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Symptoms:

  • No lockup
  • Code 894, 1870
  • Falls out of lockup when hot
  • Fluid blown out fill tube
  • Lockup immediately after 2nd gear

Cause:

Excessive pump bore-to-valve clearance allows TCC signal oil to leak past the spool, preventing lockup or causing lockup to disengage when hot. Additionally, converter feed can leak past the excessive clearance, combine with signal oil and cause premature lockup.

Correction:

These improved TCC apply valves with PTFE seals will eliminate bore cross leakage.

Warning:

This part only fits PWM units, and mismatching PWM and non-PWM valves will cause rapid converter failure.

Identifying PWM vs. Non-PWM Units
If the OE valve features one spool at the location indicated here, you are working on a PWM unit. If the OE valve features double spools, you are working on a non-PWM unit and must use Sonnax TCC apply valve kit 77805-K (not included). Do not rely on the OE valve material (steel vs. aluminum) to determine for whether the unit is PWM, as some early PWM pumps used steel TCC valves like the non-PWM pumps.

4L60-E, 4L65-E, 4L70-E

TCC Apply Valve Kit
Part No. 77805E-K

Fits PWM units only.

  • Updated stroke pressure eliminates TCC drift on apply and updated exhaust control
  • PTFE seal eliminates cross leaking of converter signal oil and converter feed oil
  • Sonnax kit works in both early- and late-style PWM pumps when used with included spring
Found In:
Buick Roadmaster, Wagon 1994-1996 V8 5.7L 4SPD RWD
Rainier 2004-2007 L6 4.2L V8 5.3L 4SPD RWD AWD
Hummer (H3) (H3T) 2006-2010 L5 3.7L 4SPD RWD 4x4
Hummer (H3) (H3T) 2008-2010 V8 5.3L 4SPD RWD 4x4
Cadillac Fleetwood, Brougham 1993-1996 V8 4.9L 5.7L 4SPD RWD
Escalade ESV EXT 1999-2007 V8 5.3L 5.7L 6.0L 4SPD RWD AWD
Cadillac Limo 1993-1996 V8 4.9L 5.7L 4SPD RWD
Chevrolet Astro Van Safari 1995-2007 V6 4.3L 4SPD RWD 4x4
Avalanche 2001-2007 V8 5.3L 4SPD RWD 4x4
Envoy Trailblazer 1993-2009 L4 2.2L V6 4.2L 4.3L 4SPD RWD 4x4
Envoy Trailblazer 1993-2009 V8 5.3L 4SPD RWD 4x4
Camaro 1994-2002 V6 3.4L 3.8L 4SPD RWD
Camaro 1994-2002 V8 5.0L 5.7L 4SPD RWD
Caprice, Wagon 1993-1996 V6 4.3L V8 5.0L 5.7L 4SPD RWD
Blazer Jimmy 1993-2007 L4 2.2L V6 4.2L 4.3L 4SPD RWD 4x4
Blazer Jimmy 1993-2007 V8 5.3L 4SPD RWD 4x4
Colorado Canyon 2004-2006 L4 2.8L L5 3.5L 4SPD RWD 4x4
Colorado Canyon 2007-2011 L4 2.9L L5 3.7L 4SPD RWD 4x4
Corvette 1993-2005 V8 5.7L 6.0L 4SPD RWD
Express Savana 1500-2500 1996-2011 V6 4.3L V8 4.8L 5.3L 5.7L 4SPD RWD 4x4
S10 S15 Jimmy Sonoma 1993-2004 L4 2.5L V6 4.3L 4SPD RWD 4x4
Silverado Sierra 1500-3500 1995-2010 V6 4.2L 4.3L 5.4L 5.7L 6.0L V8 
Impala 1994-1999 V8 5.7L 4SPD RWD
4.8L 5.0L 5.3L 4SPD RWD 4x4
Suburban 1500-2500 1993-2008 V8 4.8L 5.0L 5.3L 5.7L 4SPD RWD 4x4
Tahoe Yukon 1993-2009 V8 4.8L 5.0L 5.3L 5.7L 4SPD RWD 4x4
Isuzu Ascender 2003-2009 L6 4.2L V8 5.3L 5.4L 4SPD RWD 4x4
Hombre 1997-2000 L4 2.2L V6 4.3L 4SPD RWD 4x4
Oldsmobile Bravada 1993-2004 L6 4.2L V6 4.3L 4SPD RWD 4x4
Pontiac Firebird 1994-2002 V6 3.4L 3.8L V8 5.7L 4SPD RWD
GTO 2004-2007 V8 5.7L 6.0L 4SPD RWD
Saab 9-7 9-7X 2005-2009 L6 4.2L V8 5.3L 4SPD AWD
I280 2006 L4 2.8L 4SPD RWD
I290 2007-2009 L4 2.9L 4SPD RWD
I350 2006 L5 3.5L 4SPD RWD 4x4
I370 2007-2009 L5 3.5L 4SPD RWD 4x4
  • Valve Aluminum
  • Seal PTFE
  • Spring

._Thank you for looking!