GM 4L60, 4L60-E, 4L65-E, 4L70-E Servo Release Check Valve Kit
T R A N S M IS S ION PART S Instructions
GM 4L60, 4L60-E, 4L65-E, 4L70-E
Servo Release Check Valve Kit
Orifice "A"
Part No.
77701-076
Valve
• Valve • O-Ring Patent No. 5,536,221
O-Ring Groove
WARNING: Must be used with properly functioning OE capsule.
O-Ring
WARNING
1. D etermine Servo Application a. Sonnax servo release check valve comes ready to install in units with OE servos with casting numbers 8642554, 8642553 and 24229159. If casting number on inner recess of servo piston housing is missing or illegible, measure to determine which servo is in use (Figure 1). b. Servos with part number 8642093 and Sonnax servos 77701-04K and 77911-03K (Figure 1) have greater volume and require more oil flow. When using these servos, orifice "A" on Sonnax check valve should be enlarged to .120 – .125" using a #31 drill bit (main picture). Ensure debris is cleared from valve after enlargement.
NOTE: Drill carefully; too large an orifice will cause 2-3 flares or bump shifts.
4L70-E
b. Install Sonnax check valve into same bore as OE capsule, tapered end first (Figures 3 & 4, page 2).
Figure 1
4L60/E 2nd Gear Servo Apply Area Common V6-V8
3. Installation & Assembly a. Ensure OE 3rd accumulator checkball capsule is installed and seals without leaks or seepage.
CAUTION
Smallest OE Apply Area 4cyl-V6
2. Spacer Plate Modification a. For normal use, NO plate modification is necessary; proceed to step 3 "Installation & Assembly". b. For moderate performance applications, enlarge appropriate orifice to .090" using #43 drill bit (Figure 2, page 2). c. For maximum performance applications, enlarge appropriate orifice to .100" using #39 drill bit (Figure 2, page 2).
Largest OE Apply Area Camaro & Corvette
17% Larger than Corvette Apply Area
NOTE: Bore variation is common. Install Sonnax check valve without O-ring; if valve slides in without resistance, remove valve. Install Sonnax O-ring, lubricate and roll on clean bench to size O-ring into groove, then reinstall. O-ring ensures good hydraulic seal in cases with enlarged bores.
c. Installed valve should be slightly below flush to avoid spacer plate interference and damage.
2.523
2.312
2.075
1.792
1.310
Casting # 8642554
Casting # 8642553
Casting # 24229159
Casting # 8642093 Sonnax P/N 77701-04K
Sonnax P/N 77911-03K
©2016 Sonnax Industries, Inc. 800-843-2600 • 802-463-9722 • F: 802-463-4059 • www.sonnax.com
NOTE: If check valve requires removal for any reason, a #5 easy-out can be used or the valve can be tapped and removed with bolt and puller.
77701-076-IN 05-13-16 Page 1
T R A N S M IS S ION PART S Instructions
SERVO RELEASE CHECK VALVE KIT 77701-076
4L60 Spacer Plate
4L60-E Spacer Plate
• For normal use: NO plate modification is necessary.
Figure 2
• For maximum performance applications: Enlarge noted orifice to .100" using #39 drill bit.
• For moderate performance applications: Enlarge noted orifice to .090" using #43 drill bit.
4L60-E Transmission Case
Figure 3
4L60 Transmission Case
Figure 4
Check Valve with O-Ring
Check Valve with O-Ring
Figure 5
Ex.
Ex.
Use OE 3rd accumulator capsule. Sonnax 77701-076 Servo Release Check Valve Install Sonnax check valve into bore over OE capsule. Installation Location Transparent View ©2016 Sonnax Industries, Inc. 800-843-2600 • 802-463-9722 • F: 802-463-4059 • www.sonnax.com
Figure 6 #7 OE 3rd Accumulator Capsule
Sonnax 77701-076 Servo Release Check Valve Ex. 2nd Apply Pressure
4th Apply Pressure
3rd Accumulator/3-4 Clutch Apply Pressure
2-4 Servo Assembly Cross Section 77701-076-IN 05-13-16 Page 2
GM 4L60, 4L60-E, 4L65-E, 4L70-E
Servo Release Check Valve Kit
Orifice "A"
Part No.
