Sonnax GM 4L30-E Transmission

Pump

Boost Valve Kit 54200-06K

Large ratio, OE code 264

Helps cure:

Low line pressure
Burnt clutches
Soft upshifts
Delayed Reverse

Boost Valve Kit 54200-14K

Small to medium ratio, OE code 067

Helps cure:

Low line pressure
Burnt clutches
Soft upshifts
Delayed Reverse

Boost Valve Kit 54200-01K

Medium ratio, OE code 448

Helps cure:

Low line pressure
Burnt clutches
Soft upshifts
Delayed Reverse

TCC Regulator Valve Sleeve 54754-02

'00-Later, PWM Style

Helps cure:

Code 894, 1870
TCC slip

Thrust Washer & Shim Kit 54701-03K

3-Tab Fits pump & stator support

Material: Bimetal
Tab Count: 3
Outer Dia.: 2.500"
Inner Dia.: 1.740"
Thickness: 0.074"

Helps cure:

Damaged washers
Excess endplay

Valve Body

Oversized Accumulator Pin Kit 54250-05K

Helps cure:

Burnt clutches & bands
Leakage at the accumulator pin bore

Tooling:

54250-04K

Case

Bell Housing Bushing 54253-01

Bell Housing

Bushing Style: Precision
Material: Steel-backed aluminum
Width: 0.560"
Shaft Dia.: 1.874"
Housing Bore: 2.003"

Helps cure:

Leaking front seal
Bushing wear

Servo/Band

Servo Pin Bore Sleeve 76890-24K

Helps cure:

2nd Clutch burned (GM)
Burnt band (GM)
3rd Clutch burned
2-3 Flare

Tooling:

S-76890-TL24
SERVO-FIX

Other

Tool Kit S-76890-TL24

Tooling:

SERVO-FIX

Tech Resources

May 19, 2006

SonnaFlow® Chart: 4L30-E (Normal)

September 16, 2005

GM TCC Circuits

Maura Stafford

November 15, 2004

4L30-E Slips in 2nd or Slips in 3rd

Ed Lee

September 15, 2003

Beyond 1870: GM Converter Codes P0741, P0742 and 1887

Gregg Nader