50 oz Automatic Flexplate, 164 Tooth, 73-77 Ford Bronco (Late Motor) SKU: 8399

Early Bronco C4 Automatic Flexplate | 50 oz Balance | 164 Tooth

If you're swapping your engine for a late-model Ford 5.0 and plan on running the stock C4 automatic transmission, this 164-tooth flexplate is what you need for proper balance. Designed for 1966–77 Ford Broncos running a C4 auto, this flexplate (also referred to as an automatic flywheel) is built to handle the torque and hold up to daily driving or trail abuse. Just make sure your torque converter has the 11-3/8" bolt pattern—some early Broncos used a smaller 10.5" version. This is the large-pattern version.

Why you need this: Original small block Ford motors found in 66-77 Broncos had a 28 ounce imbalance. If you try to run the flywheel from this setup with your 1981 & newer Ford 5.0L, you'll have a nasty shake and can cause damage to the engine and transmission. This 50 ounce balance flexplate solves this dilemma.

• For 50 oz Balanced Engines: Specifically for 1981+ 302/5.0L Ford small blocks with 50 oz imbalance.

• C4 Transmission Ready: Works with the Ford C4 automatic commonly used in 66–77 Broncos.

• 164 Tooth Count: Fits starters and bellhousings designed for 164-tooth flexplates.

• Large Bolt Pattern: Requires torque converters with 11-3/8" mounting pattern (verify before ordering).

• Solid Construction: Built to OEM specs for reliable performance in off-road and street builds.

• Perfect for Engine Swaps: Ideal for modern 5.0L EFI swaps into classic Bronco platforms.

• Not for 28 oz Engines: Will NOT work with pre-1981 302s or any 351W, which require 28 oz imbalance.

50 oz, 164-tooth C4 flexplate for late-model 5.0L swaps. If you are unsure whether you have a 28 ounce or 50 ounce imbalance motor, check the numbers on your engine block and refer to your local engine shop or give us a call.