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T5 swap in '47 1/2 ton (jailbar)

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Old Feb 6, 2026 | 03:16 PM
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T5 swap in '47 1/2 ton (jailbar)

Has anyone here made this swap? I have just about everything figured out except for the speedo gear. Does anyone know which gear I need? T5 from a '91 S10, mated to a 239 flathead. Everything else is bone stock.
 
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Old Feb 7, 2026 | 10:00 AM
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Hopefully GB Sisson will see this and chime in. Or you can ask over on the Ford Barn, He's on there more often. He installed a T5 behind a Merc in his homemade woodie wagon. He is pretty much all things jailbar.
 
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Old Feb 13, 2026 | 08:46 AM
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The '91 T5 uses an electric signal type speedometer. To use a cable driven speedo you must switch to the early T5 tailshaft/housing, or use a converter box
 
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