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07-08-2013, 04:14 AM
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#1 |
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Account Suspended
Join Date: Apr 2008
Location: Hesperia, Ca
Posts: 1,332
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Vehicle Speed Sensor
Quick question.
'84 C10. Originally came w/ a 305 and 700R4. Would I have a VSS (vehicle speed sensor) already? What does it look like/where is it located? I was under the impression the 700R needed VSS for TC lockup, so I'm hoping I already have one. In the middle of a TBI swap and I need to get one if I don't already have one. |
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07-08-2013, 10:33 AM
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#2 |
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Slots go on anything!
Join Date: May 2003
Location: Richardson, TX
Posts: 5,957
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Re: Vehicle Speed Sensor
You should have one. I used a VSS from Jags that Run when I did mine- the 2PRS.
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1974 Jimmy- 5.3/4L80e/NP241 |
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07-08-2013, 11:21 AM
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#3 | |
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Registered User
 
Join Date: Apr 2009
Location: New Freedom Pa.
Posts: 1,335
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Re: Vehicle Speed Sensor
Quote:
due to the engine vacuum constantly opening and closing the switch , converter lockup was always in and out , kind of annoying. Desert |
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07-08-2013, 03:29 PM
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#4 |
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Moderator
 
Join Date: Oct 2008
Location: Wentworth, NH
Posts: 4,977
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Re: Vehicle Speed Sensor
The 700R4 had a vacuum controlled TCC like ^^^
If your 83 has VSS it's off the speedometer for the overly complicated early 1980s electronic cruise control system.
__________________
1959 M35A2 LDT465-1D SOLD 1967 Dodge W200 B383, NP420/NP201 SOLD 1969 Dodge Polara 500 B383, A833 SOLD 1972 Ford F250 FE390, NP435/NP205 SOLD 1976 Chevy K20, 6.5L, NV4500/NP208 SOLD 1986 M1008 CUCV SOLD 2000 GMC C2500, TD6.5L, NV4500 2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263 2009 Impala SS LS4 V8 RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials...
And please let us know if and how your repairs were successful. |
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07-08-2013, 04:21 PM
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#5 |
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Registered User
Join Date: Sep 2009
Location: Weare,NH
Posts: 1,592
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Re: Vehicle Speed Sensor
Do you have factory cruise control? If so, you should already have a VSS on the back of the speedometer.
 This is what it typically looks like. Pink/Black stripe - 12V+ ign Black w/ white stripe - Ground Brown - 2k PPM output to ECM Extra yellow connector - 2k PPM output to cruise unit. You can get these optical VSS units off any 80's car or truck with cruise, or TBI; or both. Mine was from a 84 El Camino. You'll see this if you have no VSS. Any 81+ GM speedo has the provision for the optical VSS. Get the little screw too, you'll need it.  These pics are from when I installed a VSS for my TPI conversion in my 86. Works flawless, but grab a few from the pick a part, my first one didn't work, these are close to 30 year old electronics. They are easy to find. Pull the cluster, and trace the 3-wire ribbon back to the green (or yellow) box. Get the whole thing including pigtail, You'll need a small 5.5 or 6mm socket for the screw in the speedo. |
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04-28-2014, 10:20 AM
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#6 |
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Registered User
Join Date: Sep 2013
Location: Sioux Center IA
Posts: 185
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Re: Vehicle Speed Sensor
I know this thread is a little old but... How does the cruise control use the speed reference? In other words I want to use a Jags 2prs on my 87 to replace the green box behind speedometer. Do I hook the yellow and brown wires to the 2prs and ground the other wire on the 2Prs? I would like the ECM to use the reference. And I want cruise to work.
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