Researching the details of the Chevy II and Nova
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Research Topic: 1970 TCS RelayThe TCS (Transmission Controlled Spark) relay was introduced during the 1970 model year. There were: two types of relays used. The 3983958 and the 961573. Each were date coded with very small numbers stamped into the case. two different mounting methods for each different relay. On the firewall and on the wiring gutter. three different fasteners used. Rivets, Screws, and plastic clips or plugs. Simply, the relay was used in conjunction with a transmission switch, a vacuum solenoid, and temperature switch. It varied the amount of vacuum sent to the distributor to aid emissions. While not in the business of selling parts. I have a limited supply of the correct style rivets to attach the TCS relay to the firewall wiring gutter. Email me for details. Research Goal:Determine what VIN / Body Number range was used for each of the relay changes.
Nova Research Project now has Correct TCS Relay Rivets and plugs.Available in limited quantities, the correct shape and finish TCS Relay Rivets. Use these original style rivets to attach the TCS relay to a new or existing wiring gutter. Also available are the correct plastic plus used early in the 1970 Model year. Send an email and ask for details.
TCS Relay SurveyPlease take a minute to email the information below. This Research Project relies on accurate facts gathered from people like you. These facts will be added to our database and used for statistical analysis. NO unique car or personal information will ever be released!
What is the VIN (We use this for indexing and date estimates.) What is the Body Number? Same as VIN. What is the date code off of the trim tag? E-mail to be used if we have any questions. What is the model year of the car being reported? What is the original engine size? What is the original transmission? Which relay is on the car? See picture above. How is the relay attached to the car? See picture above. Any other comments or information about your car. Send your Survey information to:
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