104520 07K IN

104520-07K-In 104520-07K-IN 104520-07K-IN 3070 instructions part uploads sonnax-dev

2015-03-17

: Sonnax 104520-07K-In 104520-07K-IN 1821 file instruction uploads

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T R A N S M IS S ION PART S
Instructions

GM 6L45, 6L50, 6L80, 6L90

Oversized Pressure
Regulator & Boost
Valve Kit

Tool
Kit

Part No.

R

EQ

D

TOOL

UIRE

104520-07K

•	Pressure Regulator Valve
•	Matching Outer Spring
•	Boost Valve
•	Boost Sleeve
•	Checkballs (2)
•	Drill Bit

6L80
Pump Cover
Drill Bit
Pressure
Regulator Valve
Matching
Outer Spring

Checkball

OE Boost
Valve Spring

1 Extra

Boost Valve
Boost Sleeve

Tool Kit

OE Retaining
Pin

Part No.

F-104520-TL7C

•	Reamer
•	Reamer Jig
•	Guide Pin
NOTE: Sonnax “F-Tool” kits designed to
service a specific bore require the VB-FIX,
a self-aligning valve body reaming fixture.
More information and instructions can be
found online at www.sonnax.com.

Required

Oversized Pump
Base Plate
VB-06
NOTE: Use of the VB-06 is required with
the VB-FIX reaming fixture for this installation unless the stator support shaft is
removed from the pump body.

NOTE: In GM 6L45, 6L50, 6L80 and 6L90 units the pressure regulator valve and boost
assembly are located in the pump cover. Transmission must be removed from the vehicle to
access pump and replace the pressure regulator valve and boost assembly.

1. Disassembly
a. Remove OE pressure regulator valve train from pump body bore.
b. Save OE retaining pin and boost valve spring for reuse and discard remainder of the
OE valve train.
2. B
 ore Reaming
Ream pressure regulator bore (for reaming instructions/reamer care, please visit
www.sonnax.com). Sonnax reaming tool kit F-104520-TL7C and VB-FIX are
required for this operation.
3. Reroute

Pressure Regulator Balance Feed Passage
a. Locate OE balance feed orificed cup plug and adjacent inboard balance port for the pressure regulator valve.
b. Drop one Sonnax 1/8" aluminum checkball into OE orificed cup plug. Drive checkball into cup plug with appropriately sized punch. Stake cup plug to prevent checkball
displacement (Figure 1).
c. Using included Sonnax drill bit, bore a new orifice from the cup plug bore to inboard
balance port at an approximate 45° angle. Starting drill bit on counter-sunk surface of cup
plug bore works best (Figure 2).
d. Clean bore thoroughly, removing all debris and chips.

©2015 Sonnax Industries, Inc.
800-843-2600 • 802-463-9722 • F: 802-463-4059 • www.sonnax.com

104520-07K-IN 03-16-15
Page 1

T R A N S M IS S ION PART S
Instructions

OVERSIZED PRESSURE REGULATOR & BOOST VALVE KIT 104520-07K, F-104520-TL7C

4. Installation & Assembly
a. Install Sonnax pressure regulator valve.
b. Install Sonnax matching outer spring.
c. Reinstall OE boost valve spring.
d. Install Sonnax boost valve and sleeve.
e. Reinstall OE retaining pin.

Figure 1

Checkball

5. Final Testing
Vacuum testing at the port(s) indicated holds the
recommended minimum 18 in-Hg (Figure 3).

Figure 2
Drill Bit

6L80 Pump
Cover

Figure 3

18"-Hg

20

15

10

25

5

0
30
VACUUM
TEST

6L80 Pump
Cover

©2015 Sonnax Industries, Inc.
800-843-2600 • 802-463-9722 • F: 802-463-4059 • www.sonnax.com

104520-07K-IN 03-16-15
Page 2
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