Medium Jolt on 1-2 Shift at high RPM. Am I overpowering tires?

[cole3498]

Hey all. My 2016 SHO has a pretty decent jolt on the 1-2 shift at high RPMs. I'm having a tough time determining if there is some sort of issue or if I am just overpowering the tires and the torque smoothing system is kicking in. Here is as much info as I have:

Car has 65,000 miles, trans fluid was changed by Ford at 59,000. I am currently running a gearhead AO tune (with the supporting sparkplugs and sensors) and Tony D trans mounts, no other powertrain mods. My tires are Cooper RS3-G1 (sportiest all-seasons I could find, stock size) with 7,500 miles on them, and suspension is stock (non-pp). The car has zero other symptoms or problems I am aware of. PTU/RDU fluids changed recently, all other shifts are smooth at high or low RPM, no CEL, no extra vibration or rattle (besides the NVH from the mounts).

I got a quick video of the shift today, ambient temp was 32 F. Car was warm, tires and road were not. This is what leads me to believe I may just be overpowering the tires, motor is happy in these conditions but grip is minimal. It's a bit hard to hear on video, but hopefully someone can let me know if that is about what our shifts are like.

I did notice one other similar thread posted recently, but that was an older car that had no mods and a few CEL/other issues. TIA to anyone who reads and lends their advice, hoping you can talk me off the ledge but you can never be too paranoid with this car.

 

[autoteleology]

Have you tried putting Shudder Fixx in the transmission fill port under the airbox? I had the exact same issue as you, to the point that my transmission would slip out of gear going from 1 to 2 under WOT, and it seems to have fixed it, at least for the time being.

Instant Shudder Fixx - Lubegard

www.lubegard.com

 

[cole3498]

Have you tried putting Shudder Fixx in the transmission fill port under the airbox? I had the exact same issue as you, to the point that my transmission would slip out of gear going from 1 to 2 under WOT, and it seems to have fixed it, at least for the time being.

Instant Shudder Fixx - Lubegard

www.lubegard.com

I was seeing lots on shudder fix but most people had other symptoms. Good to hear your issue was similar, I will keep it in mind! It dumped about 8 inches of snow here today so I won't get the chance to test any WOT anytime soon lol

 

[autoteleology]

I was seeing lots on shudder fix but most people had other symptoms. Good to hear your issue was similar, I will keep it in mind! It dumped about 8 inches of snow here today so I won't get the chance to test any WOT anytime soon lol

The other main symptom that I had was that my transmission would always hesitate for a moment to transfer power and start moving the car after I shifted into gear. I used to chalk it up to just being a quirk of an automatic transmission before the fluid heats up but it doesn't do that now so it turns out that's not actually normal behavior.

From what I've read, it's pretty much impossible to mess up your car by putting a tube or two in the fluid, and it costs $10, so if nothing else it's a great diagnostic tool to see if you have a fluid issue or a more serious transmission / torque converter problem.