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C3 part name needed please!!!!

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Old May 23, 2021 | 09:01 PM
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Default C3 part name needed please!!!!
This is my 1977 corvette and I need help figuring out what the name of this vacuum type canister is. Please and thank you.

The cable inside the rubber piece is broken and I’m not sure what’s it’s called
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Old May 23, 2021 | 09:21 PM
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It's called an actuator, but I'm not sure why it's down below the master cylinder and by the steering box. This looks like the smaller diameter (~5"-6") actuator that earlier years used for the windshield wiper door. Maybe '77s had another use for it. There should be two, large diameter actuators (~8"-9") between the headlight doors.
Last edited by barkingrats; May 23, 2021 at 09:22 PM.
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Old May 23, 2021 | 09:30 PM
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I'm thinking cruise control actuator
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Old May 23, 2021 | 10:11 PM
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Yes, it's for your cruise control. Group 3.885, part number 6494922 (may have been superceded by a newer number), GM name is 'servo'.
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Old May 23, 2021 | 10:14 PM
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Cruise Control Servo.
Servo & Cable are 77 one year only parts.


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Old May 23, 2021 | 10:18 PM
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If the ball chain just broke, it is an easy fix. I just bought a drain plug at Home Depot that had that style chain.
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Old May 23, 2021 | 10:28 PM
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Originally Posted by Catfish4818
Yes, it's for your cruise control. Group 3.885, part number 6494922 (may have been superceded by a newer number), GM name is 'servo'.
Yep, correct group and part number.
The Cable is Gr. 3.880 GM #460824.
Both are VERY hard to find new or good used.

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Old May 23, 2021 | 10:32 PM
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Originally Posted by bruiser
If the ball chain just broke, it is an easy fix. I just bought a drain plug at Home Depot that had that style chain.
Yes I believe it is a #10 chain or 4.5mm
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Old May 23, 2021 | 10:46 PM
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This is how to vacuum test the Servo:


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Old May 24, 2021 | 09:59 AM
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cruise controller actuator and its name is Steve.
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