Technical Service Bulletins

Ticking Express

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Ticking Express

This bulletin applies to 2012-2013 Chevy Express vans equipped with the 4L60E automatic transmission. On vehicles manufactured prior to Jan. 15, 2013, some customers may comment about a ticking noise when driving above 30 mph in third and fourth gear.

The noise is present with the TCC engaged or disengaged and may be present in second gear under certain driving conditions. This concern may be caused by a mis-machined reaction carrier which may cause the low reverse clutch plates to stick and release, creating the ticking noise. The reaction carrier may have an out-of-round condition due to being mis-machined.

Replace the reaction carrier, low and reverse roller clutch race, low and reverse roller clutch and the low and reverse clutch plates.

Part number              Item

24241237…………….Reaction carrier



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