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trade 2018 Silverado w/ 6 speed to newer 8 or 10 speed?

luigi9801
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luigi9801 New Member

luigi9801

Posted
Posted

Just bought a 2018 Silverado LTZ with 36K miles. Just pondering if I trade-in and get a newer model that has either an 8 or 10 speed transmission. Are there any benefits? I felt comfortable with 6 speed since it has a more proven record but just asking for those with more experience

Yotaman Enthusiast

Yotaman

Posted
Posted

So you just bought it and want to know if you should trade it for a higher gear transmission ? Ummm Why did you not just buy a 8 or 10 speed to start with ? But yes go ahead and trade in.....

 

 

Yotaman

Enough Enthusiast

Enough

Posted
Posted (edited)

At least now you have a dipstick that you can check transmission fluid levels with without crawling up under the truck. 2020 and up no dipstick.

 

2018 and prior have belt tensioners making it easy to change belts. The belt on my 2020 has to be forced on and off with a "special" plastic tool, no tensioner.

 

2018 and earlier have loads of tune options, later models not so much.

 

DFM vs AFM. I have no clue how many cylinders are actually firing at a given moment with the 2020. In the 2018 it was obvious.  My 2020 won't idle smoothly even with auto stop off. My 2018 was smooth as silk at 500 RPM idle.

 

No issues with my 2018 6 speed. No issues with my 2020 8 speed yet.

 

Why don't I still have the 2018 ? After the electronics took a dump for the third time and the truck had to be towed out of my driveway again it was time for a change.

 

The "extra" money you get for a trade right now will be burned up by the full MSRP price the few new trucks available are being sold for.

 

Think hard before you make up your mind.

Edited by Enough
  • Like 1
  • Thanks 2
Josh Nelson Enthusiast

Josh Nelson

Posted
Posted
3 hours ago, luigi9801 said:

Just bought a 2018 Silverado LTZ with 36K miles. Just pondering if I trade-in and get a newer model that has either an 8 or 10 speed transmission. Are there any benefits? I felt comfortable with 6 speed since it has a more proven record but just asking for those with more experience

Don't get a '21. Having backup camera issues, shock issues, etc. Stay away. 

  • 3 months later...
3on8 New Member

3on8

Posted
Posted
On 6/11/2021 at 3:29 PM, Enough said:

At least now you have a dipstick that you can check transmission fluid levels with without crawling up under the truck. 2020 and up no dipstick.

 

2018 and prior have belt tensioners making it easy to change belts. The belt on my 2020 has to be forced on and off with a "special" plastic tool, no tensioner.

 

2018 and earlier have loads of tune options, later models not so much.

 

DFM vs AFM. I have no clue how many cylinders are actually firing at a given moment with the 2020. In the 2018 it was obvious.  My 2020 won't idle smoothly even with auto stop off. My 2018 was smooth as silk at 500 RPM idle.

 

No issues with my 2018 6 speed. No issues with my 2020 8 speed yet.

 

Why don't I still have the 2018 ? After the electronics took a dump for the third time and the truck had to be towed out of my driveway again it was time for a change.

 

The "extra" money you get for a trade right now will be burned up by the full MSRP price the few new trucks available are being sold for.

 

Think hard before you make up your mind.

A wonderful, fact-based post that helped me decide.  Thank you.  

  • Like 3
Enough Enthusiast

Enough

Posted
Posted (edited)
4 hours ago, 3on8 said:

A wonderful, fact-based post that helped me decide.  Thank you.  

Now at close to 20,000 miles on the 2020 a few more tidbits.

 

8 speed trans still doing great. I am amazed at the small rpm range this engine is designed to run in for fuel efficiency. Under normal acceleration I don't feel the shifts at all and even under hard acceleration the shifts are smooth.

 

If I remember to turn the auto stop off right after starting the truck it will idle fairly smoothly in that run cycle. If I forget and let the auto stop activate the truck will not idle smoothly during that run cycle even after turning the auto stop off.

 

Say what you want about the 8 speed's extra gearing making up for the 3.23 rear over the 6 speed with a 3.42 rear. My butt and the pull off of the line tell me different. I wish the 2020 had a 3.42 rear.

