Magnum heavy duty Chev Small block 283-327 TH300 TH400 POWERGLIDE

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MRC Magnum heavy duty Chev Small block 283-327 TH300 TH400 POWERGLIDE

Chev Small block heavy duty Flexplate

Chev small block 283-327 engines will fit turbo 350/400 and Powerglide transmissions.


This plate is  0.0050" thicker than the standard 153T-327 plate and is suitable for heavy-duty applications.

Signs you have a cracked flex plate:

  • The flex plate makes a loud knocking noise as it rotates (very similar to a bent engine rod)

  • Severe vibration

  • Motor won’t turn over

  • Loss of drive

A cracked flex plate is usually a sign of other problems. If you replace the flex plate and don’t fix the real problem your flex plate will most likely crack again. Installing a heavier duty flex plate will normally pass the problem on to the transmission.

Flexplates can absorb the minute misalignment between the engine and the transmission. But, as misalignment increases, the flex plate flexes more and eventually, this causes the metal to fatigue and the flex plate cracks. To avoid this, misalignment should be less than 0.2 mm

Slight misalignment may only cause a single flex plate to break in the life of the vehicle.  More severe misalignment can break a flex plate in 24,000 to 48,000 km.  

Other things that can cause a flex plate to crack include:

  • Missing or improperly tightened bolts/dowel pins

  • Foreign objects caught between the engine and transmission e.g. wires

  • Excessive crankshaft flange or end plate run-out

  • A damaged engine, transmission or torque converter

  • Hydraulic locking causing a damaged crankshaft

The same things that cause the flex plate to crack can also cause transmission problems. Damaged and leaking front seals and front transmission pumps are common symptoms.

For brand new, Australian-made, quality flex plates that are competitively priced with free postage, you can’t go past MRC Performance!



SKU 153T-327HD
Brand Magnum
Shipping Weight 5.0000kg

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