In high-horsepower 6R80 builds, the main shaft is another critical failure point — and here’s why: from the factory, it’s actually two separate pieces welded together, known as the main shaft and hub assembly. While that’s fine for stock power levels, once you add serious torque, wheel hop, or hard shifts, the OEM construction just can’t keep up.

That’s where Bluestreak Performance steps in with a smart and durable solution. Starting with a brand-new OEM assembly, Bluestreak removes the factory shaft and welds in a high-strength replacement designed to take the abuse. The result? A seamless, power-hungry upgrade that slots in as a direct OEM replacement, no machining required.

Whether you’re launching hard at the track or building a street monster that needs to stay together under pressure, this upgrade brings the durability your 6R80 needs to go the distance.

Why It’s Worth the Swap:

  • Replaces the factory 2-piece welded main shaft with a stronger, upgraded unit

  • Built using a new OEM hub with a welded high-strength shaft

  • Handles extreme load, torque spikes, and aggressive shifts

  • Direct fit — no machining or tuning required

  • Ideal for high-horsepower street, strip, and competition builds

  • A key part of leveling up even beyond entry-level 6R80 upgrades

Works on all 2015-2017 Mustang 6R80 transmissions