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 MANUALSBUICK1993ROADMASTER LIMITEDREPAIR AND DIAGNOSISTRANSMISSIONAUTOMATIC TRANSOVERHAUL - 4L60/4L60-E
1993 Buick Roadmaster Limited
Overhaul - 4L60/4L60-E
1993 Buick Roadmaster LimitedSECTION Overhaul - 4L60/4L60-E
- Application & Labor Times
- Identification
- Description
- Lubrication & Adjustments
- On-Vehicle Service
- Trouble Shooting
- Notes
- Symptom Diagnosis
- 1st Gear Only, No Upshift
- 1st Gear Start In 2nd Gear Start Mode (Camaro & Firebird Only)
- Slips in 1st
- High Or Low 1-2 Shift Speeds
- Slipping Or Rough 1-2 Shift
- Slipping, Rough Or No 2-3 Shift
- 1st & 4th Or 2nd & 3rd Gear Only
- 3rd Gear Only
- 3-2 Flare Or Tie Up
- Slipping, Rough or No 3-4 Shift
- No "R" Or Slips In "R"
- No Part-Throttle Or Delayed Downshifts
- Harsh Garage Shifts
- No Overrun Braking in Manual 3-2-1
- Drives (Creeps) In Neutral
- Starts in 2nd in "D"
- No Park
- Oil Pressure High or Low
- Harsh Shift Points
- High Or Low Shift Points
- No Converter Clutch Apply
- Converter Shudder
- No Converter Clutch Release
- Converter Clutch Apply Cold
- Ratcheting Noise
- Oil Leaking Out Vent
- Vibration in Reverse & Whining Noise in Park
- Front Oil Leak
- No Reverse, Slips in Reverse, Bad Engagement (No Braking or Weak Braking in Manual Low)
- Pump Bushing Spins Out, "Walks" Into Seal, Or Seizes To Converter Hub
- Slip on 2-3 Shift, Falling Out of 3rd, Repeated 3-4 Clutch or 2-4 Band Failure
- Delayed or No Forward Clutch Engagement, Slips or Chatters in 1st Gear
- No 4th Gear, No 3-4 Upshift (Stays in 3rd, 2nd Usually Okay)
- Falls Out of 4th Gear During Coasting
- Binds Up on 3-4 Shift (Feels Like Brake Drag)
- No Forward Or Reverse Gears (Line Pressure Reading Okay)
- Binds Up In Reverse
- No Reverse
- No Drive In "D" Range
- No Drive In "OD" Range
- Clutch & Band Application
- Testing
- Torque Converter
- Removal & Installation
- Transmission Disassembly
- 2-4 Servo Assembly
- Checking Servo Pin Length
- Extension Housing
- Valve Body & Auxiliary Valve Body (4L60 Only)
- 1-2 Accumulator & Spacer Plates
- Transmission End Play Check
- Oil Pump, Input Clutch & Reverse Clutch
- 2-4 Band & Input Gear Set
- Reaction Gear Set
- Low-Reverse Clutch
- Inner Manual Shaft Linkage
- 3RD Accumulator Check Valve
- Cleaning & Inspection
- Component Disassembly & Reassembly
- Transmission Reassembly
- Torque Specifications
RENDER: 1.0x
NO RELATED
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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.