B&M TRANSKIT User Manual
Installation Instructions
TH700-R4 (4L60) Transkit
Part No. 70232 1982 thru 1986
Part No. 70233 1987 thru 1993
non-electronic models
© B&M Racing and Performance Products 2009
Congratulations! You have just
purchased the most versatile rebuilding kit available for the TH700
(4L60) transmission. The B&M
TH700 (4L60) Transkit contains
special parts and instructions to upgrade your stock TH700 (4L60)
transmission to the same specifica-
tions used by B&M for building High
Performance Street Strip TH700’s.
For transmission assembly and
disassembly procedures we recommend you consult the appropriate
GM service manual for your particular model year transmission. The
only parts that differ from the standard assembly and disassembly are
the valve body and accumulators
(covered in the 70235 instructions)
and the 3-4 clutch and the drain plug
(covered in these instructions).
The TH700 (4L60) is a METRIC
dimensioned transmission so you
will need metric sockets and
wrenches, in addition some of the
overhaul procedures REQUIRE
SPECIAL TOOLS for proper assembly and disassembly of the transmission.
IMPORTANT: We suggest that you
take the time to completely read
through the instructions and check
the parts list before beginning disassembly.
You will need approximately 5 Qts
ATF for the transmission and 6 Qts
for the converter
3-4 CLUTCH INSTA.08LLATION
The B&M 3-4 clutch pack uses
the maximum number of standard
thickness plates (6 friction and 5 steel)
possible (see Figure 1). If the unit
you are working on had 5 friction and
4 steel plates you will have to replace
the 3-4 apply ring (see Figure 3) with
G.M. part number 8642374 This part
number has been discontinued by
GM, but is available from Transtar
Industries, Cleveland, OH, as P/N
D61975 Call 1-800-321-8830 for the
location and number of their nearest
location. This apply ring will accommodate the 6 friction and 5 steel plate
package. The 6 friction plate package apply ring is 3.71" long compared to 3.88" for the (5 friction plate
package).
In some cases there is room to
install a seventh friction plate in the
clutch. See the section "Additional
Clutch Plate" on the next page.
A new 3-4 clutch apply plate is
supplied with this kit. The new apply
plate replaces both the apply plate
and the 3-4 clutch retainer. Figure 4
shows the old and new parts.
The selective 3-4 clutch backing
plate is not included as part of this kit.
If the existing backing plate does not
produce the required clutch pack
clearance you will have to obtain the
correct backing plate from a G.M.
parts dealer. We have included a thin
(.094") 3-4 clutch backing plate retaining ring that can be used in pre1988 units in place of the thicker
(0.125") ring to extend a particular
backing plate’s adjustment range.
Installation of B&M’s 3-4
CLUTCH PACK is similar to install-
ing a stock 3-4 clutch pack. We recommend that you consult the appropriate transmission service manual
for information regarding special
tools, assembly procedures, bolt
torques, service and diagnosis, etc.
for items not covered here. The following instructions assume the input
housing is assembled up to the point
where the 3-4 clutch pack is to be
installed.
INSTALLATION (See Figure 3)
STEP 1. Make sure the correct (3.71")
3-4 clutch apply ring (#100) is installed in input housing, then install the following:
1. A new 3-4 clutch apply plate (#102).
NOTE: This apply plate does not
require the use of the original 3-4
clutch apply ring retainer.
2. B&M supplied 3-4 clutch plates
(#103), starting with composition
faced plate first and alternate with
Printed in U.S.A.
1
9500543-03
steel plates (EXCEPTION: '87-'93
install 15 tooth steel first).
IMPORTANT: Index the five (5)
wide slots on the steel plates with
the wide slots in the input housing.
The wide slots are clearance for
the 3-4 clutch boost springs (#106)
that will be installed after checking
the clutch pack clearance.
3. Install original 3-4 clutch backing
plate (#104) and thin (0.094 in.)
retaining ring (#105) supplied with
kit ('82-'86 only). The original backing plate may be too thick in which
case you will have to use a thinner
backing plate. Install the 3-4 clutch
backing plate with chamfer side
up.
CLUTCH CLEARANCE CHECK
STEP 2. 3-4 CLUTCH CLEARANCE
WARNING: Do not omit this step,
optimum 3-4 clutch operation and
durability depends on proper clutch
pack end clearance setting.
