When it comes to 6R80 failures, fourth gear is where the weak link often shows — and that’s exactly where the intermediate shaft comes into play. Factory shafts work fine at stock power levels, but once you’re making 600+ rwhp, the stock piece becomes a liability. That’s where PBH steps in.

Our upgraded Billet Intermediate Shaft is made from high-strength 300M steel, built to handle the abuse that high-horsepower cars dish out — especially during heavy 4th gear loads. It’s a direct replacement for the OEM unit, with no machining or modification needed.

You’ll find this shaft not only in our Stage One 6R80 builds but also in every high-end PBH-built transmission we offer. It’s tried, tested, and trusted by racers and builders pushing their cars past the limits of stock.

Why it matters:

  • Designed to withstand high torque in 4th gear where stock shafts typically fail

  • Made from premium 300M steel for extreme durability

  • Direct OEM replacement — no machining required

  • Standard in all PBH-built Stage 1 and higher 6R80 transmissions

  • Also included in PBH rebuild kits

  • PBH Part #: TR-2018

Works on all 2015-2017 Mustang 6R80 transmissions