[DeTomaso] NPC: Automatic Trans Cooler

[Larry - Ohio Time Corp]

Hi Mike,

An auto trans lines run about 15 PSI pressure. It will pump out all the
fluid if you give it time. Should that line come off completely, in no time
at all.

NAPA makes a very good quality hose rated at something like 150 PSI, that
will work well for this. Replace them both.

You want to make sure that the line has a barb on the end of it to prevent
the hose from blowing off. If you are cutting the line a compression fitting
works well at that pressure. In a pinch I have flaired out then end of the
line a bit so the hose does not blow off. 

You may want to think about an external filter. Summit sells one that used a
normal Ford filter (PH8A) that I use on my trucks.

Fill slowly and a small amount at a time. The dip stick is generally in
pints not quarts. Over full can be as bad as under full.

At around 4K to 6K rebuild it is worth the time and care.


Larry (put a bigger cooler on too) - Cleveland




-----Original Message-----
From: detomaso-bounces at realbig.com [mailto:detomaso-bounces at realbig.com] On
Behalf Of Mike Thomas
Sent: Sunday, December 11, 2011 7:21 PM
To: detomaso at realbig.com
Subject: [DeTomaso] NPC: Automatic Trans Cooler

I have much more experience, mostly from participating in this forum for the
past 10 years, with manual transmissions rather than automatics.  I have a
'94 F250 4x4 with a factory installed trans cooler, which I picked up only a
couple of months ago and am going through to find things that need fixing.
When I was under the front of the truck today installing a set of fog lamps,
I noticed a trans fluid leak in one of the feed lines to the trans cooler,
which is mounted up with the radiator.  The leak was from one end of a short
piece of rubber tubing clamped to opposing ends of a break in the hard line.

I tried replacing the clamps with encapsulated versions, but I must have
pinched the rubber hose in the process, and thank goodness I only had a
short drive to the Home Depot and back before I realized I was spraying
trans fluid all over the front axle.  Clearly, I need to replace the 3"
piece of rubber tubing, and will have to replace what fluid I loose when I
pull the hose, but I have two questions:

*	Will this likely dump the entire trans worth of fluid, or only a
portion?  I expect that's as much a function of how high on the trans the
hardline is connected, which I can trace.
*	Will simply refilling the trans as needed from the top take care of
it, or is there some sort of bleeding process required here as with a
cooling system?

Thanks
Mike Thomas



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