Author Topic: 77 C10 Custom Deluxe Cluster Removal  (Read 728 times)

Offline Knighthawk1911

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77 C10 Custom Deluxe Cluster Removal
« on: March 31, 2024, 08:06:15 PM »
Any tips on getting the cluster out? I have the wire harness disconnected, but I cannot get the Speedo cable to slip off.

Additionally, I have the mechanical link behind my oil gauge with a threaded fitting. Any tips on getting this off? I cannot pull the cluster out very far without these binding.

Offline Mr Diesel

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Re: 77 C10 Custom Deluxe Cluster Removal
« Reply #1 on: March 31, 2024, 08:43:10 PM »
The speedo has a clip on the bottom that holds cable in place. Sometimes you can reach up there with your hand and just push it, or push with a long flathead screwdriver while pulling back on cable sleeve. I dont have access to any pics right now but DuckDuckGo some search terms like "Chevy speedo cable".
1976 C20 Crewcab, 6.2L/SM465
1982 K30 Crewcab , 427TD/TH400
1983 C30, 6.2L/TH400
1983 K30 Crewcab 454/700R4
1986 K10 350/400. 1989 K30 cab/chassis 454/SM465

Offline bd

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Re: 77 C10 Custom Deluxe Cluster Removal
« Reply #2 on: March 31, 2024, 11:45:39 PM »
This ^^^^^.  If the truck has A/C, remove the driver-side A/C duct that crosses under the steering column.  With the instrument cluster firmly secured in the dash, while kneeling on the floor use your left hand to reach up behind the cluster from below and wrap your fingers around the cable with your thumb pointing toward the speedometer head.  Remove the cable from the speedometer by pushing the spring retaining tab toward the cluster with your left thumb while simultaneously pulling the cable away from the cluster with your left hand.

Removing the pressure tube from the oil gauge can be a PITA.  Due to limited accessibility, use a compact open-end wrench that properly fits the tube nut at the gauge attachment.  If the gauge has a back-up nut, support it with a wrench when loosening or tightening the line nut.  Be careful that you don't overtighten the line nut during subsequent reinstallation.  Depending on the configuration, you may find it beneficial to disconnect the pressure tube from the engine first, allowing the tube to slip more freely through the firewall providing additional line slack.
Rich
It's difficult to know just how much you don't know until you know it.
In other words... if people learn by making mistakes, by now I should know just about everything!!!
87 R10 Silverado Fleetside 355 MPFI 700R4 3.42 Locker (aka Rusty, aka Mater)

Offline Knighthawk1911

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Re: 77 C10 Custom Deluxe Cluster Removal
« Reply #3 on: April 03, 2024, 01:18:22 AM »
Thanks for all the help guys. I will give it a go this weekend. My speedo cable seems to be particularly stubborn. I guess thatís what happens when itís on there for 50 years.

Offline philo_beddoe

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Re: 77 C10 Custom Deluxe Cluster Removal
« Reply #4 on: May 29, 2024, 09:54:18 PM »
I just installed a new speedo cable, was watching a few vids on it and folks were disassembling their entire dash, removing dash pad, gauges, etc., thatís crazy.  What bd said is good, and yes you can just reach up behind the dash and grab it while the thumb lifts the clip and pull. But get a flashlight under there and have a look first.
Behold, the day of the LORD cometh, and thy spoil shall be divided in the midst of thee.  Zechariah 14:1

Offline MIKE S

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Re: 77 C10 Custom Deluxe Cluster Removal
« Reply #5 on: May 29, 2024, 11:45:16 PM »
You can also disconnect the speedo cable at the transmission and remove any hold down clamps that attach the cable to the body an push the cable thru the firewall grommet to push the cluster from the dash to give more clearance to disconnect the cable at the speedo. You can also do the same to the oil line at the engine and carefully guide it thru the firewall.

Offline ehjorten

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Re: 77 C10 Custom Deluxe Cluster Removal
« Reply #6 on: May 30, 2024, 10:21:26 AM »
This ^^^^^.  If the truck has A/C, remove the driver-side A/C duct that crosses under the steering column.  With the instrument cluster firmly secured in the dash, while kneeling on the floor use your left hand to reach up behind the cluster from below and wrap your fingers around the cable with your thumb pointing toward the speedometer head.  Remove the cable from the speedometer by pushing the spring retaining tab toward the cluster with your left thumb while simultaneously pulling the cable away from the cluster with your left hand.

I did this exact same procedure on my '77 K20 Silverado. Getting it free after 46 years wasn't too bad. Bought a new cable, pulled the cable out of the sleeve and coated it with white lithium grease, but it back in, and transferred the original, aluminum strain relief from at the transfer case to the new cable. I also installed a thermal cover over the sleeve where it crosses over the aftermarket exhaust pipe to prevent it from melting again.
-Erik-
1991 V3500 - Gen V TBI 454, 4L80E, NP205, 14 bolt FF, D60, 8" Lift on 35s
1977 K20 Silverado - 350, THM350, NP203, 14 bolt FF, D44, Stock Lift on 31s
1969 Chevelle Malibu Sport Coupe - EFI350, THM350
1968 Chevrolet Step-side Pickup - 300HP L6