Shift flare

Haven’t found much written on this so hopefully someone can tell me about it. My transmission flares on 4th gear when feathering the gas after starting the truck and only at certain rpm. It’s not a warm up thing because the fluid would already be warmed. Like if I drove it, turned it off for 20 minutes, then drove again it will flare on 4th gear. Fluid level is good, 8400 miles.

 

Could you elaborate on "flare?"

 

https://youtu.be/M8wDBMY-Vw8 This. Like it jumps a couple hundred rpm before dropping into gear. Almost like a slip

 

An update: I just disconnected the battery for 15 minutes then drove it and it didn’t do it. Interesting.

 

Mine does it every morning and every time I shut truck off for 20 or 30 mins. I think mine does it in 3rd though.

 

At least I’m not the only one I guess. Do you think it’s a transmission thing or computer???

 

Have you verified the trans is filled to spec?

 

There is a TSB about this T-SB-0077-16 R1 although there is a newer software calibration T-SB-0058-18, If the dealer hooks up the techstream, they should load up the latest calibration regardless of the tsb sited. Being that its a 2016, if the software was never updated, then its likey on the older revision.

 

My transmission was filled full. I have checked. I believe it is the transmission but I do not believe there is anything actually wrong. It does not flare if you really get into it but is only under slight throttle.

 

Running the latest software (as of January) and topped trans fluid. First drained fluid till trickle, then later checked it and drained to a drip as per service manual.