The Broken Piston
The General Motors 6L80 and 6L90 platforms commonly see cracked 1-2-3-4 apply pistons. This stress fractured piston is often due to the cantilevered stress on the cast material. This problem becomes even more prominent with customers who have had aftermarket tuning/modifications performed to increase line pressure in the transmission.
The OE part from GM has seen several revisions in attempts to correct this, but despite this, the piston still suffers from a very high failure rate.
This new Sonnax 1-2-3-4 Billet Apply Piston corrects this issue. This new 6L80/6L90 Apply Piston is manufactured from much stronger billet aluminum and utilizes a superior design. These improvements in design refinements add additional strength to prevent failure and improve performance.
This piston is a must on modified vehicles with this transmission.
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