Main shaft failure is a common problem in performance and heavy duty GM TH400, 4L80-E and 4L85-E units. Sonnax heavy duty main shaft 34672-01 is manufactured from high strength 300M with proprietary heat treatment and post heat treat processing for exceptional performance, durability and value. This shaft is recommended for applications up to 1,000HP. For extreme horsepower applications, see Sonnax extreme duty main shaft 34672-05 — the most durable 1” main shaft available.

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

More From This Category

Motive Gear Differential Master Bearing Kit, Koyo, For Ford EXPEDITION 1997–1999, Kit

Motive Gear Differential Master Bearing Kit, Koyo, For Ford EXPEDITION 1997–1999, Kit

$461.53

MANLEY Connecting Rod Pin Bushing, Bronze, 1.100 in. OD, 1.033 in. ID, 1.175 in. Length, Set of 8

MANLEY Connecting Rod Pin Bushing, Bronze, 1.100 in. OD, 1.033 in. ID, 1.175 in. Length, Set of 8

$182.30

MANLEY Connecting Rod Pin Bushing, Bronze, 1.424 in. OD, 1.309 in. ID, 1.167 in. Length, Each

MANLEY Connecting Rod Pin Bushing, Bronze, 1.424 in. OD, 1.309 in. ID, 1.167 in. Length, Each

$22.80