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1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks Discuss the Early Eighties Bullnose Ford Truck

Speedometer mis-match help please

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Old Jun 28, 2023 | 05:45 PM
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Speedometer mis-match help please

Hi
I have a 1986 Ford F350 with a 460. I purchased it with a non-working speedometer. Today I learned the transmission has been swapped and has a (VSS) vehicle speed sensor. The issue is the speedometer on the dash is mechanical. Any suggestions on how to get a functioning speedometer out of this mess would be appreciated…
thank you
Larry
 
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Old Jun 28, 2023 | 06:29 PM
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What transmission dose the truck have in it?
Dave ----
 
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Old Jun 28, 2023 | 06:48 PM
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I’m not certain, but I’ll look so I can answer your question. Today by a mechanic he said it’s newer than the truck therefore the difference. I love the truck it’s sorta been patch worked! Lol
 
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Old Jun 28, 2023 | 06:57 PM
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Auto or manual trans?
Is there a hole where the speedo cable should be with the plug for the VSS hook up?
Dave ----
 
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Old Jun 28, 2023 | 07:21 PM
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Manual…the speedo is definitely manual and the transmission is VSS. I guess I could just use the GPS on my phone 😵‍💫
 
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Old Jun 28, 2023 | 07:48 PM
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Originally Posted by Larry115
Manual…the speedo is definitely manual and the transmission is VSS. I guess I could just use the GPS on my phone 😵‍💫
You need to find out what the model of the transmission is. Some models had older brothers in earlier years that had a mechanical speedometer hook up. Sometimes you can retro-fit that to your newer transmission, sometimes you can't.
 
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Old Jun 28, 2023 | 08:37 PM
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Great idea! Will the info be stamped somewhere?
 
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Old Jun 29, 2023 | 05:56 AM
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How many gears does your manual transmission have? Here's a good info page.

https://www.blueovaltrucks.com/tech-...transmissions/
 
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Old Jun 29, 2023 | 08:39 AM
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4 speed manual
 
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Old Jun 29, 2023 | 10:15 AM
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Originally Posted by Franklin2
You need to find out what the model of the transmission is. Some models had older brothers in earlier years that had a mechanical speedometer hook up. Sometimes you can retro-fit that to your newer transmission, sometimes you can't.
That is what I was thinking but we need to know the model of trans.

Originally Posted by Larry115
4 speed manual
4 speed manual trans?
Are you sure?
I am thinking any manual transmission that uses VSS has to be a 5 speed over drive.
Then again does the trans have a granny first gear and you drive it like a 3 speed starting in 2nd gear?
Maybe a NP435 4sp or a T19 but dont think the T19 really had a granny first gear? or either had VSS?

See if you can post up pictures of both sides of the transmission.
Dose it have ant PTO covers?
Dave ----
 
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Old Jun 30, 2023 | 06:57 AM
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Sorry guys I helped the neighbor yesterday building a hay and horse shelter. I haven’t crawled under my truck yet to get the make of model of the tranny. It does have a granny first gear and I start out in 2nd. I did find 2 cut wires coming out the side and zero places to screw in a mechanical speedo cable. When I do crawl under exactly what am I looking for? I’m not a mechanic at all…thank you
 
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Old Jun 30, 2023 | 09:12 AM
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When you can tank a picture of the wires where they are on the trans as they might be for the backup light switch.
Speedo should be on the tail housing.
Dave ----
 
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Old Jun 30, 2023 | 09:15 AM
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I’ll do that! Great suggestion
 
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