Jump to content

Who likes their 8 Speed?

JacobC1983
 Share

  

824 members have voted

You do not have permission to vote in this poll, or see the poll results. Please sign in or register to vote in this poll.

Recommended Posts

JacobC1983 Enthusiast

JacobC1983

Posted
  • Author
Posted

I know the yukon denali and escalades were gettings the 10 speeds; I didn't think the Sierra Denali was getting it until 2019 with the redesigned trucks

  • Replies 662
  • Created
  • Last Reply

Top Posters In This Topic

Popular Days

Top Posters In This Topic

Popular Days

Popular Posts

JacobC1983
JacobC1983

I care about warranty.... It pays for repairs that otherwise I would have to pay for out of pocket. Actually, lots of people care about warranty on a $50k+ vehicle.

mitchellb2005
mitchellb2005

I love my 8 speed. I never hate it, but sometimes it does small annoying things, but I expected an 8 speed to be a little finicky sometimes since I also have an 8 speed in my Audi A7. Once you learn w

Posted Images

wildlyfe200 Enthusiast

wildlyfe200

Posted
Posted

I know the yukon denali and escalades were gettings the 10 speeds; I didn't think the Sierra Denali was getting it until 2019 with the redesigned trucks

From my research no Sierra, Denali or not is not getting 10 speed in 2018 yukon yes.

 

Sent from my SM-G930T using Tapatalk

Snoringbear Enthusiast

Snoringbear

Posted
Posted

This is exactly what Mercedes does on the 7 speed in the S550. Pulls from a stop in second gear. Now if you put it in sport mode it starts in 1st gear. But all normal driving even very slow it doesnt drop to 1st unless you floor it. And it's smooth and always in the right gear, so GM could do it as it is just in the tuning. The just wont do it! Now I fear they are abandoning the 8 speed which I like for alot of other reasons, especially towing. The 2018 Denali is getting the 10 speed.

Interesting. I wonder if it would be possible for one of those tuner outfits to design a program to do the same thing for 2014 ~ 2018 GM eight speed tranny? I once the application is understood it probably would sell....

mookdoc6 Senior Enthusiast

mookdoc6

Posted
Posted (edited)

Interesting. I wonder if it would be possible for one of those tuner outfits to design a program to do the same thing for 2014 ~ 2018 GM eight speed tranny? I once the application is understood it probably would sell....

 

Yeah, could be of use.....The 10speeds will be skipping on the way up and down during it's shifting. That would be cool to be slamming from 1st to 3rd with 8K behind you than having that load slam and push you after the Tranny just Jerked ya! Can't wait...........

Edited by mookdoc6
JacobC1983 Enthusiast

JacobC1983

Posted
  • Author
Posted

Yea - they better get the programming in the 10 speeds right.

 

From what I have been reading over on the Ford forums.... they are already having some issues and failures with the 10 speeds.

seamus2154 Enthusiast

seamus2154

Posted
Posted

Yea - they better get the programming in the 10 speeds right.

 

From what I have been reading over on the Ford forums.... they are already having some issues and failures with the 10 speeds.

 

I was just in my dealership talking with three upper managers while buying my 2017 Denali, experssing I hope this 8 speed is improved. One said he was talking with a master tech who was on the line with GM regarding an 8 speed issue. He said they were improved quite a bit since their debut but still had complaints and issues although alot less. The GM guy on the phone said if they were having fun with the 8 speed, brace and get ready for the 10 speed because it should be a mess in its infancy due to many "new" designs internally. Never buy GM in the first 2 years of anything new is what I have learned.

