TRNW-2: 68RFE Is there a way to reprogram Trans on a deleted PCM

[Chris and Cathy Kershaw]

Really depends on the deal made in the beginning. Did he sneak in or did
the shop let him in?

If he said build me a hot rod unit and you agreed not understanding what
that meant you’re kind of stuck with that deal. Might mean pulling at
upgrading some things, if he’s reasonable you’ll at least get paid for
additional hp parts on that.

If he said it’s *just deleted*, little baby fuel mileage tune, he’s stuck.
In that latter case I’d require removal of the power knob, tuned for stock
hp and no trans tune, otherwise no warranty.

I’ve also given a customer or 2 their money and their keys back. Sometimes
it’s just not worth the fight.


On Fri, Mar 21, 2025 at 10:13 PM tucker tuckertrans.com via trnw2 <
trnw2 at trnw.net> wrote:

> Group,
> I have a 2020 68RFE that has 80,000 and burnt the ODs up shortly after the
> def was deleted.  We rebuilt the transmission and noticed the Desired Line
> PSI commanded 170 in Drive at a WOT stall.  I've been told anything over
> 160 suspect the transmission has been tuned.  When we rebuilt it we added a
> Transgo OD pressure plate to up the clutch count.  We Sonnified the pump
> with TCC valves that were worn, and did our normal OH that included a
> Sonnax swtich valve ream.  Anyway with it back in the truck we notice this
> truck is loaded with HP.  It has a knob on the dash that has 1-5 setting,
> and on the 5 it is way more HP that I feel our transmission can take.  It
> also seems the shifts are too quick.  I wish I could just program it back
> stock, but that would mess up the delete.  So what are you guys doing in a
> case like this?  Is there a way to program the TCM part of the PCM back to
> stock?   This being a 2020 doesn't the PCM has to be unlocked to tune or is
> that just and HP Tuner way?  Does anyone have a clue what programming uses
> a rotary knob that has 5 settings?  I try to avoid these type jobs, but
> this one slipped in on us.
> Dan Tucker
>
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