B&M TRANSPAK User Manual

Installation Instructions

Transpak 1982-93 GM TH-700R4

(4L60) Non Electronic Transmission

Part Number 70235

The B&M TH-700 (4L60) Transpak has been designed to work on all 1982

thru 1993 TH-700’s (4L60's). This kit WILL NOT work on 1992 and later

4L60E (electronic) models. During 1982 thru 1993 model years four major changes were made to the TH-700’s hydraulic circuitry. It is important that you know the year model of the transmission your working on so that you can identify the correct checkball placement diagram. Figure 1 describes where to look on your transmission for model year identification. If the original transmission in your vehicle was replaced by a factory rebuild, the I.D. number may have been changed. In this case you will have to compare the components in your transmission with the check ball placement diagrams in the instructions to determine the correct check ball placement.

WARNING: Incorrect checkball placement can result in serious transmission damage. Be sure to follow the instructions carefully.

We have included a section on TV cable installation that will be helpful to individuals using the TH-700 with aftermarket carburetors, manifolds or in a custom vehicle installation. B&M's TH-700 Transpak can be installed by anyone with minimum mechanical experience. It is however, im-

portant to closely follow the instructions.

We recommend that you read through the instructions completely before beginning the installation, so you can familiarize yourself with the installation procedure and tools required. Check the tool list at the end of these instructions for the tools required to install your B&M TH-700 Transpak. NOTE: The B&M TH-700 Transpak is

not a cure-all for an ailing transmission. If your transmission is slipping or in poor general shape, the installation of this Transpak may worsen the condition. However on a properly operating transmission in average condition, the Transpak will provide the kind of transmission performance your looking for. When installing your Transpak there are several other B&M products you may wish to consider: TH-700 R4 KICKDOWN KIT #70237 The TH-700 has a hydraulic circuit that causes a forced 4-3 down shift whenever the throttle is opened past two thirds travel. In some applications a part throttle forced 4-3 down shift is undesirable, after many customer requests B&M has developed an easily installed kit that will eliminate the part throttle 4-3 down shift feature. This kit does not alter normal shift speeds or

affect detent (wide open throttle 4-3) operation. This kit is best installed along with B&M’s #70235 Transpak. However it can also be installed independent of other modifications, and valve body removal is not required (pan gasket not included).

Converter Lockup Control #70244/ 70248 Provides electronic control of

the vehicle speed where lockup takes place on GM transmissions with lockup converter. Eliminates lock and unlock cycling and premature unwanted lockup. Also ideal for lockup operation in vehicles that did not come with lockup converter transmissions. Works with all GM lockup transmissions. TRANSMISSION OIL COOLER We feel that it is very important that every vehicle in addition to the radiator heat exchanger should have an oil cooler. Heat is the major cause of transmission failures, and an oil cooler is an inexpensive safeguard against overheating. B&M offers a wide range of transmission coolers to suit every need, which are available at your B&M dealer. The TH-700 runs hotter than most other automatic transmissions, making an oil cooler almost a necessity.

TRICK SHIFT PERFORMANCE ATF

Trick Shift performance automatic transmission fluid is the industry’s leading performance ATF. A specially blended

Printed in U.S.A.

9500260-12

oil with foam inhibitors, extreme pressure agents and shift improvers, this fluid assures protection while delivering the fastest possible shifts. You literally “Pour in performance.” Available at your B&M dealer. DRAIN PLUG KIT #80250 TH-700 transmissions do not come from the factory equipped with drain plugs. The B&M Drain plug kit is inexpensive and easy to install. It eliminates the mess of a fluid change or pan removal. POWER SWITCH KIT #80217 (1982 through 1989 TH-700’s only) This kit will enable you to select between normal Torque Converter Clutch (TCC) operation and having it unlocked in all gears except fourth. This kit can also be utilized for TCC control in custom installations of the TH-700. Keeping the TCC in the unlocked mode during city driving saves wear and tear on the TCC as well as minimizing TCC engagement at low speeds. The B&M Power Switch Kit will not prevent the TCC from locking in fourth gear (overdrive). TCC engagement in fourth gear is required to prevent transmission overheating. Kit does not work on 1990 or later TH-700’s.