 

Still can't get the driver's seat "just right" on the 2020. The 2018 dialed in easily even after my wife drove it and changed all of my settings and was to most comfortable seat my butt has ever enjoyed in a truck.

 

I can't stand the electric parking brake. Unless I follow a specific procedure when releasing it and getting the truck moving from a stop there is a large jolt like the truck has been rear ended when I put the truck in drive. Start the truck. Foot on the brake. Release the parking brake. Shifter to reverse for a bit. Shifter to neutral for a bit. Then to drive. Otherwise I get hammered ! Does not matter level or inclined surfaces.

 

Jury is still out on the electric assist steering. Sometimes it feels quirky.

 

Missing the full center console I swapped in to the 2018 with Phil Gamboa's herness. If you can find a console for a 2020 they want close to 2 grand for it after shipping so that will have to wait. I had less than $600. 00 in the 2018 swap including the harness.

 

I like the power fold, turn signals, and paddle lamps on the 2018 and those options are not available to swap in on the 2020.

 

I've run 24 MPG over 400 miles average in the 2020 for weeks at a time and hit a couple of 25 MPG weeks in a row under the right conditions. 38 PSI in the tires yielded that but firm up the ride a bit. 34 PSI drops 1.5 -2 MPG. For a 4 door brick with an open bed that's not too shabby either way. The 2018 was within 1 MPG of the 2020, even with me enjoying the 3.42 rear from time to time.

 

I like my 2020, but in a perfect world if I could go back to my 2018 without electrical issues I would trade back for it in a heartbeat.

Edited by Enough
  • 4 weeks later...
3on8 New Member

3on8

Posted
Posted
On 10/8/2021 at 8:58 PM, Enough said:

Now at close to 20,000 miles on the 2020 a few more tidbits.

 

8 speed trans still doing great. I am amazed at the small rpm range this engine is designed to run in for fuel efficiency. Under normal acceleration I don't feel the shifts at all and even under hard acceleration the shifts are smooth.

 

If I remember to turn the auto stop off right after starting the truck it will idle fairly smoothly in that run cycle. If I forget and let the auto stop activate the truck will not idle smoothly during that run cycle even after turning the auto stop off.

 

Say what you want about the 8 speed's extra gearing making up for the 3.23 rear over the 6 speed with a 3.42 rear. My butt and the pull off of the line tell me different. I wish the 2020 had a 3.42 rear.

 

Still can't get the driver's seat "just right" on the 2020. The 2018 dialed in easily even after my wife drove it and changed all of my settings and was to most comfortable seat my butt has ever enjoyed in a truck.

 

I can't stand the electric parking brake. Unless I follow a specific procedure when releasing it and getting the truck moving from a stop there is a large jolt like the truck has been rear ended when I put the truck in drive. Start the truck. Foot on the brake. Release the parking brake. Shifter to reverse for a bit. Shifter to neutral for a bit. Then to drive. Otherwise I get hammered ! Does not matter level or inclined surfaces.

 

Jury is still out on the electric assist steering. Sometimes it feels quirky.

 

Missing the full center console I swapped in to the 2018 with Phil Gamboa's herness. If you can find a console for a 2020 they want close to 2 grand for it after shipping so that will have to wait. I had less than $600. 00 in the 2018 swap including the harness.

 

I like the power fold, turn signals, and paddle lamps on the 2018 and those options are not available to swap in on the 2020.

 

I've run 24 MPG over 400 miles average in the 2020 for weeks at a time and hit a couple of 25 MPG weeks in a row under the right conditions. 38 PSI in the tires yielded that but firm up the ride a bit. 34 PSI drops 1.5 -2 MPG. For a 4 door brick with an open bed that's not too shabby either way. The 2018 was within 1 MPG of the 2020, even with me enjoying the 3.42 rear from time to time.

 

I like my 2020, but in a perfect world if I could go back to my 2018 without electrical issues I would trade back for it in a heartbeat.

