Extreme strength spline configuration requires use of thrust bearing between forward clutch hub and direct drum that moves support of forward clutch hub from the main shaft to the direct drum/sun gear tube (see instructions Figures 1 & 4).
Main shaft failure is a common problem in extreme duty 400, 4L80-E and 4L85-E units. OE and aftermarket shafts simply don’t hold up in extreme horsepower applications, leading to spline twist and shaft breakage. Sonnax extreme duty main shaft 34672-05 is manufactured from an exceptionally tough high-strength steel alloy with proprietary heat treatment for unrivaled performance and durability. An advanced torsional design with spline and cross hole refinements make this the most durable 1" main shaft available. Sonnax extreme duty main shaft withstood extensive in-vehicle and lab testing with unbroken results run after run.
Can be used to replace late 4L80-E and 4L85-E solid shafts, however, check clearance between front of main shaft and rear of input shaft. It may be necessary to remove approximately .060" from front of main shaft or rear of input shaft.
March 29, 2017
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