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

CRApex Enthusiast

CRApex

Posted
Posted

I didn't like mine at first...It has 3000 miles on it now (6.2 8spd) and now that it seems to have "learned" I'm actually really liking it.

  • 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

JacobC1983 Enthusiast

JacobC1983

Posted
  • Author
Posted

Jacob, Just got done driving about 20 miles in various conditions. No change from driving in M7 except worse MPG from the higher RPM's on the highway.

Thanks for the update. I figured as much.

JacobC1983 Enthusiast

JacobC1983

Posted
  • Author
Posted

The field service engineer was completely wrong... I disabled grade braking and drove around in manual 7 and the truck still has clunking shifts.

 

My service advisor is letting me know next week about the trade assistance and buyback options.

wetcoast Enthusiast

wetcoast

Posted
Posted

 

 

Hi Chris,

I am always happy to help. Thanks for reaching back out. I look forward to receiving your PM. In the meantime, if you have an additional questions please feel free to ask.

Have a great day.

Julianne M.

GM Customer Care

I have the truck back. Still clunky shifts as expected. The dealer put 3 new tires on the truck because 3 out of 4 tires were so out that they wouldn't balance. All of this with 5600km on the odometer. These factory tires are now proven to be very inconsistent.
mookdoc6 Senior Enthusiast

mookdoc6

Posted
Posted

the rims are probably pretty inconsistent too. goodyear tires are only good for going 90mph around a corner and wearing out in 35,000 if your lucky..........IMO been the biggest joke in tire industry for years! Get em wet and they are straight dangerous!

  • Like 1
seamus2154 Enthusiast

seamus2154

Posted
Posted

Anyone have P to D and/or P to R cold harsh/delay engagement??

 

This is a known issue for many guys mainly 2016 models. There is a TSB out on it in one of these transmission threads. Dealer should know about it. It involves changing some plate that now has a check ball so it doesn't leak down when left for long periods. Oh here it is I found it:

 

http://www.gm-trucks.com/forums/index.php?app=core&module=attach&section=attach&attach_rel_module=post&attach_id=61340

bosro Enthusiast

bosro

Posted
Posted

Jekyll and Hyde....

That's how I see my 8 speed.

Clunky....weird shifts some days.

Smooth and predictable others.

Sadly the Clunky weirdness is the majority of time.

Any hard acceleration seems OK but idling around town and coasting to stops usually gives a good clunk of some type.

V4 mode may have something to do with so I went and ordered the Range device to disable it.

No I did not want to tune it....I believe something will break eventually so I'm taking no chances with warranty.

Some of clunking sounds like coming from rear end.

I've resigned myself to driving it till it breaks....and I refuse to sit truck at dealership for days or weeks.

Either it breaks or I do....

bosro Enthusiast

bosro

Posted
Posted (edited)

Guess I'll just drive the shit out of it and see what happens

Edited by bosro
5829BMG Enthusiast

5829BMG

Posted
Posted

 

This is a known issue for many guys mainly 2016 models. There is a TSB out on it in one of these transmission threads. Dealer should know about it. It involves changing some plate that now has a check ball so it doesn't leak down when left for long periods. Oh here it is I found it:

 

http://www.gm-trucks.com/forums/index.php?app=core&module=attach&section=attach&attach_rel_module=post&attach_id=61340

 

Can some one post this TSB in its entirety

zert100 Enthusiast

zert100

Posted
Posted

That doesn't work for the 8 speed trucks, thanks though. I have tried it, and many others in the thread with 8 speeds haven't had luck with it.

 

doesn't work with the 6 speeds either...

tmw22 Enthusiast

tmw22

Posted
Posted

I've had my 2016 with 5.3 and 8 speed for about 3 wks now and almost 1000 miles, it has never acted funny at all. It always goes into gear immediately and haven't heard or felt the first clunk yet. So far I am loving this tranny and this truck, hope I didn't jinx with this post ?

scottp1108 Enthusiast

scottp1108

Posted
Posted

One week in, about 600 miles, all seems to be well with it. Had a couple times where I felt a little something while slowing then accelerating, but nothing to write home about. Hope it keeps up.

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

  • Recently Browsing   0 members

    • No registered users viewing this page.

