouldn't hurt anything, but you will notice a drop in MPG. It's actually better to hold the transmission in direct drive (3rd) on hilly terrain than to have it frequently searching for the right gear. Frequent shifting causes heat and heat is a transmission's #1 enemy. However, if you do get on some flat roads for a while above 55 MPH or so I would suggest using OD for the MPG gains.


Being that you're transmission is searching all the time going up those hills, you might not lose too much fuel mileage by keeping it in 3rd all the time. Like Rottie said, on the highway I wouldn't drive on 3rd.
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Old 01-27-2008, 09:48 AM
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i live in northern utah, i had this same issue, so i bought a tune and the searching is gone, noew if you try and lag the truck it will still search for the gear, but its much better now if you just drive it....

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Old 01-27-2008, 09:52 AM
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No problems. I use an old Silverado as my work truck and tow a 3500# trailer all day. I always leave it in 3rd. while towing. As others have said, a little less mileage due to increased RPM but no worries.
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Old 01-27-2008, 02:32 PM
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Cool, thx...I also have a Westers Tune and like to leave it in 3rd for the added OOOMPH!
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Old 01-27-2008, 02:55 PM
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They found your TB?
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Old 01-28-2008, 01:13 AM
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They found your TB?
Ya, I updated the thread!
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Old 01-28-2008, 07:40 AM
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I drive in 3rd alot too mostly on hilly roads, but i go back to OD when i hit the highway. Staying in 3rd shouldn't hurt anything.
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Old 01-28-2008, 02:28 PM
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yup. manual says its ok to drive in 3rd.
BUT mileage will decrease.
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