TH-700 DEEP OIL PAN #70289 The B&M TH-700 deep oil pan ads approxi-

mately 3 quarts of extra oil capacity to your transmission. The additional oil capacity will help reduce the temperature of your transmission, thereby promoting longer transmission life.

TEMPERATURE GAUGE KIT #80212

Most transmission and converter failures can be traced directly to excessive heat. The B&M transmission temperature gauge can save you a costly repair bill by warning you ahead of time of an overheated transmission. The B&M temperature gauge is extremely accurate and dependable, it comes with all necessary hardware and is easy to install.

INTRODUCTION

This kit can be installed in a few hours by carefully following the instructions. Read all instructions first to

familiarize yourself with the parts and procedures. Transmission com-

ponents are precision fit, work slowly and do not force any parts. Burrs and dirt are the number one enemies of an

Figure 1

automatic transmission. Cleanliness is very important, so a clean work surface from which oil can easily be removed is necessary.

This kit contains all parts necessary to obtain two different levels of performance, depending on intended use:

1. Heavy Duty; Towing, campers, motor homes and 4-wheel drive vehicles. Shift feel is firm and positive.

2. Street; Dual purpose performance vehicles, street and strip performance cars. Street level produces the firmest shift feel.

DISASSEMBLY

Automatic transmissions operate at temperatures between 150° F and 250° F. We suggest the vehicle be allowed to cool for several hours before disassembly to avoid burns from hot oil and parts. Have an oil drain pan ready to catch oil and a tray on which to put small parts so they won’t get lost. The vehicle should be raised so there is at least 2 feet ground clearance for ease of installation and safety.

MAKE SURE THE VEHICLE IS RIGIDLY AND SECURELY SUPPORTED, JACK STANDS, WHEEL RAMPS OR

A HOIST WORK BEST, DO NOT USE JACKS ALONE. STEP 1. The TH-700 does not have a

drain plug. Position your drain pan beneath the transmission to catch the oil. Remove the oil pan by removing the rear bolts first, then work towards the front. Loosen but do not remove the three front bolts. If the pan sticks to the gasket, insert a flat screwdriver between the pan and case and pry down gently to break the pan loose. Now remove the front three bolts slowly to permit draining the rest of the oil. Remove pan gasket material from the pan and the case. STEP 2. Remove the oil filter by gently pulling it straight down. The pickup tube has an O-ring (or seal) around the end that fits into the pump housing. Sometimes the O-ring (or seal) remains in the pump bore, if so remove Oring (or seal) from the pump and discard both the O-ring ( or seal) and filter. STEP 3. (See Figs. 2 and 3) There are a variety of different wiring harnesses used on the TH-700. Before proceeding further make a sketch and some notes describing your particular unit, recording which connectors go to which switch. Notice that the connec-

tors are color coded. Now remove connectors from switches. Unplug the wiring harness from the case electrical connector by prying the lock tab away from the plug and pulling down on the plug, do not pull on the wires. Removing solenoid is not required, just tie the wires up out of the way. STEP 4. Remove all except the center valve body bolt (See Fig. 2.) Beginning with the mid 1987 model year, TH700’s have a tube crossing over the valve body. This tube is removed by simultaneously pulling both ends out of their respective bores. With the tube removed (if equipped) hold the valve body up firmly with one hand and remove the remaining bolt slowly. There are several check balls in the valve body along with several pints of oil. Have your drain pan ready to catch the oil and check balls (should they fall out.) Save all check balls in a safe place where they won’t get lost. STEP 5. Beginning mid 1987 model year, TH-700’s have an auxiliary valve body located where earlier models have a cover plate (See Fig. 2.) Remove the cover plate or auxiliary valve body. Be careful not to drop the check ball located in the auxiliary valve body (See Fig. 8.) Remove the 1-2 accumulator housing while holding the separator plate up to the case. Then slowly lower the separator plate and retrieve the check balls located above the plate. Make note of the color and location of the 1-2 and 2-3 accumulator springs for correct reassembly (See Fig. 10.) Remove all old gasket material from

