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Old 09-29-2015, 08:21 AM   #1
Derek.Matirne
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Speedo hook up

My truck doesn't have a speedo cable... I'm going to get one this weekend, it's a 4x4.... I noticed the hook up on the tranny has something hooked up to it, and I would have to hook my cable to it, looks like some sort of a gear reducer or some sort... It is a 465 tranny, does this stay? Or do I remove it and go straight to the tranny? Thanks... Sorry, no pic right now...
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Old 09-29-2015, 08:29 AM   #2
LockDoc
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Re: Speedo hook up

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Originally Posted by Derek.Matirne View Post
My truck doesn't have a speedo cable... I'm going to get one this weekend, it's a 4x4.... I noticed the hook up on the tranny has something hooked up to it, and I would have to hook my cable to it, looks like some sort of a gear reducer or some sort... It is a 465 tranny, does this stay? Or do I remove it and go straight to the tranny? Thanks... Sorry, no pic right now...

Yes, it stays. The SM465 in my '72 Chevy has one. I call it an adapter.

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Old 09-29-2015, 08:46 AM   #3
geezer#99
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Re: Speedo hook up

And I call it a ratio adaptor.
Like on here.
http://www.transmissioncenter.net/sp...n_______va.htm
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Old 09-29-2015, 12:13 PM   #4
kehstr
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Re: Speedo hook up

that "adapter" is there to adjust for the different sizes of tires and axle gear ratio to keep your speedometer showing the correct speed
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Old 09-29-2015, 01:03 PM   #5
Derek.Matirne
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Re: Speedo hook up

Is this adapter adjustable? Or is a one shot only?
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Old 09-29-2015, 01:14 PM   #6
geezer#99
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Re: Speedo hook up

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Originally Posted by Derek.Matirne View Post
Is this adapter adjustable? Or is a one shot only?
It's usually a one shot.

I say 'usually' because I've seen adjustable ones many years ago.
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Old 09-29-2015, 01:23 PM   #7
GASoline71
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Re: Speedo hook up

Even the automatic transmissions had them as well. I have one on my TH350.

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Old 09-29-2015, 05:01 PM   #8
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Re: Speedo hook up

they are adjustable, but it's kind of difficult, you have to change the gears on the end of the trans. Plus sense they aren't very common anymore, they are hard to find
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