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| | | | Joined: Jul 2013 Posts: 388 'Bolter | | 'Bolter Joined: Jul 2013 Posts: 388 | So fellas, In my efforts to get a speedometer working in my 54' Chevy 3100 (original 235 and 3-on-the tree and transmission), I've come across a few things.
1) Hoping for a quick fix I thought it might be the cable... its not. Old one spins just fine.
2) took the gauge itself out... it was all sorts of frozen up, but I got it freed up and it spins and reads (when hand turning the gauge/cable)
3) Took it for a spin and it still doesnt read the speed... so my next guess is that its the speedometer gear IN the tranny.
That what it sounds like to you? Whats involved in getting this fixed? Can I do it while the tranny is under the car? Any and all help will be greatly appreciated! | | | | | Joined: Feb 2002 Posts: 12,029 Cruising in the Passing Lane | | Cruising in the Passing Lane Joined: Feb 2002 Posts: 12,029 | first try this: disconnect the cable at the speedo, take it for a drive, reach under and feel if the cable insert is turning or not
Bill | | | | | Joined: Jul 2013 Posts: 388 'Bolter | | 'Bolter Joined: Jul 2013 Posts: 388 | Just checked. The cable insert does NOT turn at all when driving.
Last edited by GMJager; 07/28/2013 7:22 PM.
| | | | | Joined: Feb 2002 Posts: 12,029 Cruising in the Passing Lane | | Cruising in the Passing Lane Joined: Feb 2002 Posts: 12,029 | providing it has the correct shaped end to mate with the driving gear, then you're up for removing the gear - see shop manual hereBill | | | | | Joined: Apr 2008 Posts: 899 'Bolter | | 'Bolter Joined: Apr 2008 Posts: 899 | Make sure the cable is engaging the drive gear, could be too short.
Ed
| | | | | Joined: Apr 2005 Posts: 2,832 'Bolter | | 'Bolter Joined: Apr 2005 Posts: 2,832 | One last check is to jack up the rear and put some GOOD jackstands under the axle tubes. Start, put in high gear and put your finger on the shaft with the square hole the end of the cable fits into. If it's not turning there then pull the plug out and check both the gear there and the one inside the trans. Sometimes one lucks out and only the driven gear is bad but since I don't have a horse shoe in my butt it's usually the inside one or both.
Evan
| | | | | Joined: Jul 2013 Posts: 388 'Bolter | | 'Bolter Joined: Jul 2013 Posts: 388 | So I haven't jacked it up and put it in gear to check it yet, but I did pull the "Speedometer Driven Gear", the plug where the cable attaches to the side of the transmission View 1 View 2 | | | | | Joined: Jul 2013 Posts: 388 'Bolter | | 'Bolter Joined: Jul 2013 Posts: 388 | Anyone think that looks right? I've never done transmission work so I really don't know. Thanks fellas (and ladies) | | | | | Joined: Sep 2001 Posts: 29,269 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,269 |
Looks to me that the teeth are stripped?
| | | | | Joined: Jan 2013 Posts: 1,384 Shop Shark | | Shop Shark Joined: Jan 2013 Posts: 1,384 | The nylon gear is missing.
It was pressed onto the shaft.
Either split in half or was pulled off.
You need a new assembly.
Last edited by Jim Sears; 08/05/2013 1:58 PM.
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