Last post on Nov 19, 2013 at 10:09 AM
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Chevrolet Silverado 1500, Chevrolet Silverado 2500, Chevrolet Silverado 3500, GMC Sierra 1500, GMC Sierra 2500, GMC Sierra 3500, Transmission, Truck
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#1483 of 1521 2012 chevy silverado, 1500
May 16, 2013 (4:30 am)
hello, my truck when you slow down to turn, around 10 mph, then step on the gas, it feels like the transaxle, hits hard, is this caused by the transmission shift patterns, the dealer says, it is learning , my driving patterns, Really at 10,000 miles, is this a programing issue, the engine is a 4.3 it up shifts and down shifts great, just annoying to turn and stepping on the gas, worried this is going to affect u joints or the rear end
#1484 of 1521 Re: Trans design is junk [jjacks]
May 17, 2013 (3:20 pm)
Put Amsoil transmission fluid in (better cold performance) and buy one of these-
The AFM is part of the reason for the jerks. Get the one that will keep it in V8 mode.
It will make your truck more pleasant to drive.
#1486 of 1521 2005 GMC 1500 Parking problems
May 13, 2013 (10:26 am)
At times it is very difficult to put my truck in "Park". Its seems like the vehicle has to drift an inch or two before I can put it in "Park". I'd like to see if anybody else had this problem. I haven't tried replacing anything yet. Could it be the neutral safety switch or the parking pin in the tranny?
#1488 of 1521 Re: Trans design is junk [jjacks]
May 23, 2013 (9:51 am)
Apparently my last post with one swear word in it was too much for the moderator, and my post got deleted. Sorry for being too "descriptive" of what I think of GM transmissions. Anyway, I will reiterate what jjacks says. I think he is spot on. On top of all the jerkiness, I have experienced situations where the transmission on my 2011 Sierra 1500 failed to upshift from 1st to 2nd, and then slammed into 3rd. I am also convinced all the programming to manage torque (aka torque management) makes overall driveability worse, because it affects both the transmission and the throttle input (regardless of what my right foot is telling the engine to do). I will gladly take a pre-2007 GM truck over anything made today. I have 1200 miles on my 2013 Sierra 1500 now, and aside from the axle bearing GM forgot to install in the right front axle, which destroyed the axle, axle tube, and seal, my drivers side door panel squeaks and creaks every time I touch it. There is also some weird harmonic when I turn at more than 20mph (like an exit ramp). I think quality control has gone way down as well as the engineering. GM better get its act together soon.
#1489 of 1521 Re: Let's reel it in just a tad, please [kcram]
May 23, 2013 (12:03 pm)
You buy a 40K plus truck and it does get personal when you can't get it fixed!!!!
#1490 of 1521 Transmission Shudder
May 27, 2013 (4:28 pm)
I have a 2005 Sierra 180000 miles transmission shudders in 3-4 gear. Watching the tach the RPM's go up slightly when the shudder happens. Fluid looks clean would this be a mechanical problem or a solenoid . When using the tow switch it doesn't have an effect on the problem.
#1491 of 1521 Re: Trans design is junk [jjacks]
May 27, 2013 (5:37 pm)
Wow...I hate reading this. I just bought a preowned 2011 GMC Terrain with the 6-speed transmission. Im experiencing the same exact issues as you and I also feel like horrible programming is one of a few issues here. Hopefully a ECU update can atleast even things out a bit. If not I'll have to look for a custom tune. I really wish GMC would remedy this!
#1492 of 1521 The transmission design is fine
May 27, 2013 (10:25 pm)
There is nothing wrong with the 6L80/90 transmissions. They are light years ahead of the old 4l60e's. Perhaps you got a lemon. Or perhaps you are trying to fix something that isn't broken. Some suggestions for a 'fix' are not a good idea. Don't use a non GM spec oil to "fix it"... GM Dexron VI oil is designed for the six speeds and is good for 100K miles in normal service (50K miles for severe conditions). The suggestion to use a 'tuner' (re-programmer) to change the AFM and transmission computer is also a poor recommendation. The use of a tuner will instantly void the 100,000 mile drive train warranty.
They do shift a bit hard when new and they do 'learn' driving style, but are biased for fuel economy. If you suddenly change the way you are driving... the transmission will be confused and shifting may be erratic. To force the computer to relearn your style, disconnect the battery for at least 30 minutes. It took at least 20K miles for the shift quality to smooth out on my 2010/5.3L. My only complaint with the transmission is with the way manual mode works. I think GM needs to re-think the way they do manual mode and let the driver force the transmission to start in 2nd or 3rd for snowy conditions. But that is a minor annoyance. Overall, I am quite happy with my 2010 Silverado and would buy it again.