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

More From This Category

Proflow Adaptor Fitting Plug -10AN, Black

Proflow Adaptor Fitting Plug -10AN, Black

$8.62

Sonnax O-Ringed End Plug Kit, Chrysler, Ch 845Re, ZF8Hp45/55/70, Each

Sonnax O-Ringed End Plug Kit, Chrysler, Ch 845Re, ZF8Hp45/55/70, Each

$57.53

Sonnax O-Ringed End Plug Kit, Ford, Cd4E, La4A-El, Each

Sonnax O-Ringed End Plug Kit, Ford, Cd4E, La4A-El, Each

$7.99