The end plugs at the kick downshift control, manual low, and throttle downshift control valves become loose. This allows solenoid feed oil to exhaust and drop below 40-45 psi, which prevents the shift valves from stroking fully. Sonnax O-ringed end plug and checkball kit 37947-13K contains O-ringed end plugs for these three locations, which positively seal the circuit to prevent oil loss.

O-Ringed end plugs positively seal the circuit to prevent oil loss
End plugs have threaded ends for ease of installation and removal
Kit contains 4 Torlon® checkballs to replace lost or damaged originals
Kit contains 4 L-shaped retainer pins to replace lost originals
Drop-in Zip Valve™ parts install quickly and easily

Learn More About Zip Valve™ Drop-In Repairs

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