Diablew Help Transmission??

[contenderv07]

I absolutely hate the way my 2018 shifts. it's got the 8-speed trans and it clunks when downshifting. I've taken it to the dealer 3 times now and they say "its within spec." I was looking to get diablew tuning to see if it could help with how the RPM ranges are, etc.. so the shift points aren't so brutal (I know the 8spd can't be tuned). So in saying that, did anyone that was having issues, get a tuner and it help out?? Just wanting to see before I get rid of it

[Jaychevy81]

There is nothing you can do with the 8 speeds trust me. They require a hardware mod and can’t be tuned. I have the hyper tec tuner. Was on the phone with them for over a hour seeing if there will ever be a tune for the 8 speeds. I’m not saying they never will be able to be tuned but it’s not like the 6 speeds.


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[Jaychevy81]

I tried the throttle response tune didn’t do much not sure if you can even do the RPM or anything more without the trans side. On the hyper tec 2000 you don’t have a lot of options on the 8 speed trans. I did reg fuel tune and throttle but nothing really diff with the shifting.


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[contenderv07]

32 minutes ago, Jaychevy81 said:

I tried the throttle response tune didn’t do much not sure if you can even do the RPM or anything more without the trans side. On the hyper tec 2000 you don’t have a lot of options on the 8 speed trans. I did reg fuel tune and throttle but nothing really diff with the shifting.


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ugh well thanks for letting me know. I was hoping that a custom tune might help out some but it's not looking good

[Jaychevy81]

ugh well thanks for letting me know. I was hoping that a custom tune might help out some but it's not looking good

Yea that’s what I was hoping for as well but no luck either.


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[Crobinson16]

Did you check with your dealership to see if there were any updates available for your trans. My 2018 6.2 had a update available for the ECU, and a improved shifting calbration update for the TCM. It's worth looking into. You can also check on

tis-2web. Enter your Vin and search away.

[contenderv07]

53 minutes ago, Crobinson16 said:

Did you check with your dealership to see if there were any updates available for your trans. My 2018 6.2 had a update available for the ECU, and a improved shifting calbration update for the TCM. It's worth looking into. You can also check on

tis-2web. Enter your Vin and search away.

I've been twice about the same thing, so Im hoping they checked it out. I'm on that site and can't tell what to look for haha

[SILVER SLED]

The 17-18 8speed trans can be tuned with the tcm in the vehicle, but not with a handheld tuner, as of now.  You’ll have to take it to a speed/tuning shop.  

[contenderv07]

so for the people that do have this issue and have the latest software on the trans, are they just dealing with it? I'm trying to decide if I can deal with it or just need to go ahead and trade it in

[Waterfowler41]

Before doing any tuning on my 6 speed I would manually turn off grade braking by holding the tow/haul button for 5-6 seconds. Not sure if you can do this on your 8 speed but it was a noticeable improvement. Doesn’t beat a tune but it certain a nice no-cost immediate solution.


Waterfowler 41’s Youtube channel: https://www.youtube.com/user/brittmork

[Jaychevy81]

so for the people that do have this issue and have the latest software on the trans, are they just dealing with it? I'm trying to decide if I can deal with it or just need to go ahead and trade it in

I am just dealing with it I love the truck so I figured if I trade it maybe the next truck whatever make may not have trans issues but other issues.


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[contenderv07]

Waterfowler41 thank you for that. I was wanting to turn that off, so maybe that will help diagnose it. 

 

Jaychevy81 I'm trying to figure out if I want to get something else (looking at a RAM), or sell it, get a more economical car, and a beater truck. I drive this back and forth to work (about 50 miles a day), so I'm still trying to see what I want to do