34006 SPB IN

2019-02-11

: Sonnax 34006-Spb-In 34006-SPB-IN 4686 instructions part uploads

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PERFORMANCE
H I GH PE R FOR MANCE TRANSMISSIO N PARTS
Instructions

GM 400, 4L80-E, 4L85-E

Heavy Duty Case
Bushing Kit

Shims

Part No.

34006-SPB

• Bushing
• Thrust Bearing
• Shim (2)
• Shim (2)

.010"

Bushing

.015"

Thrust Bearing

1. Disassembly
a. Remove OE case bushing from the transmission case. Check the
case bore for burrs, deburr the leading (inward) edge as needed.
	NOTE: If the OE bushing has spun, measure the case bore. For an ideal
fit, the bore should measure between Ø2.1245–2.1255".

2. Assembly
a. Press Sonnax no-walk bushing into the case bore from inside the
transmission so bushing flange is seated on the transmission case.
b. Two .010" and two .015" Sonnax shims are included to set the rear
unit endplay in accordance with OE specifications. These shims
allow adjustment in .005" increments covering the common range
of OE selective washers. Install the required combination of selective
shims around the bushing’s flange and against the face of the case.

Figure 1

OE Output
Shaft
Proper Orientation
of Thrust Bearing

Rear End Play Specifications:

Thrust
Bearing

• 4L80-E .005–.025"

Shims

• TH400 .007–.019"
c. Install Sonnax thrust bearing around the bushing’s flange and
against the shims in proper orientation (Figure 1).
	NOTE: On some applications, the output shaft may be snug during reassembly. Tap on the shaft at spline area to re-form the bushing high spots.

©2019 Sonnax Transmission Company, Inc. • A Marmon / Berkshire Hathaway Company
800-843-2600 • 802-463-9722 • F: 802-463-4059 • www.sonnax.com

Bushing

OE Case

34006-SPB-IN

02-07-19
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