  • Like 1
Dnt Senior Enthusiast

Dnt

Posted
Posted

Got an appointment with my local Buick GMC dealership to do my first oil change / rotate tires and "hopefully" FIX the clunky transmission on Monday (ECLIPSE DAY),

My Clunky 8spd Trans seems to be getting worse. When first started in the morning and putting into reverse it SLAMS into gear, at almost every slow roll coming to a stop it SLAMS into a lower gear really feels like someone hit the back bumper. It hunts for gears at low speed like it has no sense at all. Totally unacceptable. Makes me wish I had my 2016 6.2 8spd back. The 2016 only had a rare event of harsh downshift once in a while, this 2017 is Ridiculous. Will try to remember to report back. They will fix this or I will be driving a different truck in a few weeks. I am not going to put up with BS on a +64k sticker vehicle....

seamus2154 Enthusiast

seamus2154

Posted
Posted

There are TCM updates. They did one on my 2015 it was a big difference. Then I had the stator shaft done and they did another update which sucked and pretty much fixed my delayed engagement but it shifted like hell again. So I am certain this is all tuning. Either way I traded into a 2017 and so far I am very happy with the trans.........only 500 miles though!

cjhrph New Member

cjhrph

Posted
Posted

Happy here as well.

Not me. 2017 here. 6.2/8 Sp. Same issues. LOVE the truck and the 6.2, transmission is possessed at low speeds, turning, coming to a stop etc. Clunks, Harsh Downshifting, Surging. No problems when your on the gas though, impressive, smooth as silk. Just had TCM update from the PIP5437B bulletin applied at 600 miles. Not sure it did much. Ill give it short to while to "re-learn".

  • Like 1
Dirt-Rado Enthusiast

Dirt-Rado

Posted
Posted

17' 6.2L/8sp 7800 miles

It hasn't gotten any better but I wouldn't give up my 8 speed.

18MPG towing a 24' boat is unheard of in any other vehicle I've owned.

Clunks and surges but at speed it's great.

Curious how it'll do in the sand dunes off road.

I'm convinced once everyone cracks the codes to tune these things we should see an improvement.

  • Like 1
mookdoc6 Senior Enthusiast

mookdoc6

Posted
Posted

17' 6.2L/8sp 7800 miles

It hasn't gotten any better but I wouldn't give up my 8 speed.

18MPG towing a 24' boat is unheard of in any other vehicle I've owned.

Clunks and surges but at speed it's great.

Curious how it'll do in the sand dunes off road.

I'm convinced once everyone cracks the codes to tune these things we should see an improvement.

 

Needs more time....8speeds take forever to settle down.....Flush the Trans it will help immensely too!

Dirt-Rado Enthusiast

Dirt-Rado

Posted
Posted

Needs more time....8speeds take forever to settle down.....Flush the Trans it will help immensely too!

Good to know. Seems like when I drive it hard, it gets more aggressive and smoother. Still tough to break tires loose from a stop without brake standing. Others say it'll burn em up no prob but I drive fairly conservatively on a daily basis. What did you fill your trans with after the flush?
mookdoc6 Senior Enthusiast

mookdoc6

Posted
Posted

Good to know. Seems like when I drive it hard, it gets more aggressive and smoother. Still tough to break tires loose from a stop without brake standing. Others say it'll burn em up no prob but I drive fairly conservatively on a daily basis. What did you fill your trans with after the flush?

 

Yeah, the whole driving conservatively is why it's taking you and myself probably forever.....It almost seemed purposeful to me like hitting 10K better....20k...better..25K...wait it's really smooth now...35K and wake up drive and all that crap @ 5K is history? I did flush and fill it @ 18K with the AC-Delco HP @ a dealership and it helped hugely!

 

To me the thing is a absolute beast! IT loves being slammed? It never skips a beat and is smoother than anything floored up a decent grade? Than go down the other side and it holds speed and RPM's and goes down the hill like a STUD! Very Impressed with the downhill!

 

Try taking the battery off.....Let it sit couple hours hook it back up? Eventually, it will get better I have been where you are......

seamus2154 Enthusiast

seamus2154

Posted
Posted

17' 6.2L/8sp 7800 miles

It hasn't gotten any better but I wouldn't give up my 8 speed.

