34006 SPB IN

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

Heavy Duty Case

Bushing Kit

Part No.

34006-SPB

• Bushing

• Thrust Bearing

• Shim (2) .010"

• Shim (2) .015"

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

t, 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 ange 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 specications. ese 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 ange and against the face of the case.

Rear End Play Specications:

• 4L80-E .005–.025"

• TH400 .007–.019"

c. Install Sonnax thrust bearing around the bushing’s ange and

against the shims in proper orientation (Figure 1).

NOTE: On some applications, the output shaft may be snug during re-

assembly. Tap on the shaft at spline area to re-form the bushing high spots.

OE Output

Shaft

OE Case

Shims

Bushing

Thrust Bearing

Figure 1

Shims

Bushing

Thrust

Bearing

Proper Orientation

of Thrust Bearing

©2019 Sonnax Transmission Company, Inc. • A Marmon / Berkshire Hathaway Company 34006-SPB-IN 02-07-19

800-843-2600 • 802-463-9722 • F: 802-463-4059 • www.sonnax.com

Instructions

HIGH PERFORMANCE TRANSMISSION PARTS

PERFORMANCE