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 MANUALSFORD1985BRONCO 5.8 G, STANDARD, NP435REPAIR AND DIAGNOSIS (SINGLE PAGE)TRANSMISSIONMANUAL TRANSOVERHAUL - TOD 4-SPEED OVERDRIVECOMPONENT DISASSEMBLY & REASSEMBLYGEARSHIFT HOUSING ASSEMBLY OVERHAULDISASSEMBLY
1985 Ford Bronco 5.8 G, Standard, NP435
Gearshift Housing Assembly Overhaul: Disassembly
1985 Ford Bronco 5.8 G, Standard, NP435SECTION Disassembly
- With gearshift housing in vise, drive out roll pins that retain 3rd-overdrive shift pawl and 3rd-overdrive shift gate making sure not to strike bias spring.
- Slide 3rd-overdrive shift pawl to front of housing. Insert a punch in exposed roll pin hole in rail and rotate rail 90 degrees, this will prevent meshlock plunger from locking rail in place. See Fig 1 .
- Position a screwdriver in slots provided in housing and pry plugs from housing. Discard plugs. Using a brass drift drive 3rd-overdrive shift rail from housing. Remove interlock pin from rail. Remove 3rd overdrive shift pawl and shift gate. from housing.
- Remove each interlock plunger from housing through rear 3rd-overdrive rail bore. By tilting housing, plungers should fall out. Drive out roll pin retaining 1st-2nd shift fork to rail, be careful not to drive pin into inner wall of housing. See Fig 1 .
- Slide 1st-2nd shift fork to front of case. Insert a punch into exposed roll pin hole and rotate rail 90 degrees, this will prevent meshlock plunger from locking rail in place. Use a brass drift to drive 1st-2nd shift rail from housing.CAUTION: Cover plunger and spring bore to prevent plunger and spring from flying out after rail is removed.
- Remove 1st-2nd shift fork from housing. Slide reverse fork and rail assembly forward so it is in Reverse position. Drive out reverse fork roll pin. Slide reverse fork rearward, insert a punch in roll pin hole and rotate rail 90 degrees. This will prevent meshlock plunger from locking rail in place.
- Drive reverse rail from housing using a brass drift. Remove reverse fork from housing. Remove 3 meshlock plungers and interlock springs from bores in housing.CAUTION: Cover plunger and spring bore to prevent plunger and spring from flying out after rail is removed.
- Remove "C" clip retaining reverse rocker arm assembly to housing. Force shift bias spring outward only enough to remove reverse rocker arm assembly. Remove assembly from housing. DO NOT disassemble reverse rocker arm assembly. If necessary, remove back-up light switch and gasket from housing.
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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.