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2007 Stratos 486 FS
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13,614 Posts
Discussion Starter · #1 ·
Ok...a buddy of mine and I have differing opinions on this, and I'm ready to call the GM dealership to confirm either way.

We both own GM trucks/SUV's and tow boats with them. He tows in OD on the freeway, I always tow in 3rd gear, so it won't kick into OD. Which is better for the tranny?
 

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I've seen this debate on several diesel sites. With today's computer controlled drivetrains, there is no reason to lock out the OD, assuming that the computer is not seeking back & forth between OD & 3rd. If the trans keeps shifting, then yes, shut down to OD, otherwise, leave it up to the computer.

Good thread on the subject:
http://forums.thedieselstop.com/ubbthreads/showflat.php?Cat=&Board=UBB16&Number=1708778&Forum=f16&Words=overdrive&Searchpage=0&Limit=25&Main=1705642&Search=true&where=bodysub&Name=&daterange=1&newerval=1&newertype=y&olderval=&oldertype=&bodyprev=#Post1708778
 

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Shake, my Jimmy has a 'tow' button it, and the only time I use it is if I'm towing in mountains, as it keeps the tranny from upshifting and downshifting. All other times I'm in standard drive mode.
 

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2007 Stratos 486 FS
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13,614 Posts
Discussion Starter · #4 ·
Cool! You guys prolly saved me a ton in gas this weekend :) Now I owe someone a beer :(
 

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Every truck is not the same,in your owners manual it will tell you if it is ok or not.I would check!!
 

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No reason to tow in OD unless, as others have noted, the tranny continually shifts up and down. I towed 27 foot travel trailers all over with my Suburbans which had the standard, not low ratio gears that were recommended for towing. Never had a tranny problem but also learned when to manually downshift. The auto manufacturers will always note the condition which affords the best solution for those that don't tow regularly.
 

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2007 Stratos 486 FS
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13,614 Posts
Discussion Starter · #9 ·
Yeah I'm covered there...even have a more tow friendly rear end in the truck. We were just uncertain about the consequences of towing in OD.

Thanks for the help guys.
 

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Ok so iam towning a 14' glass boat with tiller motor. Tow vehicle is a 99 GMC jimmy should i be in OD with the tow haul switch on. Or just in OD it seems to do a little better with the OD and the tow haul switch on.
 

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the tow mode is for towing a load thats at least half of your towing capacity,or so it reads on my safari van. i tow less than half and use od.
 
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