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 MANUALSBUICK1985ELECTRA BASE, 4D SEDAN, 4.3 TREPAIR AND DIAGNOSIS (SINGLE PAGE)TRANSMISSIONAUTOMATIC TRANSOVERHAUL - 200-4RTRANSMISSION REASSEMBLYEXTERNAL PARTS
1985 Buick Electra Base, 4D Sedan, 4.3 T
External Parts
1985 Buick Electra Base, 4D Sedan, 4.3 TSECTION External Parts
- Remove output shaft loading fixture and support sleeve from rear of transmission case. Turn transmission to horizontal position with oil pan side up. If removed, install new oil seal ring on governor shaft. Install governor assembly into case. Install governor cover and tighten attaching bolts.NOTE: Ensure governor shaft is piloted in governor cover before tightening cover attaching bolts.
- With correct band apply pin installed, as determined during transmission disassembly, install intermediate servo assembly into case. Ensure tapered end of apply pin is properly located against band apply lug. Install servo cover retaining ring and align ring gap with end showing in case slot.NOTE: Intermediate servo cover seal rings must be well lubricated with petroleum jelly to prevent damage or cutting of ring.
- Lubricate with petroleum jelly and install new "O" rings on case electrical connector. Install electrical connector with lock tabs facing into case, positioning locator tab in notch on side of case.
- Install a new Teflon seal on 3-4 accumulator piston. Install accumulator pin in case. Install accumulator piston and spring. See Fig 1 .
- Install 9 check balls into locations in case. See Fig 2 . Install 2 valve body alignment pins into opposing bolt holes. Install spacer plate-to-case gasket (marked "C") on case. Install spacer plate.
- Install valve body assembly-to-spacer plate gasket (marked "VB") on spacer plate. Position 1-2 accumulator plate and gasket in place on case, install accumulator spring on plate. Install a new Teflon seal on 1-2 accumulator piston, install piston in accumulator housing with dome up. Install 1-2 accumulator assembly. Install and tighten 5 attaching bolts in original positions.
- Position the remaining 3 check balls in valve body. See Figure
. Retain with petroleum jelly. Remove alignment pins. Install valve body assembly making sure to align manual valve with detent lever.NOTE: It is possible during reassembly to position manual valve too far into valve body and still connect selective lever link to it. This will prevent valve body from fitting properly in case.
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.