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Old 05-16-2020, 07:42 PM   #1
GB SISSON
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Default Speedometer needle

The needle on my 47 tonner sits on 5 mph in the garage. It looks like it reads 10 mph over actual speed according to those awful digital speed signs the sherriff's dept has mounted on little trailers. This is my diesel converted with a GM SM465 4 speed. I think I have two situations to address. The stock ford tonner rear is something like 4:68 and the chev one ton tranny donor had a 4.11. Before I address the rear end /speedo drive gear, can I just pull the needle off the gauge and stick it back on at zero? Seems I read somewhere that it's a press on fit. Then , next I'll research the different GM drive gears after my dial reads zero.
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'47 1/2 ton pickup next project, '47 one ton panel 99% stock nearing completion, '47 2 ton with 8ba and 9' script stakebed, '46 1/2 ton woodie project,'59 F350 9' flareside pickup with cummins 6at. 'Rusty ol' floorboards, hot on their feet' (Alan Jackson)
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Old 05-16-2020, 10:13 PM   #2
51504bat
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Default Re: Speedometer needle

Can't help you on the needle issue but to dial in the speedo you can always use one of these: https://transmissioncenter.net/shop/...ratio-adapter/
Dodge Ford GM Ratio Adapter, Select Speed Up Rate
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File Type: jpg SpeedoReduction.jpg (49.2 KB, 7 views)
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Old 05-16-2020, 11:12 PM   #3
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Default Re: Speedometer needle

Yes, the needle is press-on. I gently pulled mine off holding the circle base with my fingers and then tapped in back on with my finger.
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Old 05-17-2020, 08:37 AM   #4
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Default Re: Speedometer needle

Be careful as the needle is aluminum and will bend/break quite easily. A clock repair person could pull and replace it quickly and safely.
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Old 05-17-2020, 10:24 AM   #5
GB SISSON
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Default Re: Speedometer needle

Quote:
Originally Posted by D. Jones View Post
Be careful as the needle is aluminum and will bend/break quite easily. A clock repair person could pull and replace it quickly and safely.
That would mean a ferry trip off this rock I live on. Haven't left in many months. I have a non working speedometer in rough shape. Maybe I'll do a test run on that one. Thanks. And on the speed up drive gear I think I need to slow mine down. I'll move the needle and then go through the speed trap again. Thanks all!
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'47 1/2 ton pickup next project, '47 one ton panel 99% stock nearing completion, '47 2 ton with 8ba and 9' script stakebed, '46 1/2 ton woodie project,'59 F350 9' flareside pickup with cummins 6at. 'Rusty ol' floorboards, hot on their feet' (Alan Jackson)
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Old 05-17-2020, 10:33 AM   #6
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Default Re: Speedometer needle

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Use the Speedometer App on your smart phone
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Old 05-17-2020, 10:35 AM   #7
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Default Re: Speedometer needle

Another option for testing accuracy, if you have a smartphone, is a speedometer app. The speedo in my 1941 Ford 1/2 ton pickup is about 25% slow, so the cheap short term fix is to use an app.
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Old 05-17-2020, 11:53 AM   #8
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Default Re: Speedometer needle

i have pulled them off before. if you gently lift the pointer over the stop peg at zero, let the pointer find its place of rest, make a note of it, pull the pointer off and move it 5mph or what ever you need, and press it back on. be careful touching any of the main face as this old silkscreen can be very fragile and start flaking off. you can do it right there on the rock GB
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Old 05-17-2020, 02:49 PM   #9
1948F-1Pickup
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Default Re: Speedometer needle

And this speedo has ALWAYS been 5 mph off? I just cleaned and lubed the speedo in my 48. At rest it was sometimes at 5 and occasionally at -5....
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Old 05-18-2020, 10:44 PM   #10
GB SISSON
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Default Re: Speedometer needle

Without touching it this afternoon it was at Zero at rest..... Arrrrgh!
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Old 05-19-2020, 04:16 PM   #11
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Default Re: Speedometer needle

It may just need to get serviced. and then checked for speed.
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Old 05-19-2020, 04:23 PM   #12
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Default Re: Speedometer needle

Quote:
Originally Posted by GB SISSON View Post
Without touching it this afternoon it was at Zero at rest..... Arrrrgh!

You must of driven in reverse pretty fast ! At least 5 mph .
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Old 05-19-2020, 11:37 PM   #13
GB SISSON
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Default Re: Speedometer needle

Today it was back at 5mph at rest. I unscrewed the cable from the head and the needle stayed at 5. I rotated the shaft with my fingertips and I could spin it back to zero, but it returned to 5 after. Thinking it needs some light lube. Isn't there somplace to lube it like a felt?
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Old 05-19-2020, 11:51 PM   #14
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Default Re: Speedometer needle

you will see 2 little tiny cups, like miniature frost plugs on the main housing, use a small tap, like 8/32 or so, pull the caps and give'er a drink of a couple drops of 3n1 or light oil. best wishes
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