B&M 117302 4L60E TRANSMISSION - Manual (Page 3)

FILL. Check for leaks around the oil pan, cooler lines,
etc.
2. CONTROLLING THE TORQUE CONVERTER
CLUTCH ENGAGEMENT
In stock applications the torque converter clutch (TCC)
engagement is controlled by either a speed dependent
hydraulic pressure signal from the TCC shift valve train or
ECM control depending on the valve body configuration.
When this control signal is present and the TCC solenoid
is energized the TCC Apply valve (located in the Oil Pump
Body) moves to engage the TCC. In most non-stock ap-
plications the ECM signal is not available to signal TCC
engagement. The TCC engagement on your B&M trans-
mission is controlled electrically.
There are two approaches to control the TCC. In the first
and simplest, the TCC solenoid is wired in series with a
normally open pressure switch in the 4th gear circuit (see
FIG. 2) and a switch attached to the brake pedal. With
this arrangement TCC engagement occurs when the trans-
mission shifts to 4th gear, also the TCC is automatically
disengaged when the brake pedal is depressed. See (FIG
2) for an example wiring diagram.
The second approach is to install a speed sensing device
(such as B&M P/N 70244 or 70248) which controls the
TCC engagement as a function of vehicle speed. This al-
lows TCC engagement to be adjusted to occur any speed
or gear (above 1st) which may be desirable for fuel
economy considerations. As a safety precaution a pres-
sure switch should also be installed in the 4th gear circuit
that acts in parallel with the speed sensor switch. The
pressure switch will insure TCC engagement in 4th gear
should the speed sensor switch become misadjusted or
inoperative. See (FIG. 3) for an example wiring diagram.
3. THROTTLE VALVE MECHANISM
The purpose of the TH700-R4 Throttle Valve (T.V.) and it’s
mechanical linkage is to control both the shift feel and
shift timing as a function of vehicle speed and load condi-
tions. As the accelerator pedal is depressed and the throttle
opens, the T.V. mechanical linkage relays the motion to
the throttle plunger in the valve body by way of the T.V.
cable. In factory installations of the TH700-R4 the geo-
metric relationship between the T.V. cable and throttle
shaft bellcrank produces the required T.V. cable exten-
sion (pull) to throttle opening for the transmission to func-
tion properly. In custom installations the correct T.V. cable
mounting geometry must be accurately determined if the
transmission is to function properly. It cannot be over-
stated that for the TH700-R4, proper T.V. cable installa-
tion and adjustment are paramount to proper transmis-
sion function and life. If the T.V. cable is not operating
correctly, the transmission life will be greatly reduced.
The following procedure will show you how to design a
custom T.V. Cable installation that works. The main ob-
jective is to accurately position the T.V. cable mounting
bracket in relation to the throttle shaft axis to obtain the
proper T.V. CABLE EXTENSION (PULL) TO THROTTLE
OPENING relationship.
STEP 1. Measure your T.V. cable to establish it’s particu-
lar mounting dimension (there are several lengths in use)
as follows (see Fig.4). Retract the slider by depressing
the lock tab then pull the cable housing until the flats on
the slider are flush with the end of the adjuster housing
then fully extend the cable by pulling the cable end fitting
out (slider must remain retracted) until it stops. Holding
the end fitting out, measure the dimension from the face
on the adjuster housing that registers with the mounting
bracket to the center of the cable end connector.
STEP 2. Add 3/16” (0.19 in.) to the measurement obtained
in Step 1, this is the perpendicular measurement from the
REAR FACE of the T.V. cable mounting bracket to the
WIDE OPEN THROTTLE position of the T.V. cable con-
nector pin on the throttle bellcrank (see Fig. 5).
STEP 3. The T.V. cable bellcrank must be perpendicular
(90 degrees) to the T.V. cable when the throttle is 25 per-
cent (1/4) open (see Fig. 5), this geometric relationship is
FIG. 4
3