 

Thank you very much, Enough.  

start2finish New Member

start2finish

Posted
Posted

I had a 2018 with 8 speed and was very unhappy with the transmission.  It always worked, but was sometimes violent when shifting into gear from park.  Even with letting the truck warm up.  They did a fluid swap at 25,000 miles and it made it hunt around less resuming throttle from 5-10pmh turns when accelerating.  I may have had a lemon, but my issues seem to have been common for 2018 8 speed (5.3 engine)

 

 

pokismoki Senior Enthusiast

pokismoki

Posted
Posted (edited)

I would stick with the 6 or 8 speed,  the 10 speed is very new , heavy as S*** and robs power with the shear rotational mass.  from what I hear the 8 speed is the best option, but in terms of repairs, tuning, and parts , the 6 speed is where its at.

 

8 speeds need tuning to function correctly, and that requires tcm unlocking, which is $$$$$$

pre 2017 6 speed trucks are free to tune.

Edited by pokismoki
Transient Senior Enthusiast

Transient

Posted
Posted

2018 LTZ has a 6-speed?  My neighbor has a 2018 GMC Sierra that's not a Denali and has the 8-speed.  OP, are you sure your info is correct?

 

I have a truck with the 10-speed.  I use the parking brake daily.  My driveway has a 8% slope, according to the DIC.  I use the parking brake to prevent tension on my trans.  It doesn't matter the car or transmission, I'd do this anyways.  I have no issues with the parking brake.  I've noticed that if I forget to release the brake (likely because my kids are driving me crazy) that the brake releases on its own automatically.  No issues, tension, pressure, etc.  And, if I forget to set the brake while in my driveway and turn the truck off the brake sets automatically.  I also have no issues shifting straight from P to D.  No cycling through the gears. 

 

I also have no issues with the auto start/stop.  I leave it turned on.  No funny business going on here with my truck.  I have 20,8xx miles on the odometer right now. 

 

Maybe I'm one of the lucky ones.  Somehow I haven't had to deal with valve springs, leaky rear window, nor any other issues with my truck. 

 

As for a previous comment complaining about not having puddle lamps, certain seat features, power folding mirrors, etc.  It sounds like they didn't get a truck with these features.  All are available, and GM's seat functions really haven't changed in about 30 years.  Same switches, buttons, or levers with the same functions as always.  GM just makes you pay to play.

 

I am a little disappointed in the stretch belt GM chose to go with.  I was just looking at it the other day and noticed mine is rubbing up against something on one side.  The signs of wear are showing on that edge.  I'm going to have the dealer take a look next oil change.  I need to buy a spare belt anyways just in case one breaks while I'm on the road in the middle of nowhere.  I'll stick it with the spare wipers under the rear seat.

nolimits76 Enthusiast

nolimits76

Posted
Posted (edited)

I have a 21 AT4 with the 6.2 and 10-speed. No issues with my seat adjusting to a comfortable level or any issues with the parking brake.  No other issues at this point either but it’s < 2 months old. 
 

My last 2 vehicles before this was a 2010 Dodge Challenger RT with 6-speed manual and 2014 Ram with auto 8-speed (and 3.92’s).  Both with the 5.7 Hemi variant. 
 

I mention these for a few reasons. First, anything with cylinder management is a complication that continues to hinder IMO. Tuners adapt for the people that want to push the envelope but you are better off without it. Secondly, my Ram was a *dream* to drive. I initially had doubts with the 8-speed but in reality it was a Mercedes unit and coupled with the 3.92’s and 5.7 was a powerhouse!  The only thing I couldn’t outrun was a gas station, lol. Average driving was about 13mpg with towing dropping it to the 9mpg range. 
 

Moving to the GM platform this go round, I found it annoying I couldn’t get 3.73’s. But I love the 6.2. I drove the 5.3 and it didn’t have enough power for me. I may eventually change gearing but for now I’m good. I am glad it isn’t a 6-speed transmission as I don’t think I would have bought as it’s very noticeable to me now. FYI, I do mostly city driving but did manage to make a 4 hour trip recently and pulled about 24mpg and I was pushing 80+ most the way. I was pretty shocked to see the MPG that good honestly. 
 

Your question not only comes with potential preference and performance differences but also cost implications. Maybe in crazy COVID pricing you can sell your freshly purchased 2018 and move up without losing money but that is atypical. If you can do so then I probably would and jump to the 6.2 as well, assuming it still fits your budget. If it stretches your budget too tight or you lose money swapping I would be patient and consider other alternatives. There is always newer, faster and better just around the corner. Just ask all the guys holding out for the 2022’s, lol. 

Edited by 1AT4

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