This Knowledgebase has been developed to cover the most frequently asked questions about Corvettes. Using our system, you can search for topics separated into categories by Corvette generation. Some of the information here comes directly from Chevrolet Service News publications, Service Bulletins, Recall Notices and other technical sources as indicated.
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- 1982 - 1991: Service Bulletin: New Output Shafts and Seals (Product Service Information)
...HAFTS & SEALS (PRODUCT SERVICE INFORMATION) Model and Year: 1982-91 CAPRICE, CAMARO AND CORVETTE 198...creased lube flow. Since lube hole locations have changed, the input housing to output shaft seal ha...
- 1982 - 1991: Service Bulletin: Transmission Stuck in First Gear
Subject: TRANSMISSION STUCK IN FIRST GEAR Model and Year: 1982-91 CAPRICE, CAMARO AND CORVETTE 1982-91 C/K, G, S/T' 1985-91 M VAN 1987-91 RN AND 1990-91 L VAN WITH 4L60 AUTOMATIC TRANSMISSION Sourc...
- 1982 - 1993: Service Bulletin: Buzzing Noise at Idle
Subject: BUZZING NOISE AT IDLE (INSTALL PRESSURE REGULATOR VALVE) Model and Year: 1982-93 CAPRICE, CAMARO AND CORVETTE 1982-93 C/K, R/V, S/T, M/L AND G TRUCKS WITH 4L60 AUTOMATIC TRANSMISSION Trans...
- 1968: Service Bulletin: Driveline Clicking or Snapping Noise
Subject: Driveline Clicking or Snapping Noise Model Year: 1968 Passenger Cars and 10 Series Tru...when the direction of torque input to the axle is changed, such as driving forward after reverse ope...
- 1974 - 1975: Service Bulletin: Stripped Speedometer Driven Gear
Subject: Stripped Speedometer Driven Gear Model and Year: 1974 - 1975 Corvette with 4-Speed Transmission Source: Chevrolet Dealer Service Technical Bulletin Bulletin No: 75-T-3 Section: XII Date:...
- 1968 - 1969: Chevrolet Service Engineering Letter: Service Procedures for Clutch Gear Slinger on Muncie 4-Speed Passenger Transmissions
...69-3 25 Subject: Service Procedures for Clutch Gear Slinger on Muncie 4-Speed Passenger Transmissio... view. The one pointing to the slinger should be changed to Item #24, Main Drive Gear Bearing Oil S...
- 1984 - 1992: Service Bulletin: Intermittent Transmission Downshift / Slip Diagnosis
..., SLIP OR BUSY/CYCLING TCC Model and Year: 1983-92 ALL PASSENGER C...ecessary. The vehicle should be returned to the customer and the co...em or transmission parts will not change or reduce the noise level....
- 1984 - 1985: Service Bulletin: Improperly Installed Reverse Idler Shaft Roll Pin
Subject: IMPROPERLY INSTALLED REVERSE IDLER SHAFT ROLL PIN Model and Year: 1984-1985 CORVETTE Source: Chevrolet Service Bulletin Bulletin Number: 85-31 - (01/09/1985)
Damage to the manual transm...
- 1984 - 1987: Technical Article: Rebuilding the Doug Nash 4+3 Overdrive Unit
Nash Thrash Rebuilding the Doug Nash 4+3 Overdrive Unit.
by Dav... and then screw in two additional turns by rotating each bolt one t...ry to disassemble the O/D unit to change the direct clutch selectiv...
- 1985: Service Bulletin: Low Idle Speed and Launch Stalls
Subject: Low Idle Speed and Launch Stalls Model and Year: 1985 Corvette Source: Chevrolet Dealer Sevice Bulletin Bulletin Number: 85-185, Section 6E Date: Mar., 1986
TO: ALL CHEVROLET DEALERS
- 1987 - 1991: Service Bulletin: New 3-4 Club Plates for 4L60 Transmissions
Subject: NEW 3-4 CLUTCH PLATES (STEEL) 4L60 TRANSMISSIONS Model and Year: 1987-91 CAPRICE, CAMARO, CORVETTE WITH 4L60 AUTOMATIC TRANSMISSION 1987-91 C/K, G, M, RN, S/T TRUCK 1990-91 L TRUCK WITH 4L...
- 1987 - 1991: Service Bulletin: 4L60 Low & Reverse Clutch New Plate Available
Subject: 4L60 LOW & REVERSE CLUTCH NEW WAVE PLATE IS AVAILABLE Model and Year:1987-91 CAPRICE, CAMARO, CORVETTE AND 1987-91 C/K, RN, S/T TRUCKS, G, M VANS AND 1990-91 L VAN WITH 4L60 AUTOMATIC TRA...
- 1988 - 1993: Service Bulletin: Click/Whine in 3rd/4th Gear
Subject: CLICK/WHINE IN 3RD/4TH GEAR INST. NEW CLUTCH FIBER PLATES Model and Year: 1988-93 CAPRICE, CAMARO AND CORVETTE 1988-93 C/K, RN, S/T, M AND G TRUCKS 1990-93 L VAN Source: Chevrolet Service ...
- 1989 - 1996: Differences between First and Second Generation ZF 6-Speed Transmissions
From ZF regarding ZF transmission noise and differences betwen the ZF used in early and late ZR-1...ear growl"." In 1993, the part number for the ZF changed from 10186865 to 10255122. In the second g...
- 1989 - 1990: Service Bulletin: Transmission Exchange Program 6 Speed M/T (ML9)
...E PROGRAM 6 SPEED M/T (ML9) Model and Year: 1989-91 CORVETTE ZF 6-S...6-speed manual transmission, an exchange program is now in effect a...s number must be written on the return transmission case cover befo...
- 1989 - 1991: Service Bulletin: No/Delayed Reverse When Cold
Subject: NO/DELAYED REVERSE WHEN COLD INSTALL REV. INPUT CLUTCH SEAL Model and Year: 1989-91 CAPRICE CAMARO AND CORVETTE 1989-91 C/K, R/V, S/T, G AND M TRUCKS 1990 L TRUCKS WITH 4L60 AUTOMATIC TR...
- 1989 - 1996: Service Bulletin: Information on Corvette ZF 6-Speed Manual Transmission Service Procedure
Model Year: 1989-96 CHEVROLET CORVETTE WITH ZF 6-SPEED MANUAL TRANSMISSION (ML9) Subject: INFORMATION ON CORVETTE ZF 6-SPEED MANUAL TRANSMISSION SERVICE PROCEDURE Source: Chevrolet Dealer Service Bull...
- 1989: Howling, or Squealing Sound Coming From Clutch
From Jim Ingle, GM Powertrain Engineer: "The problem you're most likely experiencing is a noisy ...(foot off the pedal) the transmission input shaft turns with the crankshaft, so there's no relative ...
- 1990 - 1991: Service Bulletin: 3-2 Coast Down Clunk
Subject: 3-2 COAST DOWN CLUNK (INSTALL SERVO SPRING) Model and Year:1990-91 CORVETTE WITH 4L60 AUTOMATIC TRANSMISSION Source: Chevrolet Service Bulletin Bulletin Number: 91-372-7A - (06/27/1991)
- 1990 - 2003: Service Bulletin: Info - Diagnosis of Cracked or Broken Transmission Case
Number: 02-07-30-024 Subject: Info - Diagnosis of Cracked or Broken Transmission Case Model Year: 1990-1993 Buick Roadmaster, Estate Wagon 1990-1996 Cadillac Fleetwood 1990-1996 Chevrolet Caprice 19...
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