Sonnax has released new drop-in C1 and C4 apply boost valve kits (part numbers 168740-01K and #168740-02K, respectively) for Toyota’s UA80E, UA80F, UB80E and UB80F transmissions. The sleeves in these kits are manufactured from wear-resistant billet aluminum. Sonnax says these kits can prevent wear and restore proper hydraulic control in these Toyota/Lexus transmissions.
