Input shaft failure is a common problem in performance GM 4L80-E and 4L85-E transmissions running with extreme horsepower. OE and aftermarket shafts simply don’t hold up in these conditions, leading to spline twist and shaft breakage.

Sonnax extreme duty input shaft 34670-02 is manufactured from an exceptionally tough, high-strength Aermet steel alloy with proprietary heat treatment for unrivaled performance and durability. Additional features like an advanced torsional design, plus unique improvements to the spline and sealing ring areas, make this the most durable input shaft available for 4L80-E and 4L85-E units.

This extreme duty shaft is recommended for applications above 1,000HP.

• Heat-treated Aermet steel outperforms all other shaft materials in strength and toughness
• Hobbed O.D. carrier spline eliminates deep undercut where other shafts fail
• Advanced torsional design with spline, seal ring groove and cross-hole refinements deliver additional strength