Symptoms:

  • B2 Clutch burned
  • Delayed Reverse
  • No Reverse
  • Reverse slip

Cause:

Oscillation of the steel B2 apply control valve train prematurely wears the cast-aluminum bore, allowing regulated reverse clutch apply pressure to exhaust to the sump or cross leak to adjacent circuits.

Correction:

Restore proper hydraulic control by reconditioning the bore and replacing the worn valve train with the Sonnax oversized B2 apply control valve kit.

U660E, U660F, U760E, U760F

Oversized B2 Apply Control Valve Kit
Part No. 47740-27K


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

Toyota/Lexus U660E/F and U760E/F transmissions may exhibit delayed/slipping Reverse or no Reverse operation at all due to wear in the B2 apply control bore. The B2 apply control valve train regulates reverse clutch apply and release. If reverse slippage is not corrected in time, burnt B2 clutches can result. Sonnax oversized B2 apply control valve kit 47740-27K restores the necessary hydraulic clearances required for proper valve function, eliminating reverse apply issues.

  • Hardcoat anodized aluminum valves combat premature wear
  • Future side-load wear is decreased by addition of annular grooves, which help center valves in bore
  • Proper reverse operation depends on a correctly functioning B2 accumulator; if problems are found with B2 accumulator piston or bore, Sonnax offers B2 accumulator piston kit 47740-11K

Spring included in this kit is used in all U660E/F and U760E applications regardless of OE spring color.

  • Spring
  • End Plug
  • Inboard Valve Three-Spool
  • Outboard Valve Four-Spool

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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Toyota/Lexus U760E/F Vacuum Test Guide

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  • 47740 27k combo
  • 47740 27k

You need this if...

Vacuum tests at the ports indicated fail to hold a minimum of 14 in-Hg.

  • 47740 27k in test