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GM 1500 Truck Transmission Failures

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GM 1500 Truck Transmission Failures

Old 03-19-2019, 11:56 AM
  #21  
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I have a 2014 Silverado. Transmission went out at 103k, warranty went out at 100k so I was stuck paying for it out of pocket. They told me the only option was to rebuild if I wanted it done soon, they couldnít get a new one because theyíre on backorder indefinitely. Iíve heard about a lot of issues with the trannyís in these trucks.
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Old 03-19-2019, 01:32 PM
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Jesus, between my own transmission shifting and all the stories, I may end up trading my truck sooner rather than late. I've was hoping to wait for the 2020 Ram HD to come out.
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Old 03-19-2019, 04:08 PM
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Originally Posted by SecondWind282 View Post
Well, I drove my wife's suv last night and when I put it into Reverse to back out it felt like I ran into/over something and made a loud clunk. "What the hell was that" I asked my wife. She says "oh, it's been doing that for over a week now." Of course, I peek down at the odometer reading 60,800 miles. So much for the 60,000 mile powertrain warranty...

I read online that it might be as simple as the Transmission Control Module.

I assume the 8 speed transmission in the Yukon is the exact same as the 1500 pickups.

Anyone else hear of this problem?
2015 is 5 year 100K powertrain warranty. In 2016 they went to 5 year 60K.
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Old 03-19-2019, 04:13 PM
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Originally Posted by Fin-isher View Post

Just seeking info...Thanks
Most GM transmission issues are because the torque converter starts breaking up, metal gets in pump ,scores the pump and damage goes from there.

The 8 speed fluid change seems to make a difference, the original fluid was very moisture sensitive and would create issues the new fluid was tested down south and finally made it's way up to the Northeast.
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Old 03-20-2019, 08:19 AM
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Originally Posted by tysdad115 View Post
Most GM transmission issues are because the torque converter starts breaking up, metal gets in pump ,scores the pump and damage goes from there.

The 8 speed fluid change seems to make a difference, the original fluid was very moisture sensitive and would create issues the new fluid was tested down south and finally made it's way up to the Northeast.
It seems there are actually two different issues with the GM 8-speed transmission.

1. The torque converter issue which causes vibration at highway speed, usually between 40-70. This is taken care by changing to an all synthetic fluid. They actually flushed mine 3 times. If that didn't work, they were going to replace the torque converter but it worked.

2. The hard downshift issue most experience when coasting to a stop. Mine does it 50% of the time at 2 mph. Although there is a TSB for this, GM has not fixed it on mine. It is unrelated to problem #1 and as I understand it has to do with some sort of mechanical / electronic mismatch with the transmission and programming.

