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About Bigmac

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    2018 Sierra 6.2 Max Tow

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  1. What Weight Do You Tow?

    Before I got my 2018 6.2 max Tow I pulled a 6000lb trailer across the us for 3 months and 10,000 Miles with a 2015 5.3 6 speed Silverado. 3:42 Did great and ended up 10 mpg total. West coast to Maine - Down the east coast then back home to NW.
  2. Real world experience. I tow a 8000 lb 5th wheel. Using an Anderson Ultimate Hitch ( 42 lbs). I have towed all over nw and all thru west coast and spend time in Arizona in the winter and it works great. Never a problem and will get 10 mpg towing and I love it. Since 90% of the time it is used as a DD a 3/4 ton was not considered. I do have disc brakes on rv which makes all the difference but more of an afterthought then necessity but will never have another rv without them. It tows straight and have been in some severe windstorms but have never had a “ white knuckle” tow. Only added air bags to level but didn’t really need them. It works great for my application.
  3. Could you do the swap using a SLT grille instead of the Denali?
  4. My friend - you have a bigger pair then I do for attempting this. Good luck and watching. Liking the direction you are going.
  5. Good luck. Been there done that with my 17 8 speed. It’s inherit I believe with these trans and the converters they use. My understanding is 2019 8 speed has a different type of converter. My 2018 does it also so I just lowered my expectations of a fix from GM. Let me know what they figure out please. Try and tow a trailer and watch the shudder magnify to the 10th power 😀😀
  6. 2019 6.2 emblem

    Thank you 😀😀
  7. Any one working parts that would have the part # for the 2019 emblem? My local store has a blank look since I do not have a vin number. Thanks in advance.
  8. Hey Bigmac, I believe you when you said you have been all over the shudder issue. I am experiencing the same with a 2016 Yukon Denali with a 6.2. I bought it a month ago with 20,000 miles. I've had motor mounts replaced, but am definitely feeling the shudder under light acceleration as described in 16-NA-175. It seems like the most common dealership response it "Can not duplicate"


    1. Show previous comments  3 more
    2. Elew


      I made a visit to the dealership, they are very aware of the problem. I am told that there was some sort of update coming next month. I am also told that GM has bought back several

    3. Bigmac


      Let me know please how it works out. The 2019 8 speed have  a new and different converter possibly to address this issue. I would be surprised they continue to make updates for the 2014-2018 8 speeds.  As noted I love my truck and tows my rv very well except for tq chatter.  Stay in touch please with updates 😀😀

    4. Elew


      Maybe they will use that torque converter on the 2015 and 2016. I will let you know what they come up with. As it stands, the vibration and trembling is not acceptable for a 75+K SUV.

  9. Contact GM customer care to open a case. They will contact dealer and might offer some mediation. Definitely a problem you don’t hear about. If you have more than 1 GM vehicle in your fleet might be a good time to mention. Good luck.
  10. My type of shudder is In accelerating and will start in any gear especially with a load. Not to noticeable unless pulling a load. Same as last one so it’s “ normal” but not pleasant. It does not have the 45 mph rumble strip problem that many others exhibit. Drive up a hill and start applying throttle. It will shudder 1500 - 2000 rpms. Harder you acc the worse it will. Not real noticeable but like anything if you know it’s there you scratch it 😀😀. End of the world - no but if your an old car guy with a bit of OCD you want stuff perfect.
  11. I chased this shutter problem last year on my 2017 6.2 max tow till I was nuts. It will not go away and it got very bad when towing. It feels like t/q modulation. I changed fluid twice and installed a new t converter. Finally gave up as GM rep said normal. It did get better after driving 15k or so but will always be there. Had a chance to sell it ( long story) and buy a 2018 exact truck since the incentives where so good. Very little money difference $3k so made sense. I would have kept it as I got used to the chuggel as I call it. The 2018 does exactly the same thing but the trans shifting in the 2018 is night and day different. . Instead of shifting at a light load ( throttle) and banging into gear it will hold and shift smooth. I have read the tq has been changed in the 2019 and thinking the vibration issue might be one of the reasons. It is not bad except when towing and then it will shake very hard. Love the truck otherwise and that’s why I got another new one. I’m an ex tech and factory rep so I know the industry inside and out but lowered my expectations and live with its idiosyncrasies
  12. Just had my lower cushion cover replaced in 2 month old truck with a similar appearance. Go to dealer and they will order and replace. Piece of cake
  13. 8 Speed Transmission Recall?

    I have had A 2017 8 speed max tow and now a 2018 8 speed max tow same truck. Long story sold the 17 to family member. Replaced 2 converters and several flushes. They both exhibited the exact same vibration as you described. Not bad unless your towing something. Then it really is severe. It is from the torque converter pulsing is how I would describe it. Get used to it as it won’t go away I noticed the 2019+ 8 speed is using a different converter. Hope they rectify as it is a great truck otherwise. On a positive note - the erratic trans shifting clunks are gone. Much better shifts but time will tell.
  14. Mine is a bit heavier so no problems on your part. The main concern is hitch weight of the 5th wheel. I’m close but it handles it so good it is amazing. Pm me if you need more info like rv type and make etc.
  15. Had a 2017 MaxTow 6.2 SLT that towed a 5 th wheel around 3k last year to Arizona Ultra light 5 th wheel and tows it fantastic. Installed firestone airbags but didn’t need to. Great tow package and gets 25 mpg unloaded. Using an Anderson Ultimate hitch to help weight savings. Love it. Just got a 2018 exact same truck as I sold the old one for almost the price of the new one due to extreme rebates.

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