TRNW-2: 850RE, 1-2 issue

[Healy Powertrain]

It could be the TCM on top of the VB acting up. Pretty much impossible to diagnose
and not available seperately..pfff


On Wednesday, February 26, 2025 at 10:28:31 pm +01:00, Pat Schulte via trnw2 <trnw2 at trnw.net> wrote:

> Date: Wed Feb 26 13:28:31 PST 2025
> Subject: 850RE, 1-2 issue
> 
> 850RE out of a Dodge, actually 2 of them that I built that seem to have the same issue, but since I only have one of the vehicles here, I will discuss that one. The vehicle will attempt to make a 1-2 shift, it feels like it may change ratios for a split second then will command back to first and set a 1st gear ratio code, after that no further gear changes. The only things that happen on a 1-2 shift is the C clutch comes off and the E clutch applies. This unit has new C and E drums, they are correct size, proper clearance, they will aircheck tight through the shaft and when assembled, aircheck through the case. A scanner movie shows the C solenoid coming off and the E solenoid coming on at the proper time. I have confirmed by my own pics from last year and also from ATRA pic, the VB is correct. It has the white and orange solenoids which I cannot test, but I swapped solenoid positions which changed nothing. I have been into this unit twice and can find nothing wrong. The E ! drum was stripped when originally built. I am concerned that I maybe have built something into this unit but can find nothing. Any thoughts would be appreciated, sorry for the long post. Pat.
> 
> Pat Schulte
> Aamco Transmission Temecula
> Temecula, California USA
> TRNW Member Since: 4/11/2008
> 
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