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Old 06-11-2022, 08:41 PM   #1
mike66
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Default J-type Speedo drive?

Hello, I’m about to swap a J type overdrive/ iron case M46 into my 89 745T to replace a bad P Type. My questions are, can I just weld the end of the speedometer drive shut, and does the speedo gear need to be in there or can I just toss it. Thanks in advance.
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Old 06-11-2022, 08:51 PM   #2
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You should remove the gear and fashion a plug out of a speedometer end, a dime and a round of EPDM sheet rubber or a bicycle inner tube.
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Old 06-11-2022, 08:53 PM   #3
John242Ti
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Quote:
Originally Posted by mike66 View Post
Hello, I’m about to swap a J type overdrive/ iron case M46 into my 89 745T to replace a bad P Type. My questions are, can I just weld the end of the speedometer drive shut, and does the speedo gear need to be in there or can I just toss it. Thanks in advance.

Remove the speedo drive housing and tap in a freeze plug.
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Old 06-11-2022, 08:59 PM   #4
planetman
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Volvo part for plugging the speedometer hole when a speedo cable isn't needed for a J O/D.

Costs about $20.00 and comes with a new o-ring.


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Last edited by planetman; 06-11-2022 at 09:14 PM..
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Old 06-11-2022, 09:19 PM   #5
mike66
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Nice! But wouldn’t it serve the same purpose as the speedo drive plug being blocked off and of course a new o-ring? Do you sell these plugs? Or is it a dealer item?
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Old 06-11-2022, 09:41 PM   #6
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We do sell them, but we don't stock them. Available from Volvo, part number 1220200.

You actually don't need to plug the original speedometer hole if you have and reseal the original speedometer housing and install a speedometer drive gear. The speedometer cable doesn't do anything when it comes to sealing this area.
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