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Trans swap speedometer problems

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Old Sep 1, 2011 | 02:56 PM
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RRRoger
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Default Trans swap speedometer problems

I recently had my 91 Dodge 350 towed
They burned up the getrag (not NV3500) trans, so I opt to upgrade
to a 5spd overdrive NV4500
The Trans works great but the Speedometer does not.
The old one had a two wire plug, the new one three wire.

Is there a way to make this work?

I also have a new AfterMarket Speedometer that can use either but the wire diagram colors do not match and an AfterMarket VSS103 or OEM vss1 nor SC105 have any wire diagrams that I can find.
Do you know how to make this setup work?
 

Last edited by RRRoger; Sep 2, 2011 at 11:32 PM.
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Old Sep 2, 2011 | 12:29 PM
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Hahns5.2
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Originally Posted by RRRoger
I changed from the NV3500 to the NV4500 on my 1991 Dodge Diesel one ton.
Mine shifts better than before plus I like the ratio and Overdrive.
Problem I have is getting the 2 wire Speedometer to work with the 3 wire sender.
Does it have to go thru an ECM?
I have a new AfterMarket Speedo and VSS but no instructions or wiring diagram for the sender?
I can not get it to work either.
Your 1st gen CTD did not have an NV3500, it had a Getrag.
 
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Old Sep 2, 2011 | 11:30 PM
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Originally Posted by Hahns5.2
Your 1st gen CTD did not have an NV3500, it had a Getrag.
Sorry, I thought the Getrag was an NV3500
Now I need to change my post
My Speed Sensor wiring problem is still the same.
I need to find out how to wire the new Speed Sensor to either the old Speedometer or the new
AfterMarket one that can use 2 or 3 wires.
 

Last edited by RRRoger; Sep 3, 2011 at 01:05 PM.
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Old Dec 29, 2011 | 09:39 PM
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I was wondering the same thing. I am contemplating an auto to manual swap, and will get either a 3500 or 4500...but have questions about the speedo.
 
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Old Dec 30, 2011 | 09:42 AM
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Originally Posted by davb673
I was wondering the same thing. I am contemplating an auto to manual swap, and will get either a 3500 or 4500...but have questions about the speedo.
I have no regrets about the Overdrive Transmission.
The 4500 is a huge improvement over the Gerag.
But I still can not figure any way to get a speedometer to work.

I have two truck manuals and neither shows what the 4 wires at the trans do.
I am tempted to cut off the old plug and try connecting any two wires to a new two wire sender. There shouldn't be more than 9 combos but it would take a lot of time to est it out.

Does anyone have a wiring diagram?
 
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