Help requested with MT-82D4

[chuckhammer]

Car is a 2022 GT 300A car with no options and the MT-82D4 transmission. Bought it new on December 29, 2022. It now has 8800 miles on the odometer.

Symptoms:
Hesitation and lockout when *downshifting* into 2nd gear. Initially, this never used to happen, then it became occasional, but it's now consistent. Even while stopped and idling it will be difficult to go straight from neutral into 2nd. If I go into 1st and then into 2nd, also while stopped and idling, no problem at all. Typically, I run into this when downshifting from 3rd into 2nd. Also, full throttle upshifts from 1st to 2nd above 4000-5000 rpm frequently show lockout. Basically, going into 2nd gear in any manner other than relaxed upshifts is a gamble. Very frustrating.

Based on these symptoms, I believe the 2nd gear synchros are bad. To my recollection, these worsening symptoms occurred after swapping to Motul Multi DCTF. Unless you all tell me it's a 100% waste of time and money, I plan to try BG Synchroshift II 75W-80 or even Red Mine MT-90 (75W-90) to see if that helps. I'm thinking the higher viscosity might help the synchros engage faster. Otherwise, it's time to open her up.

Clutch seems an unlikely culprit to me based on the above.

Open to other ideas and suggestions. Want to hear from the experienced hive mind here. I know at least a few of you have forgotten more about transmissions than I'll likely ever know.

Related modification history by mileage:
2503 mi
Installed Steeda Tri-Ax Street short throw shifter.
Installed Steeda shifter base bushing bracket.
4662 mi
Installed Steeda transmission mount bushing insert.
7388 mi
Changed transmission fluid with 2.7 quarts Motul Multi DCTF.

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[NGOT8R]

Unless you’re the exception to the rule, I don’t think a specific fluid change is going to straighten things out for Lou. It’s looking like you’re gonna need a better clutch to fix the issue.

I never had the opportunity to try out one of the Blowfish Racing brackets, but perhaps those that have can chime in and share info. on whether or not those would help the situation any.

 

[Jaymar]

Is it possible that all of your modifications to firm things up have make an already finnicky transmission more pronounced? Try backing the modifications out to see if that makes it better first. Particularly the bushings. My MT82D4 is much stiffer, especially going into 2nd, than any other trans I've ever had. Even my MT82D5 was smoother.

 

[NGOT8R]

Have you tried downshifting with rev match active to see if that helps with that?

 

[chuckhammer]

Have you tried downshifting with rev match active to see if that helps with that?

Yep, rev match has been on for a while since this issue first showed up. It helped but didn't fix it.

Since it's only an issue with 2nd gear, and even shows up idling while stopped, I don't think it's the clutch failing to disengage. Goes into all other gears without issue, even at WOT and 7500 rpm.

 

[chuckhammer]

Is it possible that all of your modifications to firm things up have make an already finnicky transmission more pronounced? Try backing the modifications out to see if that makes it better first. Particularly the bushings. My MT82D4 is much stiffer, especially going into 2nd, than any other trans I've ever had. Even my MT82D5 was smoother.

Could be. I don't recall exactly when this started. It was either when I installed the trans mount bushing insert or when I switched to Motul Multi DCTF. I don't see anyone else having issues with either, other than NVH with the insert. Everyone praises Motul Multi DCTF. I will say all my gears other than 2nd shift great. Much better than when fully stock.

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