2
Part # TCI-9006
Revised 9/6/2016
Toll Free: 1.888.776.9824
www.tciauto.com
TCI
®
Automotive
151 Industrial Dr.
Ashland, MS 38603
Phone: 662.224.8972
Step 4 — Installation of TCI Wiring Harness:
Most applications will accept the OE solenoid.
All
two-wire solenoids are
acceptable. If you
have a solenoid with only one wire, it
cannot
be
used. You may purchase the proper solenoid
from GM, part number 8654126. Using your
OEM, two-wire solenoid, cut both wires
allowing about 2-1/2" for splicing to the TCI
®
wiring harness. (
Note:
Look closely at the black
plastic connector on the new TCI
®
harness.
Notice that each terminal position is labeled A
through D. This instruction will refer to these
positions so that your connections are made
properly.) To connect your solenoid to the TCI
®
wiring harness, use the splice connectors
provided. Connect the positive solenoid wire to
the wire going to Terminal A on the wiring
harness, then connect the negative solenoid wire
to the harness wire going to Terminal B.
Install wiring harness and solenoid into the
transmission. Torque the solenoid bolts to 8
foot-pounds. Plug the two pressure connectors
into the fourth pressure switch on the valve
body. Reinsert the black plastic transmission
case connector into the transmission. If you are
working with a 700R4, you may want to transfer
your OEM plastic wire retainer from your
factory wiring harness to the TCI
®
wiring
harness in order to keep wires neatly in place.
Step 5 — Figure 4
shows how the external
wiring harness is intended to be connected. To
use the #4 machine screw to retain the switch to
the case, a new 3/32" hole must be drilled in the
mount boss. If floor pan clearance is a problem
then secure the ring terminal to the mount boss on the case to provide a good ground and secure the
switch to the wiring harness with electrical tape so that it does not bang around. Some 2004R’s may
have an interface problem between the TCI
®
harness and the OEM case connector. To correct this
problem, obtain case connector number 8634383 from a GM dealer. This will allow the TCI harness to
snap into place. Using 18-gauge wire, run a 12-volt source to the red wire on the harness (Terminal A).
Connect the vacuum switch to a ported vacuum source on the carburetor or throttle body. (If you find
that the TCC operation is erratic in your application, then you may try moving the vacuum source to
the manifold.) The TCC is now set to engage automatically in 4th gear only when engine vacuum is
Figure 2: 700R4 Competition/Full Manual
(376010 valve body) Wiring Diagram
Figure 3: 2004R Street/Strip or
Competition/Full Manual
(386010 valve body) Wiring Diagram
