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08-23-2021, 12:23 PM | #1 |
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Join Date: May 2010
Location: Maryville, TN
Posts: 491
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Speedo Drive Gear Question
I have a 29 Pickup and the speedo has not been working for some time. I pulled the cable off the gear case on the driveshaft and found the inner cable broken. A long time ago I put a 4.11 R&P in the truck and I could not remember if I changed the drive gear in the assembly so I pulled this and discovered I had the correct 21 tooth gear. I broke the gasket when reinstalling the gear case so I looked in Snyder's catalog and they sell a set of 3 gaskets so you can set the backlash on the gear. My question is - how do you determine the backlash and what is the correct number?
Thanks, Vic |
08-23-2021, 01:00 PM | #2 |
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Join Date: May 2010
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Re: Speedo Drive Gear Question
I fit one gasket while I tighten up the two retaining bolts I insert a small screwdriver into the female cap end . If the drive begins to lock with zero lash I put in a second gasket this normally does the trick . A little bit of lash is fine . When the drive begins to lock stop tightening the cap or damage to the housing can result , I have never had to use three gaskets . You need a medium screwdriver for the flagged female .
John in Suffolk County England . Last edited by john charlton; 08-23-2021 at 01:12 PM. |
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08-23-2021, 08:40 PM | #3 |
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Re: Speedo Drive Gear Question
John:
Thanks. Your answer makes sense. Vic |
08-24-2021, 08:42 AM | #4 |
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Location: Bucks Co, Pa
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Re: Speedo Drive Gear Question
Why did it break! My 29 has abut the same problem. But I found out that the speedo is very tight, not seized, but very tight. I tried oiling it and running it in with an electric drill, (Reverse) but no luck so far. I'm thinking of having Papanick do the rebuild. ($160 +).
Terry |
08-24-2021, 09:31 AM | #5 |
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Location: Maryville, TN
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Re: Speedo Drive Gear Question
Terry
I don't have the speedo out yet because I found the broken cable. It is probably a good thing to check out the speedo before I put in the new cable. My speedo has 72K miles on it and I do not want to put in a rebuilt one with zero miles on it. Last week I sent an e-mail to papanick but have not heard a response. Thanks for the advise. Vic |
08-24-2021, 10:25 AM | #6 |
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Re: Speedo Drive Gear Question
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John in Suffolk County England . |
08-24-2021, 11:25 AM | #7 |
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Location: Spring Grove, Illinois
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Re: Speedo Drive Gear Question
Rebuilders don't have to turn the odometer back to zero fyi.
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