TRNW-2: 10R80 Air Testing Results

[pat schulte]

They do aircheck poorly. I have found that they usually will not test well
with 35# of pressure. Standard build for us is the CDF drum, the hub, and
OE friction and gasket set. I have found after I build it, the rings will
not check usually, they will leak very badly with lower pressure, but if I
hit them with full air pressure, sometimes it takes a few seconds, you will
hear the ring all of the sudden seal up pretty tight. As long as it does
that it will work.

On Mon, Feb 17, 2025 at 8:51 AM Healy Powertrain via trnw2 <trnw2 at trnw.net>
wrote:

> Hi Group!
>
> Happy Presidents Day!
> Since its 10R80 week I decided to get one too:
> I got a 2020 Ranger here with a 10R80, 90.000 miles
> Stops shifting at 7th>No 8-10.  The shifting its doing isnt all that great.
> Upon inspection discovered:
> D-Clutch Burned (Blackened Steels, not spotted, frictions darkened, but
> not gone)
> E-Clutch Burned (Blackened Steels, not spotted, frictions darkened, but
> not gone)
> CDF Drum Bushing has moved 0.050" (ring marks still in between holes)
> Outer Shell hammered by F-clutch frictions
> All Input Shaft plugs in place and not leaking.
>
> Air test of A, B, E all ok
> Air Test C, D, F all leaking and cross leaking. Not big leaks, hard to
> say, but clutches arent applying at 35 PSI Air.
> ABCDF air tested from pomp surface
>
> My question is does this slight bushing movement cause this leakage and
> cross leakage or do those Solid seals just air test poorly? Remember C and
> F Frictions are as good as new.
> Its going to get a drum and Shell anyway, but i think with the way it is
> it should shift all gears?  Whadda yall think?
> Thanks for any input!
>
>
> Best Regards,
>
> Marcel Verwijmeren
> Healy Powertrain
> Driveline Solutions
> T 06 57745407
> E info at healypowertrain.com
> W www.healypowertrain.com
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-- 
Pat Schulte
AAMCO Transmissions
Temecula, Ca.
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