18MPG towing a 24' boat is unheard of in any other vehicle I've owned.

Clunks and surges but at speed it's great.

Curious how it'll do in the sand dunes off road.

I'm convinced once everyone cracks the codes to tune these things we should see an improvement.

 

Couldnt agree more. I just traded into the 2017 6.2/ 8 speed and can say this is much better than my identical 2015 setup. It isn't perfect but better. I agree in town driving, parking lots, and slow is where the issues are. Which is just tuning. Because off the light in a straight line it shifts perfect. Towing is where it really shines. Dropping to just 7th or 6th is so smooth and a pleasure towing. I have gotten 15 mpg towing at almost 80 mpg on flat roads here in Fla. Done even better at 70 mph. That is diesel towing mileage if not better. Don't know why but it is true the more you beat on it the better it shifts?

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing

  • Latest Articles

  • Posts

    • AidenVorpagel
      cam upgrade in CA

      By AidenVorpagel · Posted

      hello I recently bought a 2012 gmc 1500 with a 5.3 and have a AFM disabler on it I'm interested in doing a cam but I'm worried if I remove the AFM system I will fail smog does anyone have info if they are able to detect that or a work around to it (not talking about hot smogging) please let me know thank you  
    • B14Sierra
      Noise after AFM delete

      By B14Sierra · Posted

      Did you figure it out?
    • B14Sierra
      Possible lifter tick after DOD delete

      By B14Sierra · Posted

      Update. I started chasing down my symptoms. Started first with pulling valve covers and looked at everything. Everything looked good and couldn't hear or feel anything different. Then a compression test. 240 psi or really close on each cylinder. I was worried I was a tooth off of timing. Not bad for an engine with 173,000. Granted I did put new heads on. I sprayed water around the injector area to see if I could hear a change. Nothing. I hooked up my new hp tuner which I should have done in the first place but I don't really know what I'm looking at just yet but am learning. I noticed the fuel trims were way off so that told me I have to have either a bad injector or exhaust leak. New injectors, so I did the shop vac on blower and in the tail pipe. Sprayed soapy water and found the exhaust flange on the drivers side was leaking. I didn't think it would be that considereding I pulled the heads and left the manifolds attached. I did have the transmission replaced not long ago. They must have not seated them properly but I guess I didn't notice. I put in new gaskets on both sides. Which by the way isn't a bad job but I had a hard time getting them to seal right. Took two attempts. Reset the fuel trims and the ticking is gone, engine runs smooth and acceleration has improved. Got to feel the real difference with that stage 1 cam. It's not that big of a difference but it does add a little more. It feels like how the truck should have been from the factory.
    • Grumpy Bear
      Some Assembly is Required

