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Old 09-28-2023, 06:19 PM   #1
Banditorama
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Default Speedometer worm gear play. What holds it in place?

I'm hoping this is the final chapter in my quest to get this GD speedometer working. I rebuilt my speedo, got it restickered and working. Worked fine on the bench, but not in the car. Spun fine running it off a drill via the cable, so I opened up the assembly on the transmission side

Gear were all in fine shape. But but the worm gear that rides on the driveshaft inside the torque tube can slide back and forth about 3/4". It's enough play that it doesn't engage the gear in the case assembly that drives the speedo cable

I couldn't feel/see anything behind it that would hold it in place. What is supposed to be there to hold it in place?

Is it the thrust washer that appears in the attached diagram?

From the images of it I've seen, it's nowhere near large enough to take up the amount of play I have.
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Old 09-28-2023, 06:54 PM   #2
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Default Re: Speedometer worm gear play. What holds it in place?

You may need more than one Drive gear spacer (thrust washer) to keep gear from moving back and forth.
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Old 09-28-2023, 08:31 PM   #3
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Default Re: Speedometer worm gear play. What holds it in place?

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You may need more than one Drive gear spacer (thrust washer) to keep gear from moving back and forth.
Is that a sign of some underlying issue or just is what it is?

I can't find the thickness of that thrust washer. But from the images I've seen, it seems like it would take several of them to take up 3/4" of play
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Old 09-28-2023, 09:14 PM   #4
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Default Re: Speedometer worm gear play. What holds it in place?

Is the retaining ring in place?
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Old 09-28-2023, 09:21 PM   #5
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Default Re: Speedometer worm gear play. What holds it in place?

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Is the retaining ring in place?
I'm 90% sure it isn't. I couldn't see it nor feel it back there. Unless it's jammed wayyy back inside the torque tube, I'm going to say no, it's not there
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Old 09-28-2023, 09:27 PM   #6
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Default Re: Speedometer worm gear play. What holds it in place?

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Quote:
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I'm 90% sure it isn't. I couldn't see it nor feel it back there. Unless it's jammed wayyy back inside the torque tube, I'm going to say no, it's not there
That's probably the problem snap ring missing agree, don't know the thickness!
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Old 09-28-2023, 09:43 PM   #7
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Default Re: Speedometer worm gear play. What holds it in place?

If it's just a thrust washer. Then, instead of pulling the rear end and torque tube to replace it, I should be able to just install a split collar clamp?
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Old 09-29-2023, 11:09 AM   #8
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Default Re: Speedometer worm gear play. What holds it in place?

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Originally Posted by Banditorama View Post
I'm 90% sure it isn't. I couldn't see it nor feel it back there. Unless it's jammed wayyy back inside the torque tube, I'm going to say no, it's not there
The retaining ring should be ahead of the drive gear so I don't think it could have got shoved back into the torque tube
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Old 09-29-2023, 11:22 AM   #9
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Default Re: Speedometer worm gear play. What holds it in place?

I just double checked and no, the thrust washer is not there. Also, my idea of using a split collar clamp won't work either. There's not enough space to slip one back there

Oh well, I guess pulling the rear end is another job for me in the near future.
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Old 09-30-2023, 07:05 AM   #10
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Default Re: Speedometer worm gear play. What holds it in place?

Clean the area really well with some carburetor spray cleaner and then use some Loctite adhesive. Loctite makes different adhesives for different applications. Find one that is for permanent fixing of bearings in bores. The adhesive will wick into the gap between the gear and the shaft. It will probably last for years that way.
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Old 10-08-2023, 10:37 AM   #11
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Default Re: Speedometer worm gear play. What holds it in place?

Neal, once again, you are the man!

Thank you for all your help. I applied the loctite on Friday and just got around to putting it all back together today. Speedometer is finally working. Heck of a lot easier than pulling the whole rear end out
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Old 10-08-2023, 07:13 PM   #12
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Default Re: Speedometer worm gear play. What holds it in place?

Happy to hear it worked for you.
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