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Sonnax Heavy-Duty Main Shafts

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Main shaft failure is a common problem in performance and heavy-duty GM TH400, 4L80-E and 4L85-E units. Sonnax replacement heavy-duty main shafts are manufactured from high-strength 300M with proprietary heat treatment and post heat-treat processing for exceptional performance, durability and value. These shafts are recommended for applications up to 1,000 hp.

Additional details:

* Advanced torsional design with spline and cross hole refinements for additional strength
* Direct replacement for OE shafts

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Sonnax Heavy-Duty Main Shafts 34672-01

4L80E INTERMEDIATE / MAIN SHAFT / 300M

Part Number: SOX-34672-01

Not Yet Reviewed

Estimated Ship Date: Monday 4/27/2026 if shipped by air

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Estimated Ship Date: Monday 4/27/2026 if shipped by air

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