3526-40A – Weld Yokes – 1350 Series – Butt Dia 3.757″ – Tube Dia Wall 4.000X0.125

Performance Upgrade Context: Moving from a steel 1350-series shaft to an aluminum 1350-series assembly (e.g., replacing a 3-28-427 steel weld yoke with this 3526-40A aluminum version at the same tube spec) typically reduces rotating shaft mass by 25--35%. The reduction in rotational inertia allows the engine to rev more freely and reduces the harmonic load on the tailshaft seal and transmission output bearing -- benefits that are most noticeable in drag racing and track performance applications.

The 3526-40A is the standard aluminum 1350-series weld yoke for 4.000"x0.125" tube applications. The 3.757" butt diameter is the standard for all 4.000"x0.125" tube yokes across 1350, 1410, and 1480 series. The 1.750" CL-to-weld is the shortest in the aluminum 4.000" 1350 family -- compare to the 3526-405A (2.375" CL) for a longer variant. Aluminum welding procedure applies; use proper oxide removal technique and allow complete cooling before joint installation. The 1350 U-joint at 1.188" cap is required; do not substitute a 1410 joint in the yoke ear bores.