Thanks. I did try the manual setting before. Just not sure if I kept it ninth gear. Gonna try this again.
slight engine resonance through steering wheel
- Thread starter TommyS
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Thanks. I did try the manual setting before. Just not sure if I kept it ninth gear. Gonna try this again.
tom3
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It should allow you to use all the gears up to ninth in automatic as usual but won't shift into the top gear. I wonder if these ten speeds ever actually use 10th anyway. My brother has a Jeep Cherokee with a 9 speed and it has to be running something like 80mph to go into ninth.
StephenPT
Full Access Member
I have a Banks iDash which shows the gear status. It’s not until ~62mph that I see it drop into 10th. Mind you this is on the diesel and it might have different shifting logic on the gas engines.
The diesel has enough torque that when we’re on a road trip going up and down I5 on the west coast I rarely see it down shift from 10th when cruise is set at ~70mph.
Handles the passes well, huh?
My issues is when the truck is revving in the 1500-1800 rpm range. Most of the time I feel the vibration probably in the middle gears, not the highest or lowest gears. I think shutting down the 8th or 10th gears wouldnt solve my issue. If I new a way to totally shut the dfm down, then i would know if that is the problem
StephenPT
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In your case I’m not suggesting to use L9 to lock out the higher gears, but because it’s been documented that in that setting DFM won’t activate. You’ll be running a V8 engine 100% of the time and if the cause of your vibration/resonance is DFM then you’ll know on the first drive with it set at L9.
StephenPT
Full Access Member
Post in thread 'Driving in L9 and DFM'
https://www.tahoeyukonforum.com/threads/driving-in-l9-and-dfm.131703/post-1643669
https://www.tahoeyukonforum.com/threads/driving-in-l9-and-dfm.131703/post-1643669
StephenPT
Full Access Member
Yep. Between PDX and OLY it never leaves 10th. When we head south and go through Grants Pass then I might see it drop to 9th or 8th during the steep grades. With peak torque at 1500rpm and over 80% at 1250rpm it really takes a lot of grade to force the engine to downshift.
Stephen, I appreciate the help. I’m gonna try L9. I had read the thread you sent me, but those guys have 2022’s or older. The 2023/24 models were refreshed models. Not sure if the manual setting will work on the DFM with my 2024. Absolutely going to try it though. Sucks that there is no dashboard signal showing when it switches down to 4 cyclinders. I know Range tech is just now introducing plug ins for the 2023 and newer models to block the DFM. Makes me think the software for the newer models are different.
If anyone has 2024 model year truck that can confirm L9 shuts down the dfm, please respond. Thank you.
