[1lunger]

DHD 100-501 Allison Line Pressure Modifier LML L5P 2011-2017 LCT1000

This will help the Allison by maintaining pressure on the clutches at all times. But it does raise trans temps about 30 degrees

If you’ve been running this for awhile, do you have any feed back?


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[Micheal Tomac]

Yes, but in the summer trans temps towing in stop and go or city driving can get over 200 degrees. About a month ago I installed a trans cooler thermostat bypass made by Linco diesel and trans temps are back to normal. https://lincodieselperformance.com/shop/ols/products/ldp-l5p-trans-cooler-bypass-valve

 

[1lunger]

Yes, but in the summer trans temps towing in stop and go or city driving can get over 200 degrees. About a month ago I installed a trans cooler thermostat bypass made by Linco diesel and trans temps are back to normal. LDP L5P TRANS COOLER BYPASS VALVE

He mentioned something about reinstalling OE for cold weather operation. I wonder how cold it would need to be to have to reinstall?


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[mostcorey95]

What would the cost be to up grade to the new 10 speed? That is once it’s out and available to the public.


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Well I know of two of the 10 speeds warping two sets of clutches so far and a replacement built to hold extra power is no where as do able as the 6 due to it being drums and not the same designs as before. They are machining drums and shafts to fit more. All the hard parts have both GM and Ford numbers stamped on them the biggest difference is fluid and clutch preload and shift strategy.
** RevMax is building a prototype transmission for someone I know that broke the ten speed with added power.

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[quantm1466]

Any update on this? Feeling like a bought a $50k used lemon.

 

[redwngr]

Well I know of two of the 10 speeds warping two sets of clutches so far and a replacement built to hold extra power is no where as do able as the 6 due to it being drums and not the same designs as before. They are machining drums and shafts to fit more. All the hard parts have both GM and Ford numbers stamped on them the biggest difference is fluid and clutch preload and shift strategy.
** RevMax is building a prototype transmission for someone I know that broke the ten speed with added power.

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Do the HD 10 speeds share parts with the LD 10 speeds?

 

[Tuff Stuff]

Well unfortunately I have the known “chuggling” issue on my 2019 L5P Duramax. The issue has occurred half a dozen times and the truck only has 1,800 miles on it. It always happens in 3rd or 4th gear under light acceleration. It feels like the engine loses fuel for a second causing deceleration, then gets fuel for a second and accelerates, the loses fuel again and repeats this half a dozen times before it goes back to normal slow acceleration. For all I know it could be transmission related vs motor related. No dash indicator lights come on when this occurs. Local Chevy dealer is no help. Dealer service personnel told me if no dash light indicator lights come, no code is thrown, and there is no service recall / bulletin on file (they checked and no 2019 service bulletins) ... then I should call the GM Customer Service 1-800 number and log a complaint. Did this today, they logged the complaint, gave me a case number, and told me a senior advisor would contact me in 2 to 3 business days. Should be interesting to see what they say. Will update this post after they contact me.

Do you also get the OnStar notifications? I get three of them. They are telling me it is a fuel injector and my does not go back to normal. I have to take it in. Just wondering if it is the same thing?
Thanks

 

[FreedomOne]

If you’ve been running this for awhile, do you have any feed back?


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I've been running an EPC fooler for a few thousand miles now with no problems. Im also running the Wcfab trans bypass plug so I don't notice any increase in temperature. Runs 70f over ambient all the time.

 

[sambor]

Just throwing this out there.
I also have a 2018 1500 HC 6.2L with the 8 speed and 31K. I have it in the dealer now to have a TSB done for the exact problem all of you are having with the chuggling at lite throttle. Mine will usually do It after it warms up and going up a slight hill. Shakes until you add or reduce power. The cure for mine at least is to flush and refill trans with a newer type fluid. GM says some of the trans in 2017/2018 models have a fluid that seems to like moisture and causes the problem.
We'll see when I get the truck back in a few days.
Maybe the same fluid is in ya'lls trans? Never heard of the problem when running the 295 fluid in the Allisons- does the new 10 speed use the 295 fluid?