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  #21  
Old 05-13-2013, 08:05 PM
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BrianM BrianM is offline
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Quote:
Originally Posted by djkslc View Post
Some clarification, so this doesn't become a you're driving too fast thread -

I could pull it (my 08 Tahoe) 75 up and over with no problems at 3/4 throttle because it had a proper downshift, plenty of power, no problems, hardly felt it was there.

This Yukon I was going 40 mph pedal to the floor (in tow/haul mode) in the right hand lane with flashers on while it dropped below 2k rpm's before downshifting. On the way back I did it in Manual and didn't have the downshifting issues because I was controlling it, but it did feel like I was pushing it a bit.

A local shop suggests a "super chip flashpaq" to reprogram the computer when I am towing. He thinks I am programed to be in what he called "economy mode". It sounds like a good idea especially when I am done towing I can easily reprogram it back to "economy mode" as a grocery getter. Any thoughts on this idea?
Something is wrong. Take it to the shop.
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  #22  
Old 05-13-2013, 08:36 PM
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j.mccreight@hotmail.com j.mccreight@hotmail.com is offline
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Quote:
Originally Posted by djkslc View Post
I traded in my wife's 08 Tahoe 5.3 motor with 100k miles for a 12 gmc Yukon 5.3 l with 15k miles. I towed my 02 xstar yesterday for the first time yesterday. The tow includes a large climb over parleys summit. This gmc would not down shift the way my 08 Tahoe did. I was in tow/haul mode and had the gas pedal down all the way and the down shift took forever. I could do 65 or so up and over the summit in my 08 and I was struggling to be at 50 in the gmc due to the fact it didn't down shift to keep the speed consistent. What am I missing
Your truck is broken, take it to gmc dealer as it's under warranty and don't do any aftermarket programming, they'll void your warranty if they find the program and blame the transmission failure on the program(trust me I work for a chevy/nissan dealer and the domestics are always looking for ways to turn warranty into customer pay). To me sounds like you have a valve body or tcm issue.
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  #23  
Old 05-13-2013, 09:18 PM
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orbeamlb orbeamlb is offline
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Quote:
Originally Posted by jraben8 View Post
Definitely take it in to be looked at. I bought a '12 Avalanche about 8 weeks ago. 5.3 but with the 3.42 LS gears. This thing will downshift unloaded on any decent hill on most highways around DFW.
My '11 Suburban has same powertrain and rear gear Pulls very well up and down the hills here in Austin.

Definitely bring it to the dealer.
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  #24  
Old 05-14-2013, 06:38 PM
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2012X45 2012X45 is offline
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Quote:
Originally Posted by Miss Rita View Post
Why would you stress your Tahoe to maintain 75 mph uphill? You must have had it floored; seems like you're flogging it a little. Not to mention that ST tires are rated to 65 mph.
65? Hahahahaha. Who drives 65 on the interstate? Mine tows great at 80.
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  #25  
Old 05-14-2013, 07:07 PM
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Miss Rita Miss Rita is offline
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I would refer you to post #13.
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  #26  
Old 05-14-2013, 08:00 PM
Indyxc Indyxc is offline
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Quote:
Originally Posted by Miss Rita View Post
Why would you stress your Tahoe to maintain 75 mph uphill? You must have had it floored; seems like you're flogging it a little. Not to mention that ST tires are rated to 65 mph.
Not my vehicle, and at that moment I wasn't driving. Typically, I agree. I just picked up my x2 and drove from Arkansas to Michigan with a 2500 6.0 Express Van. I did a nice and steady 65 mph, and it rocked. 14 mph towing it, I was very impressed.

The 6.0 and 6 spd were great.
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  #27  
Old 05-19-2013, 12:28 AM
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gotjag941 gotjag941 is offline
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Done 90 plus with many boats couldn't imagine going 65 on the highway with a tow boat
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  #28  
Old 05-20-2013, 02:59 AM
wishart wishart is offline
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Might just have to get used to the 6 speed trans....I just traded in my2008 gmc Sierra with 4.8L 4speed auto trans for a 2013 chevy silverado with 5.3L 6speed auto trans and it feels sluggish!!! I talked to a gmc service writer about my concern, and it is a common complaint! I've got 200 miles on the new truck and am learning how to drive it better. I haven't towed with it yet though....I was disappointed with my new truck also.... The more I drive it the more I am getting used to the characteristics of the new system.
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  #29  
Old 05-20-2013, 04:40 PM
Cloaked Cloaked is offline
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Quote:
Originally Posted by wishart View Post
Might just have to get used to the 6 speed trans....I just traded in my2008 gmc Sierra with 4.8L 4speed auto trans for a 2013 chevy silverado with 5.3L 6speed auto trans and it feels sluggish!!! I talked to a gmc service writer about my concern, and it is a common complaint! I've got 200 miles on the new truck and am learning how to drive it better. I haven't towed with it yet though....I was disappointed with my new truck also.... The more I drive it the more I am getting used to the characteristics of the new system.
Bingo.

I recently went from a Duramax/Allison to the gasser 6.0/6-speed setup. It does require re-adjustment to the different shift-points, etc... I use the tow haul mode then the downshift button to control the shifting. I am hoping GM will come out with an ECM flash to reset the shiftpoints and performance on the weak 6-speed tranny. The 2012 GMC tranny is disappointing but everything is relative and I am comparing to the fine Allison transmission. Been in my new 2500 a year now with 2,100 miles. Still giving it an chance but I think poster wishart is on the money....

$0.02

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  #30  
Old 05-21-2013, 10:44 AM
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stuartmcnair stuartmcnair is offline
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definitely something wrong with that truck. Easy to fix though. Drive it to a Ford dealer and trade it in on an Expedition. Problem...solved.
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