B&M 80217 POWER SWITCH - Manual

9500282-06 Printed in the U.S.A.
I
nstallation Instructions
Power Switch
for GM Lockup Torque Converters
(All TH200C, TH250C, TH350C, TH200-4R
and 1982 thru 1989 TH700-R4)
Part Number 80217
© 2003, 2000 by B&M Racing & Performance Products
This kit will enable the driver to
control the operation of the torque
converter lockup clutch. The driver can
select between the converter's normal
function and having it unlocked in all
gears with a three speed automatic
transmission and in all gears but
overdrive (fourth) on four speed overdrive
transmission. Keeping the converter
out of lockup mode during city driving
saves wear and tear on the converter
clutch in addition to making the vehicle
more pleasurable to drive, as you will
no longer have the constant bump of
apply and release during stop and go
driving. The switch will not stop the
converter from locking up in fourth
(overdrive) gear of overdrive four speed
transmissions. GM four speed
transmissions should always be in
lockup mode in fourth gear due to the
increased possibility of overheating
the torque converter.
This kit will work on all TH200C,
TH250C and TH350C three speed
automatic transmissions. It will also
work with 1981-86 TH200-4R overdrive
automatic transmissions and on 1982
through 1989 TH700-R4 overdrive
automatic transmissions. (On 1990 and
later TH700-R4 transmissions the fourth
gear oil pressure tap has been
removed.)
Between 1979 and 1981 theTH200,
TH250 and TH350 three speed
automatic transmissions were made in
both lockup and non-lockup converter
versions. After 1981, only lockup
converter versions were manufactured.
A lockup torque converter transmission
can be identified by one or more wires
leading to a connector on the driver's
side of the transmission.
The power switch is simple to operate
and easy to install. You will need a
minimum of tools and mechanical
experience to install this kit. The tool
list and parts lists are on the last page.
Carefully read these instructions and
take your time with each step. INSTALLATION TH200C,
TH250C AND TH350C THREE
SPEED TRANSMISSIONS
STEP 1. Raise and support the vehicle
high enough to give yourself plenty of
room to work. Use jackstands or ramps
to support the vehicle safely. Do not
use a jack alone.
STEP 2. Locate the plastic electrical
connector on the driver's side of the
transmission. See Fig. 1. The
connector will have from one to three
wires connected to it. If there is more
than one wire, select the wire going to
the terminal marked "A" on either the
plug or the socket. Cut the selected
wire about 3-4" away from the plug.
Figure 1
Plastic electrical connector
for lockup converter switch