Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

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HOMESERVICE MANUALSCHEVROLET1983STEP VAN P20, 5.7 M, AUTOMATIC, 400/M40REPAIR AND DIAGNOSISTRANSMISSIONAUTOMATIC TRANSOVERHAUL - THM 400COMPONENT DISASSEMBLY & REASSEMBLYOIL PUMPBUSHING REPLACEMENT

1983 Chevrolet Step Van P20, 5.7 M, Automatic, 400/M40

Bushing Replacement

1983 Chevrolet Step Van P20, 5.7 M, Automatic, 400/M40SECTION Bushing Replacement

To replace oil pump body bushing, drive bushing from body with Remover/Installer (J-8092 and J-21465-17). Clean pump bushing bore. Drive bushing squarely into bore until flush or .010" (.25 mm) below gear pocket face.
To replace stator shaft rear bushing, mount pump cover in vise with stator shaft held in brass jaws. Assemble Remover (J-21465-15) to slide hammer and Adapter (J-2619 and J-2619-4) and remove bushing.
Clean shavings from stator bore. Place pump cover in vise with stator shaft resting on block of wood. Place new bushing on shoulder of Installer (J-21465-2). Bushing should be driven to depth of 19/32".
To replace stator shaft front bushing, mount pump cover in vise with stator shaft held in brass jaws. Attach Bushing Remover (J-21465-15) to slide hammer and Adapter (J-2619 and J-2619-4) and remove bushing.
Clean shavings from stator shaft. Assemble installer with Drive Handle (J-21465-3 and J-8092). Support hub of pump cover on soft material to protect ring lands and install bushing.

Fig 1: Installing Forward Clutch Piston Release Springs

Courtesy of GENERAL MOTORS CORP.

RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.