TRNW-2: 68rfe Rev Max parts

[Chris and Cathy Kershaw]

Thanks Robert.

On Thu, Oct 23, 2025 at 9:55 PM tranibob--- via trnw2 <trnw2 at trnw.net>
wrote:

> Note sure where the 220 PSI advertised came from or who was involved in
> that so called consensus that our Tuneless™ kit could cause line to go much
> higher then 220 psi forward, but whoever it was simply does not understand
> how line pressure is regulated in an RFE.
>
>
>
> Don’t just take my word for it, if you have any doubts, test it yourself
> to see it with your own eyes if you find hydraulic charts too difficult to
> follow. Pull the green wire out of the transmission connector going to pin
> 12 (line pressure solenoid control wire) or cut the wire and you will see
> that line will not go any higher than 172 psi on the scanner actual line
> pressure reading regular gauge if you trust that more at low RPM. During a
> WOT max RPM shift can sometimes make it go as high as high as high as 180
> psi at the transducer if you push it real hard and you have no leaks
> anywhere.
>
>
>
> 172 psi at the transducer with our kit means you have 220 psi of actual
> line pressure and at 180 psi at the transducer you only have 234 of actual
> line pressure. That not even close to what you get with the popular 225
> tunes and internal modifications or in even in the same ballpark as what
> you would get if you lost control of the line pressure solenoid with those
> modified unit. With our kit, there is no need for an added line pressure
> relief since the transmission cannot make more then 220-230 psi of line
> (RPM difference is what makes the range) in forward ranges.
>
>
>
> We do have a limit built in for the lock-up pressure so not to damage the
> converter, it is set a 180 PSI whether you drill the hole in the pump as
> per the instructions or you install our drop in TCC ACCUM because that’s as
> high as you can go to increase the lock-up clutch capacity without putting
> the converter in danger.
>
>
>
> The RFE pressure regulation unfortunately is quite different from more
> conventional PR systems we are used to, so it is easy to get scared for no
> reason when using a stronger PR valve spring and patented technology that
> makes the computer thinks the pressure is 30-32% lower than it actually is.
>
>
>
> If you are breaking parts and wondering what caused it, don’t hesitate to
> product support at (626) 443-7451 during business hours or email us at
> support at transgo.com (I answer all those emails) and we will be very happy
> to help you diagnose and find the root cause of the problem.
>
>
>
> I can’t be on here and other online forums as I used to be and would like
> to be, due to different assignments at the company. That being said, if any
> of this is not clear don’t hesitate to ask questions on here or directly to
> my email, this stuff is not voodoo, consensus amongst some or not, I’ll
> gladly fill in the blanks and try and take all the mystery out of our any
> of our kit do what they do.
>
>
>
> <http://www.transgo.com/>
>
> *Robert Moreau*
>
> *Technical Sales and Marketing Support Specialist*
>
> 2621 Merced Avenue El Monte, CA 91733 USA
> <https://www.google.com/maps/search/2621+Merced+Avenue+El+Monte,+CA+91733+USA?entry=gmail&source=g>
>
> *Calibration | Innovation |Performance*
>
> <https://www.facebook.com/TransGo-600961476956220> [image:
> 1475592640337_I] <https://www.instagram.com/transgoshiftkit> [image:
> 1475592655171_t] <https://twitter.com/transgoshiftkit> [image:
> 1475592664972_Y]
> <https://www.youtube.com/channel/UCg6v9MzFmq7g3fy7-r9PGIg> [image:
> 1475592672363_L] <https://www.linkedin.com/company/transgo1/>
>
>
>
>
>
> *From:* trnw2-bounces at trnw.net <trnw2-bounces at trnw.net> *On Behalf Of *Tod
> Chretien via trnw2
> *Sent:* Thursday, October 23, 2025 8:17 AM
> *To:* trnw2 at trnw.net
> *Subject:* Re: TRNW-2: 68rfe Rev Max parts
>
>
>
> Thank you Mark!
>
> The shop I used to work for in Stockton just built a 68RFE with a tuneless
