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Old 05-03-2015, 08:39 PM   #1
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Default Overdrive lockout

Hello everyone new to the forum and new to a GMC truck I have 2 other Ford trucks trucks. just have a quick question . My 2009 GMC Sierra with the 4.8 liter is almost exclusively used to tow a 6500 pound trailer and I was wondering if there was a way to lock out the overdrive because it is constantly hunting for gears while towing. Thanks to everyone in advance for any help that can be offered.
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Old 05-04-2015, 04:27 AM   #2
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I would take a good look into your owners manual. If you don't have one, often they are available free online.
I believe there is a tow/haul mode on them that probably changes shift points and may lock out the OD.
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Old 05-04-2015, 06:10 AM   #3
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I was going to say, does it not have a Tow/Haul button on end of shifter?

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Old 05-04-2015, 09:24 AM   #4
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yes mine does have a tow haul button and I use it but it does not block out the overdrive. I have discovered that if I leave it in 3rd it locks out the overdrive as like with my fords if I put it in the two or three gear it starts in that gear and stays in that gear but I see with GM it is different. So I guess problem solved
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Old 05-04-2015, 05:17 PM   #5
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6500 lb trailer, I hope you have an external trans cooler.
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Old 05-05-2015, 08:46 AM   #6
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no I don't but I only pull it 10 miles one way last time I pulled it the transmission got to 203
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Old 05-05-2015, 05:47 PM   #7
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I guess that'* OK?
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Old 05-05-2015, 05:58 PM   #8
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Yes you should be ok when pulling the short distance then.
203F is just nicely warmed up.
How often do you pull the trailer, occasionally?
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Old 05-05-2015, 06:10 PM   #9
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203 is kinda ok. Granted, its a short run. But, anything less than 200 is ideal.
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Old 05-05-2015, 07:34 PM   #10
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You should be able to shift to '3' to keep it out of overdrive, which, assuming you have a 4 speed transmission (I think only the 3/4+ ton had the 6 speed), will accomplish exactly what you are looking for. Ford is notorious for calling it Drive and Overdrive, as well as older GM as well, but now 3 is the same thing, it stops shifting past 3rd gear.

If it'* not, then there is something wrong and we can help track it down.
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