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New Transmission @ 3600 Miles

Txnolebd

By Txnolebd
in Troubleshooting & Recalls

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Txnolebd Enthusiast

Txnolebd

Posted
  • Author
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I think a lot of people just drive their vehicles until a check engine light comes on or it strands them on the side of the road. I have been in other vehicles with the 8 speed that made the sound that they weren't even aware of until I pointed it out.

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Front Runner Enthusiast

Front Runner

Posted
Posted

What dont you like about the 8 speed ?

 

 

No you wouldn't. My 6-speed shifted like crap. My 8-speed is 1000x smoother.

 

It's not that I dislike the 8 speed; I'm not having problems with mine. Overall, its a good tranny but I personally feel it has too many gears. It shifts a lot and sometimes seems confused about which gear it should be in. Again, there aren't any problems, but IMO a 6 speed is more than enough gears in 1/2 ton trucks. The rental 15 Silverado 5.3 that I drove for a couple of days had a 6 speed tranny and I thought it was good. Overall less shifting and equally as smooth as my 8 speed.

Tattooo Senior Enthusiast

Tattooo

Posted
Posted

 

 

 

It's not that I dislike the 8 speed; I'm not having problems with mine. Overall, its a good tranny but I personally feel it has too many gears. It shifts a lot and sometimes seems confused about which gear it should be in. Again, there aren't any problems, but IMO a 6 speed is more than enough gears in 1/2 ton trucks. The rental 15 Silverado 5.3 that I drove for a couple of days had a 6 speed tranny and I thought it was good. Overall less shifting and equally as smooth as my 8 speed.

Gotcha

 

 

 

It's not that I dislike the 8 speed; I'm not having problems with mine. Overall, its a good tranny but I personally feel it has too many gears. It shifts a lot and sometimes seems confused about which gear it should be in. Again, there aren't any problems, but IMO a 6 speed is more than enough gears in 1/2 ton trucks. The rental 15 Silverado 5.3 that I drove for a couple of days had a 6 speed tranny and I thought it was good. Overall less shifting and equally as smooth as my 8 speed.

Gotcha
Rme2513 Enthusiast

Rme2513

Posted
Posted

I bought my truck in November of 14 and it started the click sound while taking off they replaced mine and have not heard it since with now I have 17k miles on it 13k with the new transmission

txmuder Enthusiast

txmuder

Posted
Posted

After reading this post I feel fortunate that I have yet to have any issues with my 15' as of yet. I have from right off the get go made mods to mine that soot my driving habits and at no point do I blame GM for my having to add the mods as I new from the start what I was buying and also what I was going to have to do to the truck to meet my driving desires.

 

Also I owned (2) 11' and 12' Silverado's prior to this one and both had the 6 speed of course which I basically had no problems with but after owning and driving my 15' with the 8 speed (9700 miles so far) I have noticed a remarkable improvement IMO over the 6 speed. I do notice the clunking noise now and then but its nothing that I cant live with and if the tranny does go out then that's what a warranty is for, right. My 2012's went out at 87000 miles and GM rebuilt it 100% and no problems after that and the work was done in 2 days with a free rental given.

 

But things can happen and I wish the best to those having issues and hope all gets settled peacefully.

 

Jim

Txnolebd Enthusiast

Txnolebd

Posted
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Just to update thread I did get my truck back with the replaced transmission about a week and a half ago. Truck was no longer making the clicking sound which was good but was now doing some different things I hadn't experienced before like getting the bump like being rear ended when coming to a stop and some other clunks I had never felt in the previous time owning th truck. Overall the truck has been great but this 8 speed just seems like I have taken a step back. Combine that with GM's conservative transmission tuning it's just not enjoyable to drive and I'm not risking warranty on a tune with this transmission. Anyway I have cut my losses and moved on from this truck. Good luck to everybody else having issues with this transmission.

HondaHawkGT Senior Enthusiast

HondaHawkGT

Posted
Posted

Just to update thread I did get my truck back with the replaced transmission about a week and a half ago. Truck was no longer making the clicking sound which was good but was now doing some different things I hadn't experienced before like getting the bump like being rear ended when coming to a stop and some other clunks I had never felt in the previous time owning th truck. Overall the truck has been great but this 8 speed just seems like I have taken a step back. Combine that with GM's conservative transmission tuning it's just not enjoyable to drive and I'm not risking warranty on a tune with this transmission. Anyway I have cut my losses and moved on from this truck. Good luck to everybody else having issues with this transmission.

