• Poor shift quality
  • Burnt clutches
  • Delayed engagement
  • TCC apply & release concerns
  • Low line pressure
  • Loss of shift solenoid control pressure


Bore and/or piston wear in the solenoid dampers can allow for variation or loss of the fluid flow pressure between the control solenoids and the related valves and clutches.


Sonnax drop-in solenoid damper kit corrects these circuit pressure variations by remedying bore/damper wear without the need of modifying the valve body.

UA80E, UA80F, UB80E, UB80F

Solenoid Damper Kit
Part No. 168740-12K

Fits one of eight locations.

You need this if... View Instructions Find a Distributor

Solenoid dampers are used in Toyota/Lexus UA80E/F & UB80E/F series transmissions to dampen or smooth out the signal fluid pressure applied from each control solenoid before the fluid flows to their respective valves and clutches. These components help provide a smooth operation of the transmission by removing the pressure spikes.

When the bore and/or pistons wear out, they cannot effectively dampen the variation in pressure and can potentially exhaust fluid pressure. This can result in loss of shift control pressure, delayed engagement, poor shift quality, burnt clutches and TCC apply and release concerns.

Replacing these worn out dampers can require replacing the solenoid body or the entire control valve body.

Sonnax solenoid damper kit 168740-12K returns the correct system pressure by providing a replacement piston with a positive sealing O-ring to address even worn bores.

  • Carburized steel pistons combat premature wear
  • Annular groove added to reduce wear rate
  • O-Ring provides positive seal to prevent critical pressure leakage in already worn bores
  • Mating springs to re-establish OE dampening action
  • Drop-in Zip Valve™ parts install quickly and easily
Learn More About Zip Valve™ Drop-In Repairs
  • Piston
  • O-Rings (2) 1 Extra
  • Spring Small
  • Spring Large

Sonnax valve body layouts provide a detailed overview of individual units making it quick and easy to determine what’s available for the specific valve body you’re working on. See all Sonnax valve body layouts.

Toyota/Lexus UA80E/F, UB80E/F Valve Body Layout

Toyota/Lexus UA80E/F, UB80E/F Valve Body Layout
  • UA80E, UA80F, UB80E, UB80F Solenoid Damper Kit 168740-12K
  • UA80E, UA80F, UB80E, UB80F Solenoid Damper Kit 168740-12K

You need this if...

Vacuum testing at the port(s) indicated fails to hold the recommended minimum in-Hg, or if wear is visually detected.

UA80E, UA80F, UB80E, UB80F Solenoid Damper Kit Vacuum Test Locations