2016 1500 with 6.2L here for a little while longer.... until I figure what non-GM truck I want.
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Old 03-20-2019, 11:55 AM
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Every one of them breaks at some point . I drove a new Dodge, new Ford ..no thanks , I'll stick with my Sierra.
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Old 03-20-2019, 01:07 PM
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Use your topsider oil extractor and evacuate the trans pan. Drop the pan, replace the filter, clean the pan with brake clean. Wipe out with a rag. Rinse again with brake clean and then DO NOT use paper towels or rags to dry the pan. Use compressed air to dry. Button it up and fill with fluid. Drive 500 miles and do another oil extraction. This gets most of the dirty fluid out. Don't drop the pan just refill and you are good to go for another 100,000. The "flushing" that the dealer wants to sell you pushes the crud into the valve body and sets you up for failure. The machine they use is nothing but a way to introduce everyone else's crud into your transmission. That's how I've done transmissions for 20+ years with no failures on GM, Ford, and Mopar.
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Old 03-22-2019, 05:00 AM
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100% right, I also use the Topsider to suck out most of the oil if the pan does not have a drain plug.
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Old 03-23-2019, 11:29 AM
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My 14 Silverado has around 107k and the transmission is real jerky. I expect it to go out at some point. Truck is really kind of a POS, but I got it super cheap.
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Old 03-24-2019, 08:05 PM
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This will not help but Iíve had 3 Silverados and all 3 had transmission problems. This and plastic interiors is why I left GM. There are better options.
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Old 03-24-2019, 09:50 PM
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I'm on my 4th Sierra. This one is a '15 SLT crew cab with 6.2L and 8 speed that I bought new. The trans has been garbage since about 5K miles with delayed and clunky shifting. I've taken it to the dealer several times to the tune of "Can't duplicate the condition." I did just hear from a buddy that GM has sent out a fix. What that is is anyone's guess.
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Old 03-25-2019, 01:51 AM
  #32  
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Have 13 chevy trucks in our fleet. The 6 speed/ 5.3 combo eats torque converters. The 4 speeds or the 2500 6 speeds are great, no issues.
no more 1500s for us, only 2500s now.
of course cant buy a new 2500 regular cab 8' bed now due to factory retooling for the 2020s. So stupid.
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Old 03-25-2019, 10:10 AM
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Originally Posted by Imlay View Post
I'm on my 4th Sierra. This one is a '15 SLT crew cab with 6.2L and 8 speed that I bought new. The trans has been garbage since about 5K miles with delayed and clunky shifting. I've taken it to the dealer several times to the tune of "Can't duplicate the condition." I did just hear from a buddy that GM has sent out a fix. What that is is anyone's guess.
I have the 6.2L / 8-speed as well. I just hope it lasts until the 2020 Ram HD comes out.
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Old 03-26-2019, 08:45 AM
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I too am a GM guy. Ive had several silverados. I try to stay between 2000 to 2005. I am patient and have bought them with low miles. That being said I never service transmissions and have had zero problems with transmissions on GMs. I have heard horror stories tho
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Old 03-26-2019, 09:26 AM
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This can work anecdotally for any model of vehicle. I've owned 3 Fords in my life; 2 cars and a truck, and all 3 needed their transmission rebuilt/rep;laced long before 100K miles. One of those was a manual transmission, and another one had TWO auto transmission before 100K miles.
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Old 03-30-2019, 03:51 AM
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First thanks for all the replies...definitely useful info. Quick update....GM told my dealer they would not participate in the replacement of my transmission because with 130K miles it is too far out of warranty. To the credit of my dealer they offered to replace it at cost no labor. $3,483 later I'm back on the road and there's no question the new transmission shifts differently than the original. Gears shift at higher RPM's and it feels tighter and smoother. That said, I very much respect the dealer involved but will not buy another 1500 series GM. Ironically I was just getting ready to purchase a High Country 2500 diesel from this dealer and still might but for now I'm having trouble getting past having to replace 2 transmissions in 2 separate GM 1500 trucks so I'm now giving a look and test driving Ford's F250 diesel.
Whatever the true cause of these transmission failures is I'm unwilling to gamble again and hope moving to the diesel gets me back to a vehicle that can go 200K highway miles without major mechanical failures.

Tight lines to all...Thx
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Old 03-30-2019, 05:22 AM
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Originally Posted by Fin-isher View Post
First thanks for all the replies...definitely useful info. Quick update....GM told my dealer they would not participate in the replacement of my transmission because with 130K miles it is too far out of warranty. To the credit of my dealer they offered to replace it at cost no labor. $3,483 later I'm back on the road and there's no question the new transmission shifts differently than the original. Gears shift at higher RPM's and it feels tighter and smoother. That said, I very much respect the dealer involved but will not buy another 1500 series GM. Ironically I was just getting ready to purchase a High Country 2500 diesel from this dealer and still might but for now I'm having trouble getting past having to replace 2 transmissions in 2 separate GM 1500 trucks so I'm now giving a look and test driving Ford's F250 diesel.
Whatever the true cause of these transmission failures is I'm unwilling to gamble again and hope moving to the diesel gets me back to a vehicle that can go 200K highway miles without major mechanical failures.

Tight lines to all...Thx
The 2500 GM diesel has a COMPLETELY different transmission in it. It's an Allison design meant for diesels.
The replacement of the 1500 transmission is unusual in that the 6L80 is a stout trans.
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Old 03-30-2019, 10:42 AM
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Not riding in as the GM cavalry or trying to start a debate; worked at Chevy dealer many years and basically always drove GM trucks. Have personally owned multiple 4L60E's go 300k+ with just normal services, but have seen many GM vehicles (various models, years, mileage, etc) in the shop for repairs and/or replacement. My point is, regardless of make, every dealership has transmission tech(s) in their shop. My F-I-L has always been a Dodge guy, buy a new about every 2-3 years, has had relatively good luck with the caveat that he has had a couple issues, including a replacement in one of his vehicles, think an '06 1500. Pretty sure every one knows someone with a Ford that has had issues too, gas or diesel, I know I do. Are there certain models that are way more prone to failure than other? You betcha! It's across the board though regardless of make. I always keep my rides a long time, currently working my K2500HD/6.0/6L90E with almost 170k, still shifting good.
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Old 04-01-2019, 01:53 AM
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OP,
the 2500 gasser has a 6 speed. We have had no issues with them.
The diesel has the Allison.
Bolth have nothing to do with the 1500 6 speed.
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Old 04-02-2019, 01:47 AM
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Thanks Jwb. Iím actually looking at a gas version 2500. The diesels are very expensive and donít lose much value so even buying one used is costly.
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