Hard shift 1 to 2. Unless It thinks it's 70° or below.

[Hurst]

Hello all. I have a 12 rfe. It shifts 1_2 delayed and extremely hard, unless I modify HP tuners fluid temp interpretation parameter, to make it think its 70°or below. At that point it shifts like brand new. I'll drive around 5 miles at that point it reverts to 165f. Then shifts extremely hard on 1_2 shift. I replaced the pcm, line pressure sensor, input and output speed sensors. No change. Has anyone heard of such a strange thing? I have a valve body to swap out waiting on new solinoid block. Is this transmission toast? Am I wasting time and money dropping the pan? Thanks in advance.

 

[06 Dodge]

I have never heard of or read of a {12 rfe.} transmission...

 

[Hurst]

I have never heard of or read of a {12 rfe.} transmission...

2012 year of manufacture..

 

[p-Bar]

Probably a 68rfe

 

[AH64ID]

Sounds more like a tuning issue than a trans issue.

 

[p-Bar]

Not throwing any codes?

 

[Hurst]

Probably a 68rfe

Yes 68rfe

 

[Hurst]

Sounds more like a tuning issue than a trans issue.

I had the dealership flash a stock calibration because I thought the same. Still doing it.

 

[Hurst]

Not throwing any codes?

No codes. I see a pressure spike during the shift to 170 at light throttle. Ran like a beast this morning till it passed 70°.