> kit and it came back with the input drum exploded. And the builder here at
> Ralphs (Rodney) won't use the tuneless kit because he claims he a had
> couple come back on him with broken components. I always figured they must
> have installed the kit in a tuned truck. However I just confirmed that the
> one they just built in Stockton only has 160 psi commanded line pressure in
> drive, so it's not tuned.
>
> Things that make you go Hmmmmmm...
>
> --
>
> Best Regards,
>
> Tod Chretien
>
> TRNW Inc.
>
> https://www.trnw.net
>
>
>
> On 10/23/2025 6:59 AM, Mark Puccinelli wrote:
>
> No pressure relief system built into the tuneless kits.
>
>
>
> On Thu, Oct 23, 2025 at 6:47 AM Tod Chretien via trnw2 <trnw2 at trnw.net>
> wrote:
>
> >* general consensus was sometimes those tuneless kits put out way more
> than the advertised 220 or so psi*
>
> Don't they have a pressure relief built into that tuneless kit? Maybe one
> of the Transgo guys can comment on this statement. Mark? Robert? Randy? You
> guys home? LOL
>
>
>
> --
>
> Best Regards,
>
> Tod Chretien
>
> TRNW Inc.
>
> https://www.trnw.net
>
>
>
> On 10/22/2025 12:40 PM, Steve Everett wrote:
>
>     I've used both of those numerous times, but a little over a year ago I
> had a unit come back that had been out a few months,  the accumulators had
> blown out of the vb, pulling the heads off a couple of the screws and
> bending the plate a good bit, I posted about it on the forum, and general
> consensus was sometimes those tuneless kits put out way more than the
> advertised 220 or so psi ?
>
>
>
>    I've probably got 12 or 15 68rfe's out there with my name on them using
> the tuneless kits,  that was the only one that caused a problem as far as I
> know ?   but I've been a little hesitant to use them since then
>
>
>
>    Steve
>
>
>
> On Wed, Oct 22, 2025 at 2:43 PM Tod Chretien via trnw2 <trnw2 at trnw.net>
> wrote:
>
> That seems over-kill if it's not tuned. I would use the Transgo Tuneless
> kit myself. They shift great with that kit. I also like that Transgo OD
> pressure plate that allows for an additional clutch.
>
> --
>
> Best Regards,
>
> Tod Chretien
>
> TRNW Inc.
>
> https://www.trnw.net
>
> On 10/22/2025 10:06 AM, Steve Everett wrote:
>
>   I've seen the channel plate used in a couple shops I was at, by the
> other builder,  I've used the seperator plate on a lot of builds, even
> stock builds,  we've got a customer from out of town, broke down here, and
> he wants an upgraded rebuild, we're pricing him a Rev max drum, which comes
> already built ?  I didn't know that until I priced it, a billet input shaft
> and that valvebody kit,  the truck isn't tuned, totally stock, we are
> pricing in a billet converter of course,
>
>
>
>   Steve
>
>
>
> On Wed, Oct 22, 2025 at 12:59 PM Tod Chretien via trnw2 <trnw2 at trnw.net>
> wrote:
>
> I have used the separator plate and the channel plate but not their
> accumulators. The channel plate is needed on anything with a tune.
>
> --
> Best Regards,
> Tod Chretien
> TRNW Inc.
> https://www.trnw.net
>
>
>
> On 10/22/2025 8:30 AM, Steve Everett via trnw2 wrote:
> >    I have not used any of Rev Max's parts for these other than the
> > bonded seperator plate,  has anyone used their 68rfe-347 valve body
> > foundation build kit ?  comes with channel plate, seperator plate and
> > billet accumulators,
> >
> > Steve
> >
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>
>
>
>
> --
>
> *Mark Puccinelli*
>
> *Product Support Technician*
>
> *TransGo*
>
> *mark.puccinelli at transgo.com <mark.puccinelli at transgo.com>*
>
>
>
>
>
> *Adjunct Driveline Professor*
>
> *Skyline College*
>
> *San Bruno,CA*
>
> *puccinellim at smcc <puccinellim at smccd.edu>d.edu <http://d.edu>*
>
>
>
>
>
>
>
> Visit me on Facebook:
>
> https://www.facebook.com/mark.puccinelli.7
>
>
>
>
>
>
>
>
>
>
>
>
>
> --
>
> Best Regards,
>
> Tod Chretien
>
> TRNW Inc.
>
> https://www.trnw.net
>
> This message was sent from the TRNW Technical Discussion Forum (trnw2).
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