Author Topic: Non working speedo  (Read 5043 times)

Offline Chevygold

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Re: Non working speedo
« Reply #15 on: January 14, 2021, 03:16:35 PM »
Just checked Amazon and both come up currently unavailable so guess they don't ship to UK?
Graham.

Offline frotosride

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Re: Non working speedo
« Reply #16 on: January 14, 2021, 04:19:20 PM »
Yeah that could be a problem... now I know what the shipping issue is...toooo far away! I did enjoy a lot of good food in Scotland last fall. Didn't see any squar body Chevys that far north.
"Beat it like a red-headed ford"
1987 v10 Silverado(LQ4), 87 R10,83 K20, 83 cucv 6.2 Detroit
2006 Boulevard M109R 109 cid,2019 M109R BOSS
2009 Jeep XK, (future LS Swap)
GSXR 750 engine awaiting go kart

Offline Chevygold

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Re: Non working speedo
« Reply #17 on: January 16, 2021, 09:03:48 AM »
Yes, managed to order one from Canada, really good price but with the shipping and tax just over 30 bucks but that's the price to pay for a fun truck in the UK!
There's a nice 50's Chevy truck I see cruising around and we have an early 70's C10 in our club and all long beds like mine, obviously carrying lots of stuff worth more than pose value!
Graham

Offline frotosride

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Re: Non working speedo
« Reply #18 on: January 25, 2021, 07:55:05 AM »
$30 ain't to bad for the distance. And you will have a relic over there. Do people stalk you guys trying to buy your trucks?

I ask because it happens here, specifically to me a lot, and old Chevys aren't  as scarce in the states.
« Last Edit: January 25, 2021, 06:38:42 PM by frotosride »
"Beat it like a red-headed ford"
1987 v10 Silverado(LQ4), 87 R10,83 K20, 83 cucv 6.2 Detroit
2006 Boulevard M109R 109 cid,2019 M109R BOSS
2009 Jeep XK, (future LS Swap)
GSXR 750 engine awaiting go kart

Offline Chevygold

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Re: Non working speedo
« Reply #19 on: January 25, 2021, 08:24:01 AM »
Not quite stalk but it gets lots of looks and admiring comments so hopefully I wouldn't have much of a problem moving it on if the need arises say if a fifties 3100 comes my way?
Graham

Offline Chevygold

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Re: Non working speedo
« Reply #20 on: April 08, 2021, 04:27:24 PM »
OK update on the speedo issue, well my initial smugness came to naught as the speedo gear I ordered made it as far as Ireland but has now vanished into a black hole, found another which arrived after just over a week so here goes!
Took out the original body and compared it with the one for the smaller gear and the difference is the position of the axis of the driven gear shaft so that the smaller gear alligns with the drive gear so that's the difference.
Fitted the new set up and seems to be about right but I now have a new problem, after driving about for a bit the odometer got to --399 miles and stopped there, couldn't quite crank over to the --400 and there it has stayed so next question, are the odometer gears available to repair it or do I need a new speedo head?
Thanks
Graham

Offline frotosride

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Re: Non working speedo
« Reply #21 on: April 10, 2021, 05:55:21 PM »
Never messed with them honestly plus it's against the law to change odometer readings. New speedo may help. Honestly I'd take it apart especially since I've never done it before
"Beat it like a red-headed ford"
1987 v10 Silverado(LQ4), 87 R10,83 K20, 83 cucv 6.2 Detroit
2006 Boulevard M109R 109 cid,2019 M109R BOSS
2009 Jeep XK, (future LS Swap)
GSXR 750 engine awaiting go kart

Offline Chevygold

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Re: Non working speedo
« Reply #22 on: April 15, 2021, 04:24:19 PM »
I hoped that the odometer drive gears might be available as they are for my Corvette but couldn't find any on line, the speed still works fine and feels about right although I haven't checked with my speedo app yet.
Just spent the last 2 days sorting out my sloppy steering column, wasn't too bad although I made a couple of errors which meant it took a bit longer to complete the job, fixed my horn as well while it was all apart so double success, lost my indicators in the process but found it was just a blown fuse! Will have to see how it drives now, should feel better with the slop gone.
Graham

Offline Chevygold

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Re: Non working speedo
« Reply #23 on: January 16, 2022, 09:27:02 AM »
Stripped out the gauge and gave the tumblers a good dose of WD40 and eased them past the 400 mile point and so far they're turning over OK although not been putting many miles on due to Covid restrictions so have to keep my fingers crossed still haven't checked the speedo yet for accuracy, working through brakes and front suspension at the moment so could be a while as waiting for parts to arrive.
Graham.

Offline Mr Diesel

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Re: Non working speedo
« Reply #24 on: January 16, 2022, 03:27:56 PM »
Giving everything a good lube is the right place to start with the gauge.

Hopefully it will be accurate on speed. Those online speedo calculators really are about worthless these days since these speedometers are so old. The calculator is only as good as the parameters you plug in, plus they assume your 40+ year old speedo magnet hasn't weakened. Fyi these old GM speedos work on a rotating magnetic assembly. As the magnet gets old it loses strength, losing accuracy and rendering speedo calculators useless since you cannot account for that variable. If you aren't on the money for speed just order a variety pack of the colored gears for transmission so you can just swap through them until accurate. There are other factors to consider, but I have found each gear generally changes speed by about 2 mph.
1976 C20 Crewcab, 6.2L/SM465
1982 K30 Crewcab , 427TD/TH400
1983 C30, 6.2L/TH400
1983 K30 Crewcab 454/700R4
1986 K10 350/400. 1989 K30 cab/chassis 454/SM465

Offline Chevygold

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Re: Non working speedo
« Reply #25 on: January 31, 2022, 07:52:53 AM »
Thanks Mr Diesel, still not checked with gps but feels about right, just have to make sure it doesn't under read, in the middle of rebuilding front suspension and brakes now the weather is dry for a spell.
Graham

Offline Chevygold

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Re: Non working speedo
« Reply #26 on: February 03, 2022, 11:29:08 AM »
OK finally did a speed check and it was spot on so can mark that off as a success, I only went to 60 as we don't have any motorways anywhere near me but it was good all the way there.
Rebuild of one side front suspension was a success too, just have to do the other side now but having a rest from the truck for a while as our camper needs a bit of TLC ready for this season.
Thanks
Graham