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Symptoms:

  • Delayed Reverse
  • Low line rise in Reverse
  • B2 Brake clutches burned

Cause:

These complaints can be caused by wear of the reverse boost valve sleeve, allowing line pressure to escape to exhaust.

Correction:

This Sonnax reverse boost valve kit has upgraded materials and tighter clearances to prevent wear and restore proper hydraulic control.

U660E, U660F

Reverse Boost Valve Kit
Part No. 47740-17K

You need this if... View Instructions

Vehicles with Toyota/Lexus U660E, U660F transmissions may exhibit insufficient line rise in reverse gear, delayed reverse engagement and/or a burned B2 brake. These problems may be caused by continuous oscillation of the steel boost valve within the cast aluminum boost sleeve, creating excessive wear and a path for line pressure to either leak to exhaust or leak to the EPC boost circuit and create high line pressure conditions.

Sonnax reverse boost valve kit 47740-17K has upgraded materials and minimal clearances to prevent wear and restore proper hydraulic control.

  • Sleeve is manufactured from highly wear-resistant billet aluminum to prevent excessive wear
  • Restores proper line rise
  • Valve
  • Sleeve

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 U660E/F, U760E/F Valve Body Layout

U660ef vbl thumb

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  • 47740 17k
  • 47740 17k main

You need this if...

A vacuum test at the port indicated fails to hold at least 18 in-Hg.

  • 47740 17k test