Servo vent

Do not block

this hole

Throttle valve

linkage

Filter retaining

spring

1-2 accumulator

housing

Converter clutch

lockup solenoid

Crossover

tube

Selector lever

detent spring

body

Electrical

connector

Auxiliary valve

Figure 2

these parts. Note: Early 1982 TH-

700’s had a support plate located under the 1-2 accumulator housing. If your transmission is fitted with

this plate, carefully save the gasket as you will have to re-use the gasket upon reassembly (Gasket GM P/N 8642129 is not included in kit.)

MODIFICATIONS

STEP 6. Using the supplied drills, en-

large the holes in your separator plate as indicated in Fig. 4. Carefully deburr the holes after drilling. STEP 7. Rinse off valve body with clean solvent to remove any dirt or grit. Move to a clean working area. The valve body consists of precision fit components which will not tolerate dirt or burrs.

STEP 8. Heavy Duty and Street; MTV upshift valve (See Fig. 5.)

Remove the pin at the end of the MTV upshift valve bore. Remove the plug, valve and spring from the bore. Set the spring aside (it will not be re-used.) Reinstall the valve, plug and pin in reverse order of removal.

STEP 9. Street Only; Line bias valve.

Compress and remove the large roll pin retaining the line bias valve (See Fig.

5.) Take care to not distort the roll pin more than is required to remove it. Remove the aluminum plug, valve and spring from bore. The spring will not be re used. Insert the blocker rod from the kit into the bore. Install the valve and aluminum plug as removed. If the aluminum plug extends into the roll pin hole, remove the blocker rod and grind or file a small amount from either end of the blocker rod until the aluminum plug clears the roll pin hole when all parts are installed.

STEP 10. Heavy Duty and Street; Pressure regulator.

Remove the snap ring at the end of the pressure regulator bore in the oil pump assembly (See Fig. 6.) Use a screw- driver to hold the pressure regulator assembly while removing the retaining ring. If the sleeves stick in the bore, lightly rap the sleeve with a small rod and a mallet. Remove two sleeves with valves and the pressure regulator spring. The pressure regulator valve may fall out but it does not need to be removed.

Wiring harness plug

Figure 3

Note: additional model year I.D.

1982 thru mid-87 (2) holes

mid-1987 to 1988 (2) holes

1988 and later (1) hole

Drill 1/8" (.125")

Drill 3/32" (.094")

Figure 4

Reassemble the pressure regulator assembly using the BLUE spring from the kit (See Fig. 7.) Use the new retaining ring from the kit. Make sure the retaining ring is firmly seated in its groove when assembled. CAUTION:

The pressure regulator valve train MUST be installed in the proper order with the sleeves and valves oriented in the indicated directions.

There are several ways the sleeves and

Pry lock tab aside

to remove plug

Drill 1/8" (.125")

valves can be installed, however, only the orientation shown will work properly. Improper installation will cause low line pressure, resulting in slipping clutches and burned friction elements. It is very important to reassemble the pressure regulator correctly to insure proper operation of the transmission. Take a little extra time with this step and work slowly. This is a precision fit valve assembly so do not force the

Aluminum plug

recess should

face out

Roll pin

MTV upshift

valve

Remove

spring

Street level only, replace line

bias valve spring with blocker

rod from kit

Line bias

valve

Aluminum plug

recess should

face out

Large diameter

roll pin

Pressure

regulator bore

Figure 5

Pressure regulator valve assembly must

be installed as shown in this order

Pressure regula-

tor retaining ring

Manual valve link must

be assembled as shown

Figure 6

Figure 7

+ 9 hidden pages