1. Check the end clearance between
the 3-4 clutch backing plate (#104)
and the first composition faced
plate (#103) with a feeler gage.
Check the clearance all the way
around between the plates to insure that the gap is uniform (plates
are parallel). If the gap is not uniform all around, recheck the installation of the individual 3-4 clutch
parts to determine cause.
2. Select the proper backing plate
(#104) thickness from the chart
(Figure 2) to obtain the correct
clutch clearance. You can use the
thick (0.125 in.) or thin (0.094") 34 Backing plate retaining ring
(#105) in combination with selective backing plates for additional
clearance adjustment range ('82'86 models only).
IMPORTANT: The 3-4 clutch pack
end clearance has a direct effect
on 2-3 shift feel. For high perform-
ance applications the best 2-3 shift
feel and 3-4 clutch pack life is
obtained when the 3-4 clutch clearance is set as close to the low side
of the chart tolerance as possible.
CAUTION: DO NOT set the 3-4
clutch pack end clearance below
the minimum dimension specified.
ADDITIONAL CLUTCH PLATE
If you need additional clutch capacity in the 3-4 clutch, it is possible
to add a seventh friction plate to the
clutch in many case. As normally
assembled, there is a steel plate between the 3-4 clutch apply plate and
the first friction plate. In many cases
the stack up of the clutch allows room
for an additional friction plate to be
installed between the apply plate and
the steel plate with the use of a thin
backing plate. The correct clutch
clearance must be maintained with
the extra plate.
3-4 CLUTCH FINAL ASSEMBLY
STEP 3. Once the correct 3-4 clutch
clearance has been determined
the 3-4 clutch boost springs can be
installed.
1. Remove 3-4 clutch Retaining ring
(#105) and Backing plate (#104).
2. Install the five (5) 3-4 clutch boost
spring assemblies (#106) as shown
in ( Figure 2). Install the boost
spring assemblies so the captured
end of the springs face the clutch
backing plate. IMPORTANT: The
3-4 clutch boost springs are designed for use ONLY with the
(3.71") long 3-4 clutch apply ring.
The boost springs can be used in
five (5) friction plate clutch packs
BUT you must install two (2) extra
steel plates in the clutch pack to
prevent the boost springs from becoming coil bound (solid) as the
clutch pack wears.
3. Install the 3-4 clutch backing plate
(#104) then compress 3-4 clutch
boost springs and install 3-4 clutch
retaining ring (#105).
BEFORE OPERATING VEHICLE
Once the transmission is installed in
the vehicle it is important to verify that
the transmission’s hydraulic system
is functioning properly to prevent pre-
mature component failure. At B&M,
every transmission we build is thoroughly tested on a commercial transmission test stand to verify proper
operation and correct oil pressures.
We realize that a test machine is not
available to most people using this kit
however, we strongly recommend
checking for correct oil pressures.
Checking the oil pressures BEFORE
driving the vehicle should be considered cheap insurance when compared against the cost of rebuilding
the transmission a second time because a minor problem was not detected. Oil pressure tap locations,
appropriate pressure charts and
trouble shooting guides are provided
in most service manuals. You will
need a 0-300 PSI gage to check the
pressures. Make sure the T.V. cable
is properly connected and adjusted
before checking oil pressures or operating the vehicle.
DRAIN PLUG INSTALLATION
Locate mounting position inside pan
for B&M Drain Plug. Make sure to
avoid locating plug where it could
interfere with internal transmission
parts, i.e. valve body, filter, servo,
etc.
Drill 1/2" diameter hole in position
determined. Remove all burrs
around hole and clean pan to avoid
contamination of transmission fluid.
Install Drain Plug as shown in figure.
Tighten nut to 25 lb.ft. maximum.
Use wrench on bolt head to prevent
rotating entire assembly. (Figure 5)
PLATE TYPE THICKNESS QUANTITY
REQUIRED
FLAT STEEL 1.97mm (.078") 5
CLUTCH PLATE
COMPOSITION FACED 2.03mm (.079") 6
CLUTCH PLATE
Figure 1: 3-4 Clutch Information Chart.
2
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