Change for Change’s Sake?
Another, more
costly repair, and
one that many
rebuilders prefer,
is the aftermarket
billet version of the
4L80E piston.
up issues including slip codes, no con-
verter clutch engagement, or a shudder
during engagement.
A few years ago, at a TCRA semi-
nar, I learned that these 4L80E con-
Figure 3
verters had design issues and that the
new clutch would crack. This can be
repaired by running a bead of weld 360º
around the cracked area. Many build-
ers use this process with good success
(figure 2).
Another, more costly repair, and
one that many rebuilders prefer, is the
aftermarket billet version of the 4L80E
piston (figure 3). It’s relatively low
cost, particularly when you compare it
to the cost of a comeback, and you have
that added peace of mind that it’s not
going to crack again. Many shops use
this clutch piston as a sales feature for
the heavy duty enthusiast.
Dodge 47-48RE and RH
The next torque converters we’ll
look at are the Dodge Cummins diesel
47-48RE and RH, which have been
around since 1994. Chrysler did an
awesome job by designing a torque
converter that holds up throughout the
Figure 4
manufacturer’s warranty.
Today, many of these vehicles are
still in service and are out of warranty.
With this design we usually see wear in
Many shops have seen a sharp increase
in the repair of these vehicles. This
the center of the piston where it seals on
310mm converter is one of the biggest
the turbine hub. Typically valve body
torque converters out there, next to the
Allison 1000-2000.
wear will cause the problem.
This torque converter has a few
design issues that can be easily repaired
to make it last considerably longer this design we usually see wear in the Once the center of the piston
than the factory setup. Just like the center of the piston where it seals on the wears out it rips or damages the turbine
4L80E, the piston has the potential to turbine hub. Typically valve body wear seal. This allows the oil to escape and
cause major lockup problems. With will cause the problem (figure 4). create a shudder or prevent lockup.
22 GEARS March 2010
Page 1 |
Page 2 |
Page 3 |
Page 4 |
Page 5 |
Page 6 |
Page 7 |
Page 8 |
Page 9 |
Page 10 |
Page 11 |
Page 12 |
Page 13 |
Page 14 |
Page 15 |
Page 16 |
Page 17 |
Page 18 |
Page 19 |
Page 20 |
Page 21 |
Page 22 |
Page 23 |
Page 24 |
Page 25 |
Page 26 |
Page 27 |
Page 28 |
Page 29 |
Page 30 |
Page 31 |
Page 32 |
Page 33 |
Page 34 |
Page 35 |
Page 36 |
Page 37 |
Page 38 |
Page 39 |
Page 40 |
Page 41 |
Page 42 |
Page 43 |
Page 44 |
Page 45 |
Page 46 |
Page 47 |
Page 48 |
Page 49 |
Page 50 |
Page 51 |
Page 52 |
Page 53 |
Page 54 |
Page 55 |
Page 56 |
Page 57 |
Page 58 |
Page 59 |
Page 60 |
Page 61 |
Page 62 |
Page 63 |
Page 64 |
Page 65 |
Page 66 |
Page 67 |
Page 68