Can’t See the Converter for the Trees
time, a partially
restricted internal
thermostat may
cause premature
converter failure.
On some 2006
vehicles the trans-
mission cooler
may be part of
the air condition-
ing condenser. The
example shown is
a 2006 Jeep Grand
Cherokee (figure Figure 3 Figure 4
7). As you can see,
replacing the transmission
cooler would involve replace
the A/C condenser, too. This
requires special tools and
equipment, and must be per-
formed by a certified A/C
technician. A simpler solu-
tion may be to bypass the
factory cooler with a stand-
alone replacement cooler.
This next example will
affect all Chrysler and Dodge
vehicles. A warped transmis-
sion pump stator support or Figure 5 Figure 6
pump body will cause prema-
ture torque converter failure
and set TCC codes (figure
8). It may also cause engine
stall when hot; engine stall
when cold is usually caused
by a restricted cooler.
You can check the pump
body and stator support
with compression film or
Plastigage
®
to identify any
warped areas: Up to 0.003”
clearance is acceptable.
Figure 8
Then there’s the issue of
the sealing ring on the 48RE
units. Some pumps have a
ring groove; others don’t.
And some converters will
accept a ring; others won’t
(figure 9).
You can use either pump
with either converter, but if
you use a pump that has a
Figure 7
ring groove with a converter enough trees to prevent you
that won’t accept a ring, you must leave from wasting time swapping
the ring off. So far, the ATRA HotLine out torque converters, while
hasn’t received any calls indicating a providing some possible
problem caused by leaving the ring “root” causes for converter
off. failure.
I hope this information clears away Figure 9
6 GEARS March 2010
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