      By Grumpy Bear · Posted

      Can it still be Assembled I?    Stribeck says that we need a certain amount of viscosity under conditions of load and velocity to prevent two surfaces of a know roughness from tearing each other asunder. And we have marketing trying to tell the masses that those two surfaced require less of that commodity due to more exact limits being placed on the same old clearances. We also know that there are limits to how hard something can before it becomes to brittle to be viable and to smooth to 'wet' the surface and that both of those conditions have been known and met since about the Second World War.    That viscosity value shook out at 10 centistokes at 212 F just under a hundred years ago.  Give this a look: [Anton Parr]     What is advertised is the Kinematic viscosity (mm2/s) or that which has been density adjusted but the value we are after is the dynamic viscosity (mPa.s) or true viscosity. You can see that this number is dependent on density thus base stock and temperature. You can also see that an SAE 30 doesn't reach that value in this example. However an SAE 30 that is at the upper end of the SAE 30 range; 12.5 cSt (mm2/s), might. 12.5 * .83 = 10.375 (mm2/s). If you could find an SAE 30 at the upper end these days.   Then there is the complication of viscosity modifiers or VII or VM, whatever you wish to call them. Polymers added to very thin base oils, perhaps 3 to 6 cP oils, that will meet the SAE *W30 spec at 'tested' shear rates and 100 C/212F  target temperature. So a polymer fortified base that is a fraction of the 10 cP requirement Stribeck insist upon.   This could be all well and good if those polymers didn't have two very problematic 'features'. They shear or loose viscosity both 1.) permanently and 2.) temporality. And they do both omitted in the advertised data with the distinct  purpose of deceiving the consumer of the actual operating state of the fluid. I've shown the example of Warren Oils COSTCO 10.91 cSt 5W30 formuation several times where the 100 C HTHS value is 6.9 cP!! That's the temporary shear down and with and SSI or shear stability index of 9.4 cSt. Note the intentional deception in using mixed units?    After a short while that 9.4 cSt oil has a viscosity corrected dynamic value of 7.8 cP. But as the SSI is still within the range of an SAE *W30 whose lower value is 9.3 cSt.    This allows them to continue to call this SAE 16 weight oil a 30 weight, the cake, and still meet the API requirements for fuel efficiency IMPROVEMENT mandated by the EPA. The eating of the cake. By the time you've worn out your motor doing the responsible thing by adhering to the warranty requirements, (the stick), you get deprived of the carrot, wear control. So sad, to bad.   So what can be done? Do I need actually say? [Anton Parr]       Even this must be monitored if the oil is on the low side and the VII an organic or you opt for a 0W40 with an even lighter base oil and more / higher MW VII. (Note the lower density of the 40 weight versus the SAE 30 mono-weight?)    There is another workaround. Temperature. An SAE *W30 run at a bulk temperature of between 180 and 195 F.    Being the belt and suspenders sort I am I do both. Run it cook and run it heavy.    In Part II I'll work the AW package. 
    • Atlas
      Wow I'm in a pickle. (Broke down truck) and a story.

      By Atlas · Posted

      So, do I go elbow-deep on this thing or list it for sale and play dumb? Seems to "runs good."   I'm about $1200 away from having: -a rebuilt injector ($300) -a new cat ($250) -a new cat back exhaust (OE style) ($300) -a new AC compressor ($200) -AC refrigerant charge ($150)   In theory, this should rectify the obvious detracting issues from its value and operability. Cold AC with a non-squeaking AC pulley both sounds and feels good. An exhaust that isn't cut/hacked in 17 different places and doesn't vibrate on a crossmember would make it sound and feel less janky. A working cat would help the stink, and will save the earth, but *if and only if* the fuel system is working properly, which would also address the intermittent "rich" CEL.   Heard a good one... CEL for "Rich condition" means you haven't spent enough money on the truck lately, and it's letting you know.   Rebuilding the injector would seem to be the most important part. Replacing the cat would be secondary. I don't think mine is plugged or overly restricted, but it might be a little restricted? I have no good way to tell other than seat of the pants feel. I hate the smell.   The current theory is I have a rich idle problem: A bad fuel pressure regulator, or a leaking injector(s) being the highest probabilities. I already replaced the FPR but that doesn't mean its replacement isn't also bad. It was a new part from Dorman, but the packaging looked like it had been sitting on a shelf for 20 years.   This is the (single) upstream O2 sensor shown at idle. I'm getting a lot of "rich" it seems. Sometimes it stays high like that and doesn't drop down. That makes me think it's processing injector leaks or a partially stuck open injector.     Other times it looks like this. Nice oscillations between rich and lean, which is what I think it should be. Under load and at speed, the oscillations are nice and tight and uniform looking, high and low.     Fuel trims suggest the PCM is compensating pretty hard at idle to pull fuel out. But it's not enough to trip a CEL. Something about slowing to a stop: brake vaccum booster, EGR, or the EVAP purge is delayed, or there's pooled fuel in the intake again that's draining into a cylinder is enough to set the CEL. Of course, in two days of driving, it hasn't set. I was hoping to actually look at the freeze-frame data when it sets. IAT is high because it's idling on an 83 degree day here.  

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...