LML Weird Accelerator Pedal shudder under load

diesel53

New member
Sep 16, 2010
907
0
0
AZ
Has anyone experienced a odd shudder that you can feel in the accelerator pedal under a load? Or is something likely rubbing on my firewall? I do have after market up pipes and downpipe so that was a possible cause to me or is my trans actually imploding beneath me at 550hp lol
 

$chultz38

Member
Jan 22, 2009
230
5
18
'11 or '12? Heater hose vibration, there is a service bulletin for this issue if that's what it is. Just have to rotate one of them up at the firewall.
 

FSUwelder1212

New member
Oct 18, 2012
92
0
0
My 2013 does it, I'm pretty sure my trans/torque converter is crapping out. Another thing to look at, If you have an aftermarket hot side pipe make sure it isn't rubbing the brake booster. I know my buddy had that issue on his 2015 w/ an HSP hot side pipe, my wherli pipe has more clearance so it's not my issue. I haven't had one of the new body trucks but have had 3 gmt900 body trucks (2 3/4 tons and a 1/2 ton) and every one of them would give some vibration in the pedals if driving over really bad terrain.
 

KyleC4

Tech
Dec 30, 2016
470
48
28
Bay Area
Don't know if this is any help but one time I faced this on a 2015 one of the differential pressure sensor pipes cracked in the exhaust system and the way it resonated and transferred to cab felt like in pedal.
 

NC-smokinlmm

<<<Future tuna killer
May 29, 2011
5,214
364
83
At Da Beach
Logg TC slip and lockup. I'd bet the lining is coming apart and its unbalanced. I'd also change the spin on filter and see how much crapp is on the magnet...
 

clrussell

pro-procrastinator
Sep 23, 2013
5,928
399
83
I'm in the same side as a converter issue too.. was just curious as if it was a 15.5 or newer since I've had one do that with a small tune.
 

diesel53

New member
Sep 16, 2010
907
0
0
AZ
Im leaning towards something on the firewall, ill check today and post back.

It does it even when im letting off the throttle, WOT I feel nothing. It always varies.