Who likes their 8 Speed?

CounterMeasure · December 29, 2016

This morning, I took my truck in for the 35K oil change, and also had them change the tranny fluid out of habit and caution. A good number of miles pulling a trailer in hot weather, and I know the fluid never lasts as long as they claim. The sheet says they replaced the filter and put 6 quarts in it. I almost immediately noticed the truck drives entirely different now. Shifts are so much smoother, and no banging around. I took the long way home just to see, and it really is a different behavior. Still hunts the same, but hunts much smoother now. Didn't even have to disable grade breaking like I normally do. Before it was a nuisance doing low speed driving in the neighborhood, especially if cold.

Makes me wonder if they came out with a new fluid or filter, or if mine had the wrong fluid in it originally when they replaced the whole transmission 22 months ago. We shall see if the good behavior continues...

mookdoc6 · December 31, 2016

This morning, I took my truck in for the 35K oil change, and also had them change the tranny fluid out of habit and caution. A good number of miles pulling a trailer in hot weather, and I know the fluid never lasts as long as they claim. The sheet says they replaced the filter and put 6 quarts in it. I almost immediately noticed the truck drives entirely different now. Shifts are so much smoother, and no banging around. I took the long way home just to see, and it really is a different behavior. Still hunts the same, but hunts much smoother now. Didn't even have to disable grade breaking like I normally do. Before it was a nuisance doing low speed driving in the neighborhood, especially if cold.

Makes me wonder if they came out with a new fluid or filter, or if mine had the wrong fluid in it originally when they replaced the whole transmission 22 months ago. We shall see if the good behavior continues...

I know there was a TSB on that 6.2 8sp flush and refill. I have the 5.3 and I know what you mean about the neighborhood driving in the cold.........The 8l90 is supposed to come with special synthetic fluid to help the cold shifts? Yeah....right........Mine acts gay until it's 180 degrees showing.......arghhhhhhhhh

AUJeeper · January 2, 2017

Dropped my 2015 with 6.2 and 18,000 miles off today for torque converter shudder issue. Also RPM's flare when pulling a hill, but holding throttle steady. Feels like a fish bite misfire. Love the truck and usually love the transmission, but I have had concern about mine since the first week I owned it. Same complaints as many on here have noted. Hopefully the new roque converter going in fixes it

AUJeeper · January 5, 2017

To close out my earlier post- Picked up my truck today and it drives better than it ever has. Replaced the torque converter. I asked if the torque converter was an updated part from what it came from the factory with. The service writer was not sure so he called the parts department and they confirmed it is an updated part.

Invoice below in case it helps anyone

silver sled 16 · January 5, 2017

To close out my earlier post- Picked up my truck today and it drives better than it ever has. Replaced the torque converter. I asked if the torque converter was an updated part from what it came from the factory with. The service writer was not sure so he called the parts department and they confirmed it is an updated part.

Invoice below in case it helps anyone

glad to see they used 12 quarts of fluid. When they did mine they only used 3.

mookdoc6 · January 8, 2017

Problems is..........I just had mine flushed! 12qts were good on that I have p/n 19331925 and previous poster has p/n 19353429....? I had the dude show me the quarts because well I can't believe any of these places anymore and all it said was DEXRON-HP so I was satisfied...............

I have 5.3 and previous poster has 6.2 so I assume he is rocking the 8speed 8L90?

Edited January 8, 2017 by mookdoc6

CounterMeasure · January 8, 2017

Problems is..........I just had mine flushed! 12qts were good on that I have p/n 19331925 and previous poster has p/n 19353429....? I had the dude show me the quarts because well I can't believe any of these places anymore and all it said was DEXRON-HP so I was satisfied...............

I have 5.3 and previous poster has 6.2 so I assume he is rocking the 8speed 8L90?

I just checked my paper, and they used 6qts 19353429 (Mobil 1 Synthetic Low Viscosity ATF HP) when they did mine. And they charged me 20.18/qt!

I really wanted a flush, but they pulled the pan and changed the filter. I wasn't happy about that, but I had already been there 3 hours and was ready to go. Still drives much better than before. I will have to dig up the paperwork on when they changed the tranny 18 months ago to see what fluid they used.

Dug out the Tranny R&R paperwork, and the fluid related line items are listed as:

1 19300536 fluid

4 19300536 fluid

So its listed as only adding 5 quarts of an older part number, that is listed as Dexron HP ATF. I dunno...

Edited January 8, 2017 by CounterMeasure

AUJeeper · January 8, 2017

Correct. My 2015 has the 6.2 and the 8L90. The repair has made a huge difference. All of the erratic shifting I thought was ''Normal'' is now gone

mookdoc6 · January 9, 2017

Well now I am lost? I saw the quarts that he used physically put into my hand DEXRON-HP

The part number on my lnvoice is for what looks to be Dex-VI? I have no clue After what I went through to get the Tranny flushed I am surprised there is was not a six speed swapped into place on it............Drove it today and it's still 100% better! At least I know I am not the only one getting jacked around...HA HA! Good luck with the dealers boys!

mookdoc6 · January 9, 2017

Correct. My 2015 has the 6.2 and the 8L90. The repair has made a huge difference. All of the erratic shifting I thought was ''Normal'' is now gone

Exatly what I am screaming brother! Why they don't include the 5.3 is BEYOND ME! Best 200.00 spent!

Stingray427 · January 13, 2017

Glad I haven't voided my warranty, since it has to have a new torque converter due to the transmission shudder /vibration. Of course with 680 miles I haven't really had time to do much! Lol. So far I'm not impressed with the 8 speed. They seem to have a laundry list of problems. I do love my 6.2 though.

m3n00b · January 13, 2017

Glad I haven't voided my warranty, since it has to have a new torque converter due to the transmission shudder /vibration. Of course with 680 miles I haven't really had time to do much! Lol. So far I'm not impressed with the 8 speed. They seem to have a laundry list of problems. I do love my 6.2 though.

I'm starting to think this truck would be fun with a 6sp manual.

-tapa

Stingray427 · January 13, 2017

I agree on that, but that would definitely be hard on the rest of the parts! I'm kinda wishing I'd have bought a used one with the 6.2 and 6 speed auto. Then I could go ahead and have it tuned and lift it.

mookdoc6 · January 13, 2017

Well, I can say, I am still 100% better and satisfied with the complete tranny flush on 5.3L 8speed! The shifts are pretty damn good now......except the little tug I get in the morning backing out of driveway and putting into drive is still there. Not even close to what it was before but still there and hanging onto gear and letting go in s stiffer means. I have had no clunks in thousands, thousands of miles.

Not sure if these puppies are so tight but....I remember one guy posting it takes 10-20K for the looseness to set in on the 8speed. I think I am finally ready to pull the trigger on BLACKBEAR and hopefully be 100% satisfied with my EPA compliant gearbox! I am close to 20K

Tattooo · January 13, 2017

Had the 6 speed in my 14 and have the 8 in my 16 and love the 8 speed....way smoother and hasnt clunked once sunce learning mode....very happy with it