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 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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Clutch and Transmission
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There were 33 articles found in this category:
 1982 - 1990: Service Bulletin: Service Replacement Transmission Assembly (SRTA) Update
Subject: SERVICE REPLACEMENT TRANS ASSY (SRTA) UPDATE Model and Year: 1982-90 CAPRICE, CAMARO AND CORVETTE 1982-90 C1/C2, K1/K2, G1/G2, S1/S2 TRUCK 1987-90 R1/R2, V1/V2 TRUCK 1985-90 M1, 1990 L1 TRUCK Source: Chevrolet Service Bulletin Bulletin Number: 90-372-7A - (10/15/1990) TO: ALL CHEVROLET ...
- 1982 - 1991: Service Bulletin: Evaluating Peened Spacer Plate (Service Information)
Subject: EVALUATING PEENED SPACER PLATE (Service Information) Model and Year: 1982-1991 ALL PASSENGER CARS AND TRUCKS WITH AUTOMATIC TRANSAXLES AND TRANSMISSIONS (EXCEPT GEO) Source: Chevrolet Service Bulletin Bulletin Number: 91-396-7A - (08/08/1991) TRANSMISSION APPLICATIONS: All HYDRA-MATIC ...
- 1982 - 1991: Service Bulletin: New Output Shafts and Seals (Product Service Information)
Subject: NEW OUTPUT SHAFTS & SEALS (PRODUCT SERVICE INFORMATION) Model and Year: 1982-91 CAPRICE, CAMARO AND CORVETTE 1982-91 C1/C2, G1/G2, K1/K2, S/T 1987-91 R/V 1985-91 M AND 1990-91 L TRUCKS WITH 4L60/THM 700-R4 AUTOMATIC TRANSMISSION Source: Chevrolet Service Bulletin Bulletin Number: 91-39 ...
- 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 Source: Chevrolet Service Bulletin Bulletin Number: 91-371-7A - (06/28/1991) Bulletin Covers: Some HYD ...
- 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 Transmission Applications: 1982-1993 HYDRA-MATIC 4L60 (MD8) Transmission Models: All Vehicle Application ...
- 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 transmission may occur if the roll pin securing the reverse gear idler shaft to adapter plate (Figure 1) is ...
- 1984 - 1987: Technical Article: Rebuilding the Doug Nash 4+3 Overdrive Unit
Nash Thrash Rebuilding the Doug Nash 4+3 Overdrive Unit. by David Fulcher 1984-88 manual shift Corvettes came through with the Doug Nash 4+3 overdrive transmission. The '84 and '85 units were almost identical, with the only difference being a slightly revised oil pump to reduce some of the whi ...
- 1984 - 1992: Service Bulletin: Intermittent Transmission Downshift / Slip Diagnosis
Subject: INTERMITTENT TRANSMISSION DOWNSHIFT, SLIP OR BUSY/CYCLING TCC Model and Year: 1983-92 ALL PASSENGER CARS AND TRUCKS WITH AUTOMATIC TRANSMISSION Source: Chevrolet Service Bulletin Bulletin Number: 92-42-7A - (11/07/1991) Some owners may comment that their vehicle is experiencing one or ...
- 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 Some 1985 Corvettes with manual transmission may experience complaints of low idle speed and launch st ...
- 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 TRANSMISSION Source: Chevrolet Service Bulletin Bulletin Number: 91-186-7A - (01/29/1991) SERVICE INFO ...
- 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 4L60 AUTOMATIC TRANSMISSION Source: Chevrolet Service Bulletin Bulletin Number: 91-112-7A - (11/09/1 ...
- 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 Bulletin Bulletin Number: 93-228-7A THIS BULLETIN CANCELS AND SUPERSEDES DEALER SERVICE BULLETIN NO ...
- 1989 - 1990: Service Bulletin: Transmission Exchange Program 6 Speed M/T (ML9)
Subject: TRANS. EXCHANGE PROGRAM 6 SPEED M/T (ML9) Model and Year: 1989-91 CORVETTE ZF 6-SPEED MANUAL TRANSMISSION WITH ML9 OPTION Source: Chevrolet Service Bulletin Bulletin Number: 91-89-7B - (10/31/1990) TO: ALL CHEVROLET DEALERS THIS BULLETIN CANCELS AND SUPERSEDES DEALER SERVICE BULLETIN ...
- 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 TRANSMISSION Source: Chevrolet Service Bulletin Bulletin Number: 91-493-7A - (03/11/1992) TRANSMISSION ...
- 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-1s - July 12, 2000: "All S6-40 transmissions installied in the C4 Corvette contain 100% helical gears. In fact, all of the gearboxes ZF produces for passenger car applications contain helical gears, ...
- 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 Bulletin Bulletin Number: 77-72-04 INFORMATION GM OF CANADA AND NAES DEALERS ARE NOT AUTHORIZED TO U ...
- 1989: Howling, or Squealing Sound Coming From Clutch
From Jim Ingle, GM Powertrain Engineer: "The problem you're most likely experiencing is a noisy crankshaft pilot bushing. There is a later design released for service that tends to retain grease better than the one you have and therefore doesn't squeal when cold. Unfortunately, the transmissio ...
- 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) TRANSMISSION MODELS: OYDM, 1 YDM, 1 YHM Bulletin Covers: Some 1990 and 1991 Chevrolet Corvettes may ...
- 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 1990-2002 Chevrolet Camaro 1990-2003 Chevrolet Corvette 1995-1996 Chevrolet Impala 2000-2003 Chevrol ...
- 1990: Service Bulletin: Clutch Apply Plate Material Changed to Powdered Metal
Subject: CLUTCH APPLY PLATE MATERIAL CHANGED TO POWDERED METAL Model and Year: 1990 ALL CARS, TRUCKS, VANS WITH 4L60 (700-R4) AUTOMATIC TRANSMISSION Source: Chevrolet Service Bulletin Bulletin Number: 90-189-7A - (03/06/1990) This bulletin covers a material change for the forward and 3-4 clutch ...
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