77701-076
Valve
• Valve • O-Ring Patent No. 5,536,221
O-Ring Groove
WARNING: Must be used with properly functioning OE capsule.
O-Ring
WARNING
1. D etermine Servo Application a. Sonnax servo release check valve comes ready to install in units with OE servos with casting numbers 8642554, 8642553 and 24229159. If casting number on inner recess of servo piston housing is missing or illegible, measure to determine which servo is in use (Figure 1). b. Servos with part number 8642093 and Sonnax servos 77701-04K and 77911-03K (Figure 1) have greater volume and require more oil flow. When using these servos, orifice "A" on Sonnax check valve should be enlarged to .120 – .125" using a #31 drill bit (main picture). Ensure debris is cleared from valve after enlargement.
NOTE: Drill carefully; too large an orifice will cause 2-3 flares or bump shifts.
4L70-E
b. Install Sonnax check valve into same bore as OE capsule, tapered end first (Figures 3 & 4, page 2).
Figure 1
4L60/E 2nd Gear Servo Apply Area Common V6-V8
3. Installation & Assembly a. Ensure OE 3rd accumulator checkball capsule is installed and seals without leaks or seepage.
CAUTION
Smallest OE Apply Area 4cyl-V6
2. Spacer Plate Modification a. For normal use, NO plate modification is necessary; proceed to step 3 "Installation & Assembly". b. For moderate performance applications, enlarge appropriate orifice to .090" using #43 drill bit (Figure 2, page 2). c. For maximum performance applications, enlarge appropriate orifice to .100" using #39 drill bit (Figure 2, page 2).
Largest OE Apply Area Camaro & Corvette
17% Larger than Corvette Apply Area
NOTE: Bore variation is common. Install Sonnax check valve without O-ring; if valve slides in without resistance, remove valve. Install Sonnax O-ring, lubricate and roll on clean bench to size O-ring into groove, then reinstall. O-ring ensures good hydraulic seal in cases with enlarged bores.
c. Installed valve should be slightly below flush to avoid spacer plate interference and damage.
2.523
2.312
2.075
1.792
1.310
Casting # 8642554
Casting # 8642553
Casting # 24229159
Casting # 8642093 Sonnax P/N 77701-04K
Sonnax P/N 77911-03K
©2016 Sonnax Industries, Inc. 800-843-2600 • 802-463-9722 • F: 802-463-4059 • www.sonnax.com
NOTE: If check valve requires removal for any reason, a #5 easy-out can be used or the valve can be tapped and removed with bolt and puller.
77701-076-IN 05-13-16 Page 1
T R A N S M IS S ION PART S Instructions
SERVO RELEASE CHECK VALVE KIT 77701-076
4L60 Spacer Plate
4L60-E Spacer Plate
• For normal use: NO plate modification is necessary.
Figure 2
• For maximum performance applications: Enlarge noted orifice to .100" using #39 drill bit.
• For moderate performance applications: Enlarge noted orifice to .090" using #43 drill bit.
4L60-E Transmission Case
Figure 3
4L60 Transmission Case
Figure 4
Check Valve with O-Ring
Check Valve with O-Ring
Figure 5
Ex.
Ex.
Use OE 3rd accumulator capsule. Sonnax 77701-076 Servo Release Check Valve Install Sonnax check valve into bore over OE capsule. Installation Location Transparent View ©2016 Sonnax Industries, Inc. 800-843-2600 • 802-463-9722 • F: 802-463-4059 • www.sonnax.com
Figure 6 #7 OE 3rd Accumulator Capsule
Sonnax 77701-076 Servo Release Check Valve Ex. 2nd Apply Pressure
4th Apply Pressure
3rd Accumulator/3-4 Clutch Apply Pressure
2-4 Servo Assembly Cross Section 77701-076-IN 05-13-16 Page 2
