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 to adapt a late-model 5.0L / 302 engine to an early C4 automatic transmission in 1965–1968 Ford Mustangs and other classic Ford vehicles. It features a 157-tooth ring gear and 50oz imbalance, precision-balanced for reliable performance in engine swaps and restomod builds.
Unlike most flexplates on the market for this application, the TRA-658-712 is built to the correct thickness—many other flexplates are known to be too thick, causing alignment and engagement issues in 5.0L to C4 setups.
Key Features:
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Correct 50 oz imbalance for late-model 302/5.0L engines (1981-up)
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157-tooth ring gear for clean starter engagement
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Custom thickness prevents interference issues common with other flexplates
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Manufactured by California Pony Cars to exact fitment standards
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Ideal for restomods, classic restorations, and street performance builds
Compatibility:
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Fits 1965–1968 Ford Mustang (and other Ford cars/trucks) with:
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Late-model 5.0L / 302 engine
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C4 3-speed automatic transmission
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Not compatible with manual transmissions or engines requiring 28oz imbalance
Fitment Notes:
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C4 transmissions used two bellhousing sizes:
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Small bellhousing = 157-tooth (this flexplate)
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Large bellhousing = requires 164-tooth flexplate
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Confirm the following before purchase:
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Tooth count: 157
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Engine imbalance: 50oz
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Torque converter bolt pattern: 10.5"
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Bellhousing type: small-case C4 157 tooth
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Package Includes:
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(1) TRA-658-712 custom flexplate
Installation Notes:
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Professional installation strongly recommended
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This is a custom-fit component, not a standard off-the-shelf part
