40 mph shudder?

[jasf]

2012 5.7 QC 4x4 12,500 mi. At a constant 40 mph the truck has a shudder/vibration/growl that can be felt through the floorboard. I noticed over the weekend that it also has this condition downshifting in stoplight to stoplight conditions. Any ideas before I take it to the dealer?

 

[Jerseymike]

Well if its not your MDS kicking in and out then, it sounds like a torque converter lock/unlock issue. You can check the trans fluid, if its ok then take it in they will most likely re-flash the TCM.

 

[Burla]

I get shudder when the rpms are too low, I solved it by driving in tow haul mode every time I start my truck. Low gears are usually so short the rpms wont fall because your transmsion will just chnage gear, but when I'm in those middle gears and I slow it happens. TH mode decreases the shifts to keep you in higher rpms.

 

[Razzaa]

2012 5.7 QC 4x4 12,500 mi. At a constant 40 mph the truck has a shudder/vibration/growl that can be felt through the floorboard. I noticed over the weekend that it also has this condition downshifting in stoplight to stoplight conditions. Any ideas before I take it to the dealer?

I solved both issues with a DiabloSport and custom tune.

 

[metalfab]

I solved both issues with a DiabloSport and custom tune.

Expensive solution.

I'd try the tow/haul mode first ;-)

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[Razzaa]

Expensive solution.

I'd try the tow/haul mode first ;-)

Sent from my Nexus 4 using Tapatalk

Expensive but really effective. Wasn't the only reason I got the tuner ofc

 

[metalfab]

Expensive but really effective. Wasn't the only reason I got the tuner ofc

I agree on the Diablo. Mine drones a bit as well, going to try the tow/haul button as well.

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[Adept]

I had this same issue. Really bad vibrations... They had my traction control module replaced. Afterwards the vibrations continued for a couple of weeks then it was gone. I don't know if this helps or not.

 

[jasf]

"drones" is a better term for it. I like that. I put it in T/H tonite on the same stretch of road & it's gone. But,why did it start? I've driven the truck down this same road for 14 months with no issue.

 

[Burla]

Dunno the cause other then the low RPM's, but I'm glad you solved it. So you can do like I do and always run TH or you can tune the bogging shift points out with a tuner and I believe it is white lightening custom tune. Does Moe's still sell the package tuner/tune? I believe there is no downside from driving in tow/haul, in fact i wished that is how Ram would have tuned my truck in the first place. You don't save gas while bogging that much in a gear, in fact you "might" be putting unburnt fuel in your oil. The stock shift points are an extreme situation that has no benefit.

 

[metalfab]

Confirmed with my 1500 last night when in Tow/Haul or +/- mode drones disappear entirely.

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[smiley]

Sounds a lot like the torque converter issue I had and if it is indeed that it feels like a shudder and does it around that that speed and most often up a hill or bridge.


$miley