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#49247 08/19/2005 3:15 AM | Joined: Aug 2004 Posts: 47 Wrench Fetcher | | Wrench Fetcher Joined: Aug 2004 Posts: 47 | my old time retired mechanic says the reason my speedometer stopped working is that besides the speedogear teeth being rounded and worn, the main gear that it meshes with has come loose from the shaft. He doesn't see a crack in the gear, but he can turn it with a finger when it is in neutral. Thus his professional opinion.
does this sound right, or should I just replace the speedogear and hope it will work?
Don't really want to invest in having him yank the transmission etc., just to find out if I'm doing 38 or 45 mph.
and where does one find a 19 tooth speedogear, and possibly the other parts he needs for the bigger job?
Thanks,
Bart | | |
#49248 08/19/2005 4:24 AM | Joined: Jul 2003 Posts: 586 Shop Shark | | Shop Shark Joined: Jul 2003 Posts: 586 | Without seeing it, its hard to say. I would get a new cable and replace the old one first. Your going to need it anyway. You have nothing to lose. Cecil......... | | |
#49249 08/19/2005 4:52 AM | Joined: Aug 2004 Posts: 47 Wrench Fetcher | | Wrench Fetcher Joined: Aug 2004 Posts: 47 | thanks, but I replaced the cable first. thats not the issue. spinning the new cable manually works the guage... it's in the gear(s). | | |
#49250 08/19/2005 4:38 PM | Joined: Jan 2001 Posts: 5,337 'Bolter | | 'Bolter Joined: Jan 2001 Posts: 5,337 | The speedo drive gear is pinched between the rear trans bearing and the U joint front yoke. If the U joint mounting bolt comes loose and they do the speedo drive gear will spin free on the shaft and will not turn the speedo.
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#49251 08/19/2005 6:42 PM | Joined: Aug 2004 Posts: 47 Wrench Fetcher | | Wrench Fetcher Joined: Aug 2004 Posts: 47 | Ah...thats interesting.
My mechanic worked for Ford in the 50's, early 60's. he said the drive gear is sort of "heat shrunk"onto that shaft... and thus loosens only if the gear cracks. He didn't mention the Ujoint mounting bolt... maybe Chevu did things differently.
I'llpass this along to him.
Thanks very much. | | |
#49252 08/19/2005 9:17 PM | Joined: Jun 2005 Posts: 887 Shop Shark | | Shop Shark Joined: Jun 2005 Posts: 887 | IF the speedo gear is just loose, glue it back down! If you need a new speedo gear... maybe this place'll have 'em? http://www.tciauto.com/components/speedometer_gears.htm It looks from the diagrams on their page that most of the speedo gears have keyways, so your mechanic might be right...
'51 Chevy 1/2 ton w/'62 261, HEI, offy, fentons, dual carter/webbers, t-5 & 12 bolt posi
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#49253 08/19/2005 11:53 PM | Joined: Aug 2004 Posts: 47 Wrench Fetcher | | Wrench Fetcher Joined: Aug 2004 Posts: 47 | Thanks... will give them a try. | | |
#49254 08/21/2005 12:26 AM | Joined: Aug 2004 Posts: 13 Junior Member | | Junior Member Joined: Aug 2004 Posts: 13 | changing the speedo drive gear is not that hard. you don't have to pull the tranny, Just open the u-joint and pull the gear out the back of the tranny.
whoever worked on mine last put the gear back in the wrong place on the main shaft so my cable was'nt connected to anything. you can buy these gears used. If you can't find one, let me know. I have an extra. | | |
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