Part Summar y
tra n s m is s ion P art s
Complaints
TCC slip under load
No line rise during
TCC apply in 4th
Overheated converter
Loss of TCC apply or
cycling RPM
Elevated line pressure
with no indication of boost
Loss of lubrication
Cause
Correction
Excess boost valve bore wear
reduces oil pressure to the switch
valve, resulting in a partial stroke
position, restricting the converter
and lube circuits.
The Sonnax oversized lockup boost valve
restores the proper pressures to the switch
valve and main regulator valve, ensuring
proper flow through the converter and lube
circuit and correcting line pressure.
Chrysler 42-46-47-48RH/RE
Oversized Lockup
Boost Valve Kit
TOOL
EQ
Oversized
Plug Valve
Part No.
UIRE
22771-19K
Oversized Lockup
Boost Valve
Oversized Lockup Boost Valve
Oversized Plug Valve
Spring
Spring Retainer
Note: Fits 90-later with boost oil
delivery tube.
Spring
Tool Kit
Tool Kit
Spring
Retainer
Part No.
F-22771-TL19
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.
Chrysler 42-46-47-48RH/RE transmissions are equipped with a lockup boost valve that is
prone to wear. When this valve wears, it causes a loss of converter and lubrication flow, which
can result in TCC slip and an overheated converter. Lockup boost valve wear also causes
excessive line pressure, and line rise during TCC apply or in 4th gear can be lost. Sonnax
offers an oversized lockup valve boost kit, 22771-19K, that restores the lockup boost circuit
pressures. The lockup boost valve kit will correct TCC apply, lubrication and overheat problems, as well as maintain proper line pressure.
Features & Benefits
Both valves are hard-coat anodized
aluminum to resist wear
The Sonnax spring is calibrated to match
OE pressure with the oversized valves
Visually inspect for
wear here; first and
last bore diameter.
You need this if
A visual inspection reveals wear, especially at
the inboard end and valve plug end. Inspect
and vacuum test as shown in illustration.
Check for leaks here.
20
15
10
25
0
30
VACUUM
TEST
Vacuum Test Here
2011 Sonnax Industries, Inc.
800-843-2600 802-463-9722 F: 802-463-4059 www.sonnax.com
22771-19K10-18-11
