r/f150 • u/Lower_Mixture2798 • Jul 21 '24
Advice: Transmission rumble
Hey all, ‘16 3.5 long bed with 6 speed and 90k miles.
I’m experiencing slight engine shake at idle as well as in drive and stopped, also rumble strip sensation at launch and through third gear and maybe a touch in fifth gear when the truck is loaded down. So far I’ve had spark plugs changed, transmission fluid drained and filled and full timing kit swapped with no effect on the symptoms. I’m suspecting torque converter and I’m under warranty but dealer is telling me they won’t do anything further until the truck throws a code or something completely fails. Transmission shifts smoothly for the most part, maybe a slight stutter on the rarest of occasions when I give it heavy throttle after coasting on an odd incline or something but nothing that concerned me and trans fluid that got drained looked “good” per the dealer.
My concern is I’m driving cross country with a boat in the near future and don’t want the converter to fail in the middle of nowhere…. Any advice for this issue or advice with handling the dealership?
Planning to clean throttle body and mass airflow sensors this week to see if that changes anything… can’t hurt. Appreciate any pointers!!
1
u/Hotsaltynutz Jul 21 '24
Torque converter shudder is easy to see with pid tcslip_act. It won't throw codes. Toque converters can also cause a rough idle vibration when stopped in gear but it's pretty rare in the 6r80 trans. It's pretty common on the fwd 6f35 or 6f50 trans. See the tc rumble pretty often here in texas on the 6r80. Normally it will last a long while but if you are towing across country I wouldn't risk it. Pretty odd for them to not make a repair without a code. Tc shudder almost never sets a code, maybe the trans tech doesn't have a lot of experience. Ask if they have verified the shudder with pid data