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Keeping your resto going

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Don't

Irwin Arnstein working on his
1959 Chevy 1-Ton


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#1434668 Fri Dec 24 2021 10:40 PM
Joined: Oct 2006
Posts: 14
R
'Bolter
I have a 41 GMC. Stock 4 speed. Got it all back together and took it for a drive. The speedo doesn't work and the odometer runs backwards........ What did I do wrong???

retiredlafd #1434670 Fri Dec 24 2021 11:05 PM
Joined: Mar 2010
Posts: 10,150
5
'Bolter
Did the speedometer ever work properly before?

retiredlafd #1434672 Fri Dec 24 2021 11:22 PM
Joined: May 2015
Posts: 5,616
Housekeeping (Moderator) Making a Stovebolt Bed & Paint and Body Shop Forums
Speedometer drive gear in backwards in the tranny taillshaft?


Kevin
Newest Project - 51 Chevy 3100 work truck. Photos [flickr.com]
#2 - '29 Ford pickup restored from the ground up.
First car '29 Ford Special Coupe
Busting rust since the mid-60's
52Carl #1434674 Sat Dec 25 2021 12:07 AM
Joined: Oct 2006
Posts: 14
R
'Bolter
Speedo cable was not hooked up when I got truck. I have had the trans out and the tail shaft off. Didn't know I could put it in backward.

retiredlafd #1434691 Sat Dec 25 2021 04:49 AM
Joined: Apr 2002
Posts: 2,087
F
Fox Online
A teacher, but always an apprentice.
Are you driving in reverse, you showoff? 😉


In the Stovebolt Gallery [stovebolt.com]
More pictures here [photos.app.goo.gl]

1951 GMC 9430 1 ton dually—-Shiny!

1970 Chevrolet C10 - Grandpa’s- My first truck.—in progress to shiny
1972 Chevrolet C20- Rusty- the puzzle box lid for the C10.
1950 Chevrolet 1300- in progress to shiny.
1962 AMC Rambler American- my wife’s

Parts trucks-
1951 GMC 9300
1951-GMC 9430
1951- Chevrolet 1300
retiredlafd #1434723 Sat Dec 25 2021 05:56 PM
Joined: Mar 2014
Posts: 2,998
J
'Bolter
Honestly most of the time I've seen this is because somebody at some time installed the wrong speedometer drive gear. Some point one way and others point the opposite way.


Jon

1952 1/2 ton with 1959 235
T5 with 3.07 rear end
retiredlafd #1434743 Sat Dec 25 2021 10:51 PM
Joined: Feb 2004
Posts: 24,733
H
Kettle Custodian (pot stirrer)
If you disconnect the speedometer cable at the transmission and look at the end of the gear that drives the cable, it should be turning clockwise as the wheels turn in a forward direction. Jack up one rear wheel and either have someone spin the wheel by hand or let the engine idle in 1st. gear. If the gear is turning the proper direction, try the same check by disconnecting the speedometer cable inside the cab. There might be a speed change gearbox somewhere between the transmission and the dash that is assembled incorrectly.
Jerry


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retiredlafd #1434752 Sun Dec 26 2021 03:32 AM
Joined: Mar 2010
Posts: 10,150
5
'Bolter
Is there any indication that the speedometer has been rebuilt? The last time I had one open, it looked like that it is possible to reassemble it incorrectly. I do not know if that will make it go backwards.

retiredlafd #1434764 Sun Dec 26 2021 01:04 PM
Joined: Jan 2001
Posts: 5,223
P
'Bolter
Is the speedo cable attached to the drivers side?
If I remember correctly the driven gear can be installed to come out either side of the transmission. If the cable is attached to the passenger side it will turn the speedo backwards.


See the USA in your vintage Chevrolet!
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Pre '68 Dave #1434816 Mon Dec 27 2021 12:58 AM
Joined: Oct 2006
Posts: 14
R
'Bolter
Thanks, Ill try this first. I is on the pass. side


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