Remanufactured Valve Body

Required

400 Remanufactured Valve Body GM025

400
Remanufactured Valve Body GM025

With Reverse Checkball

Sonnax rebuilt valve body GM025 is no longer in production. Please check with your distributor for availability. For service inquiries, please see details on Sonnax’s Limited Lifetime Warranty on remanufactured valve bodies.

Internal
Zip Kits

Bearing Kit SBK-G10

1976-1997

    Helps cure:
  • Bearing noise
  • Bearing failure
Zip Kits

Direct Drum Sleeve Kit 34838-01K

In 4L80-E units, part can be used in either early or late-model drums.

    Helps cure:
  • Direct clutch failure
  • Delayed 3rd
  • Delayed Reverse
  • Code 87, 730, 756, 1811
  • No 3rd
  • No Reverse
  • Maximum line presssure
  • No 4th
  • 2nd Gear starts w/MIL on
  • TCC slip codes
Zip Kits

Forward Clutch Hub Front Washer 34298-078

Forward Hub

  • Material: Steel
  • Thickness: 0.078"
  • Outer Dia.: 1.781"
  • Inner Dia.: 1.289"
    Helps cure:
  • Excess front endplay
Zip Kits

Forward Clutch Hub Washer (Rear) 34301-078

Forward Clutch Drum

  • Material: Steel
  • Thickness: 0.078"
  • Outer Dia.: 1.780"
  • Inner Dia.: 1.405"
    Helps cure:
  • Excess front endplay
  • Forward clutch & sealing ring failure
  • Reduced bearing, thrust washer & sealing ring life
Zip Kits

Forward Clutch Hub Washer (Rear) 34301-094

Forward Clutch Drum

  • Material: Steel
  • Thickness: 0.094"
  • Outer Dia.: 1.780"
  • Inner Dia.: 1.405"
    Helps cure:
  • Excess front endplay
  • Forward clutch & sealing ring failure
  • Reduced bearing, thrust washer & sealing ring life
Zip Kits

Front/Rear Unit Endplay Shim 34500-Z

Updated 3-tang style shim fits all units, including '97-later 4L80/85-E.

  • Material: Steel
  • Tang Count: 3
  • Inner Dia.: 1.165"
  • Thickness: 0.010"
  • Outer Dia.: 1.940"
    Helps cure:
  • Excess front endplay
  • Excess rear endplay
  • Burnt Forward clutch
  • Premature seal ring failure
Zip Kits

Governor 400

2nd Design Only

    Helps cure:
  • Shift concerns
Zip Kits

Governor Gear Kit 402

  • Color: White
    Helps cure:
  • Shift concerns
Zip Kits

Pinion Washer 34875-03

Fits output and reaction planetaries for all model years.

    Helps cure:
  • Lost or damaged component
Zip Kits

Pinion Pin 34875-01

Fits output and reaction planetaries for all model years.

    Helps cure:
  • Lost or damaged component
  • Output & planet assembly wear
  • Output & planet assembly failure
Zip Kits

Pinion Roller 34875-02

Output & reaction planetaries, '69–'98 earlier with .750" wide pinion gears

    Helps cure:
  • Lost or damaged component
Zip Kits

Pinion Thrust Washer 34875-04

For '98-earlier GM 400, 4L80-E and 4T65-E output and reaction planetaries with .750" wide pinion gears.

    Helps cure:
  • Lost or damaged component
Zip Kits

Planetary Rebuild Kit 34875RK

Output & reaction planetaries, '69–'98 with .750" wide pinion gears

    Helps cure:
  • Lost or damaged component
Zip Kits

Rear Unit Endplay Shim 34006-05

.005" Thick

  • Material: Steel
  • Inner Dia.: 2.375"
  • Thickness: 0.005"
  • Outer Dia.: 3.250"
    Helps cure:
  • Excess rear endplay
Linkage
Zip Kits

Shift Lever Kit 38512-01K

Pump
Zip Kits

Boost Valve Kit 34910-01K

O-Ring Style

    Helps cure:
  • Low line rise
  • 1-2 Soft
  • 2-3 Soft
  • Delayed Reverse
  • Reverse shudder
Zip Kits

Boost Valve Kit 34910-05K

Factory Style, No O-Rings

    Helps cure:
  • Low line rise
  • 1-2 Soft
  • 2-3 Soft
  • Delayed Reverse
  • Reverse shudder
Zip Kits

Front Pump Bolt 28136

  • Thread Style: 5/16-18
  • Length: 1.375"
Zip Kits

Pressure Regulator Valve Kit 34910-03K

Fits '71–later units.

    Helps cure:
  • High & uncontrollable line pressure
  • Delayed converter charge
  • Poor Reverse engagement
Zip Kits

Pump Bushing 34234B-01

  • Bushing Style: Precision
  • Material: Bronze
  • Width: 0.600"
  • Shaft Dia.: 1.873"
  • Housing Bore: 2.001"
Zip Kits

Pump Bushing 34034T-01

Pump

  • Bushing Style: Precision
  • Material: Steel-backed bimetal
  • Width: 0.615"
  • Shaft Dia.: 1.873"
  • Housing Bore: 2.001"
Valve Body
Zip Kits

Checkball 10000-08

Imidized Plastic, .250" Dia.

  • Material: Imidized Plastic
  • Dia.: 0.250"
    Helps cure:
  • Lost or damaged component
Case
Zip Kits

Case Bushing 34006-SP

Case, “No Walk Out"

  • Material: Bronze
  • Bushing Style: Precision
  • Width: 0.690"
  • Shaft Dia.: 2.006"
  • Housing Bore: 2.129"
    Helps cure:
  • Bushing walks out
  • Case damage
  • Output shaft & case damage
  • Metal contamination
Zip Kits

Manual Shift Shaft Kit 38511-05K

Fits GM TH400 units only.

    Helps cure:
  • Lost or damaged component
Zip Kits

Pan Bolt 35801-01

    Helps cure:
  • Lost or damaged component