Sonnax

34500-Z

Endplay Shim Kit

Hard Parts

It is often difficult to reduce front unit endplay on 400 or 4L80-E units with excessive spline wear. Normal component wear allows excess forward and direct drum travel. This travel or free-play reduces sealing ring life. The 400 and 4L80-E are limited on the thickness of pump shim material that can be added. Excessive shimming at the pump will push the forward drum off the rings and result in a burned forward clutch. Sonnax offers a .010" thick shim, that can be stacked under the sun gear bearing race. By lifting the sun gear, the drums are also supported and front unit endplay is reduced. The shim can be installed between the sun gear thrust bearing and the rear internal gear during lower unit assembly. Updated design fits all model years. Package contains 10 shims

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