1
Installation Instructions
TH700-R4 (4L60) Transkit
Part No. 70233 1987 thru 1993
non-electronic models
Part No. 70232 1982 thru 1986
9500543-03
Printed in U.S.A.
© B&M Racing and Performance Products 2009
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 accom-
modate the 6 friction and 5 steel plate
package. The 6 friction plate pack-
age apply ring is 3.71" long com-
pared 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 re-
taining ring that can be used in pre-
1988 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 rec-
ommend that you consult the appro-
priate transmission service manual
for information regarding special
tools, assembly procedures, bolt
torques, service and diagnosis, etc.
for items not covered here. The fol-
lowing 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 in-
stalled in input housing, then in-
stall 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
Congratulations! You have just
purchased the most versatile re-
building kit available for the TH700
(4L60) transmission. The B&M
TH700 (4L60) Transkit contains
special parts and instructions to up-
grade 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 recom-
mend you consult the appropriate
GM service manual for your particu-
lar model year transmission. The
only parts that differ from the stan-
dard 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 assem-
bly and disassembly of the transmis-
sion.
IMPORTANT: We suggest that you
take the time to completely read
through the instructions and check
the parts list before beginning disas-
sembly.
You will need approximately 5 Qts
(14 pages)
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