  • Forum Statistics

    250.4k
    Total Topics
    2.7m
    Total Posts

  • Member Statistics

    342,759
    Total Members
    8,960
    Most Online
    DM22
    Newest Member
    DM22
    Joined

  • Who's Online   2 Members, 0 Anonymous, 2,964 Guests (See full list)

  • Latest Articles

  • Posts

    • B14Sierra
      Cam chain tensioner question

      By B14Sierra · Posted

      So I'm in the middle of a DOD AFM delete on my 6.2 L86 Sierra. I had a pick holding the tensioner but after I got the Cam phaser gear off I was cleaning off all the rtv and apparently I didn't have the pick seated far enough in. I bumped it and the tensioner sprang forward.  I think everything is good but I want a second opinion. The top of the tensioner is just a looped piece of plastic that rides in that channel right? There is no spring or anything is there? I got the gear and chain back on and it seems tight and everything looks right. I'm hoping nothing fell out.
    • dna9656
      No low range 4 x 4

      By dna9656 · Posted

      My 2015 1500 LTZ Silverado suddenly won't go into 4 x 4 low. It will go into 4 x 4 high.
    • asilverblazer
      Transmission Woes :-(

      By asilverblazer · Posted

      Yep, just a quick reference point.    My main point being I’d do a thousand other things before I’d pay 10k for a transmission.    Speaking in ignorance cause I don’t look at these trucks, what is it worth? 20k?
    • asilverblazer
      Intermittent no-code issues on 2022.5+ V8 trucks — what did the shop fail to capture?

      By asilverblazer · Posted

      I think users are going to want to pick their monitored parameters, which parameters they want to see first.    It should probably start with baseline at a minimum and adjust to learned, but be able to overlay baseline for comparison.   A simple severity level would be able to determine what type of alerting is appropriate or user selectable.    Why not use the OBD port though?   I think a phone connection would be a good idea, push notifications type deal.   Number 1 issue is having data is useless if you don’t know what the data should be under normal conditions. 
    • Chuck FB
      summer road trips in the 2026 2500HD

      By Chuck FB · Posted

      I thought I would use your thread and add to it as I just did my first longer drive with my truck in the last couple of days. I drove from the Grande Prairie area of Alberta down to Edmonton and most of where I drove in the city was the ring road so fairly free flowing but a bit of stop and go as well in the city. Stayed the night and returned home and not too many stops along the way each way but every restart and certainly every cold start sets it back for fuel mileage. Why I say that is I see some people will cherry pick a fuel mileage leg after the vehicle had been warmed up driveline wise before hand and its a forgiving ( easy rolling drive leg for example ) and call that their fuel mileage which can give a false perception of reality. I was not heavily loaded at all but never the less the flip bak cover, rubber bed mat, various tools etc and extra jerry cans of fuel all way up to a few hundred pounds of dead weight so its not an empty truck. The cold inflation tire pressures are set more near the freezing point so once they are warmed up driving I was showing 45 front and over 40 rear and realize high inflation pressures would help a little in fuel mileage but certainly not the ride on our crap sections of highway. The weather was good so was not raining as that can really drag mileage down, in fact I had a bit of a tail wind on average driving home. Most people on here would never have driven on that freeway to visualize it but its got a fair bit of rolling type of landscape with numerous river valleys. For the most part I had it on cruise set to 62 although kicking it off if I caught it in time before it started down shifting and self braking going down the grades. Most of the more substantial grades its shifting into 7th I believe as 8th just doesn't have it. Total distance round trip was 643 miles and my overall average and I did refuel three times in all, figured out to 17.65 miles per US gallon. My best fuel mileage section refuel within all of this figured out to 18.46 and these are all hand calculated figures. I find if anything that the trucks computer can be over optimistic, sometimes its pretty close but other times its stretching it. On paper persay in theory the truck would have just about made it on fumes for that whole drive without refueling once.    Which made me think of the topic thread of the wonder if these trucks could do 20 mpg and that is a good question, certainly would have to be on an easy going flat highway, no head wind, the right temperature, not packing around a bunch of dead weight and puttering along even slower than I was I would suspect and going steady and not stopping to smell the flowers or take a piss !. It probably is possible but not without effort to attain that with the wind resistance and weight of these trucks. Of course on my drive most people are passing me if they have the power as per loaded highway tractors, never mind a lot of speedy vehicles but the speed limit is 68 and most are at or well over that. 

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...