1965–1968 Mustang Flexplate – 50 oz. Imbalance, 157 Tooth, TRA-658-712, Custom

TRA-658-712 | Custom 50oz 157-Tooth Flexplate for 1965–1968 Mustang – Late Model 5.0L to Early C4 Transmission

The TRA-658-712 is a custom-engineered flexplate designed specifically for adapting a 1982-1995 Ford 5.0L / 302 engine to an early small-bellhousing C4 automatic transmission in 1965–1968 Ford Mustangs and other classic Ford applications. Featuring the correct 157-tooth ring gear, 50oz imbalance, and proper flexplate thickness, it eliminates the alignment and engagement issues commonly encountered when using many off-the-shelf flexplates in 5.0L-to-C4 conversions.

Unlike many flexplates on the market for this application, the TRA-658-712 is manufactured to the correct thickness for proper starter and torque converter alignment, helping prevent fitment issues that can occur during engine swap installations.

Key Features:

• Correct 50oz imbalance for 1982-1995 Ford 5.0L / 302 engines

• 157-tooth ring gear for clean starter engagement

• Custom thickness prevents interference issues common with other flexplates

• Custom-engineered by California Pony Cars for late-model 5.0L to early C4 transmission conversions

• Ideal for restomods, classic restorations, and street performance builds

Compatibility:

• Fits 1965–1968 Ford Mustang (and other Ford cars/trucks) with:

  • 1982-1995 Ford 5.0L / 302 engine

  • C4 3-speed automatic transmission

• Not compatible with manual transmissions or engines requiring 28oz imbalance

Fitment Notes:

• C4 transmissions used two bellhousing sizes:

  • Small bellhousing = 157-tooth (this flexplate)

  • Large bellhousing = requires 164-tooth flexplate

• Confirm the following before purchase:

  • Tooth count: 157

  • Engine imbalance: 50oz

  • Torque converter bolt pattern: 10.5"

  • Bellhousing type: small-case C4 157 tooth
    

Package Includes:

• (1) TRA-658-712 custom flexplate

Installation Notes:

• Professional installation strongly recommended

• This custom-engineered flexplate was designed specifically for late-model 5.0L to early C4 transmission conversions and is not a universal off-the-shelf replacement.