 

Your transmission is doing that because it's new. The computer module that controls the transmission has to 'learn' your driving style and how the solenoids respond to commands.My 6-speed used to 'bang' pretty hard on downshifts and get confused easily. After 1500 miles my trans almost never clunked. Give it time.

Txnolebd Enthusiast

Txnolebd

Posted
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I'm not going to get into all the specific details about this but this is really a gm thing and more so with transmissions in their trucks and larger SUVs. After having driven 6 speeds in trucks from other manufacturers for years I never had to deal with the frustrations I have with gm vehicles. Again, those trucks were not perfect but the drive train was way smoother. It might be in the programming and it might be hardware related. I don't know and it wasn't worth it to me to keep it and find out.

HondaHawkGT Senior Enthusiast

HondaHawkGT

Posted
Posted

I'm not going to get into all the specific details about this but this is really a gm thing and more so with transmissions in their trucks and larger SUVs. After having driven 6 speeds in trucks from other manufacturers for years I never had to deal with the frustrations I have with gm vehicles. Again, those trucks were not perfect but the drive train was way smoother. It might be in the programming and it might be hardware related. I don't know and it wasn't worth it to me to keep it and find out.

 

Such as Ford's 6R80 6-speed? It's the twin of the 6L80. Both get the same complaints for harsh downshifts and adaptive shift quirks. The Ram 6-speed was a glorified 5-speed with horrible gear ratios and sketchy reliability. Toyota has a decent 6-speed supplied by Aisin but then you're stuck with a decent engine/trans with a shitty truck wrapped around it.

 

Your transmission is literally brand new. It hasn't even had time for the adaptive shift control to learn your driving style. And if your driving style alternates between aggressive and granny, that process takes even longer.

Txnolebd Enthusiast

Txnolebd

Posted
  • Author
Posted

Such as Ford's 6R80 6-speed? It's the twin of the 6L80. Both get the same complaints for harsh downshifts and adaptive shift quirks. The Ram 6-speed was a glorified 5-speed with horrible gear ratios and sketchy reliability. Toyota has a decent 6-speed supplied by Aisin but then you're stuck with a decent engine/trans with a shitty truck wrapped around it.

 

Your transmission is literally brand new. It hasn't even had time for the adaptive shift control to learn your driving style. And if your driving style alternates between aggressive and granny, that process takes even longer.

Not taking the bait. I make my decisions based on my own personal experiences. I'm not here to down the Sierra. Overall I said it was a really good truck. I'm sure in time gm will get the issues with the 8 speed figured out.

HondaHawkGT Senior Enthusiast

HondaHawkGT

Posted
Posted

Haha bait? Everything I stated is factual. 100%.

 

Let your transmission break in before you judge it. The 8-speed is a similar design to the 6-speed, quirks and all. The learning process in the control module is part of that.

andyhaug Enthusiast

andyhaug

Posted
Posted

Why does it need to "break in"? I feel like I am being punished for purchasing a new vehicle! The 2000 I had before this never had to have the transmission broken in, it just shifted from day 1. I am now at 7200 miles, 1000 on my second 6L80, and while it upshifts ok now, it still doesn't have a clue how to downshift. With a request of more throttle it will either do nothing or downshift then downshift again. Either way it is very slow in doing so. All this to get the same 14 mpg in town. So much for this crappy shifting to improve gas mileage.

Badass69 Senior Enthusiast

Badass69

Posted
Posted

You don't. ... my 8 speed shifts nice from day one. When I had the thermistor for temp and it's harness swapped they reset the tcm of course. It shifted a bit off for the first 200 miles maybe... which is no different than if I reset the adaptives in my 05 Sierra's 4L80e.... then shifted good again. I have come to the conclusion I own an anomaly though. .. lol.

 

Sent from a potato

batman900 Enthusiast

batman900

Posted
Posted

The "break in" does seem a bit silly, though I understand almost all new autos need to "learn" which usually happens in around 100 miles with most vehicles. I also have to agree that 8 gears is overkill, that said, my 6 speed is still just as confused as I hear the 8 is. I will either end up getting a tune or trading depending on how the truck treats me in it's first year of ownership. Like OP, I don't deal with problematic vehicles, I get rid of them, just like the 15 WRX I loved but ended up owning for all of 2 months.

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