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#1 |
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![]() Join Date: Apr 2017
Location: Boise, ID
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My truck’s speedometer has never worked. A while back I pulled the old cable out and it had broken apart and someone had removed the pieces, so all I had was a portion of it. I ordered a new cable from Rock Auto that was 38” long and it was way too short, so I measured the housing like I should have from the beginning and ordered the next size up, 63” long. That length is too long by roughly 5”. Does anybody know what length speedometer cable I need? Is this something if I go to the old guy at NAPA he can probably help me with? I’m a little confused because LMC (I know they aren’t the best) says it should be one of those two lengths, but nobody seems to have a length in between those two.
It’s a 1968 C20 with an NP435 transmission. I’m guessing the transmission is why I’m having a hard time finding the right length of speedometer cable. Thanks in advance for any help.
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1968 GMC C2500 Long Bed Fleetside |
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#2 |
Old member
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Location: Liberty, & Garden City S.C. , U.S.
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I just ordered a cable from O-Reilly's but I got the longest one they showed at 112" because I installed a 700-R4 in it.
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1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 ![]() Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs. |
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#3 | |
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Join Date: Dec 2017
Location: Elkhart, Texas
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Re: 1968 GMC Speedometer Cable Help
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#4 | |
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Re: 1968 GMC Speedometer Cable Help
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1968 GMC C2500 Long Bed Fleetside |
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#5 | |
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Re: 1968 GMC Speedometer Cable Help
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#6 |
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Re: 1968 GMC Speedometer Cable Help
One end is square to fit into the transmission and the other end has a “nock” on it. I’m not sure what purpose the nock serves, I figured it was for the speedometer.
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1968 GMC C2500 Long Bed Fleetside |
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#7 |
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Location: Liberty, & Garden City S.C. , U.S.
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The speedometer cable shouldn't go through the frame. I just pulled 2 of them. One out of the LWB frame trans and one out of the SWB and neither one goes through the frame.
The e brake cable does go though the frame right under the drivers floor and it look's a lot like a speedometer cable. The speedometer cable does not go through the frame on any of these model trucks that I have ever seen. Here is a thread on the speedometer routing. ![]() http://67-72chevytrucks.com/vboard/s...d.php?t=445001
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1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 ![]() Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs. |
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#8 | |
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Re: 1968 GMC Speedometer Cable Help
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1968 GMC C2500 Long Bed Fleetside |
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#9 |
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Location: Gods country East,Tn
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Re: 1968 GMC Speedometer Cable Help
You can measure and cut the longer cable to use as a replacement and buy one of these cheap universal kits to swedge a bead on the speedometer side .
![]() https://www.ebay.com/itm/Universal-S...-/142957131769 https://www.ebay.com/itm/Dorman-9-18...cAAOSwBahU4S3r
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![]() 1967 Factory short bed - Old school '71 - 350 / 4bolt / 487 heads / Edelbrock C3BX Muncie M-22 4 speed / Hurst Comp plus Factory 12 bolt posi 3.73 / 255-70-15 Smoothed firewall / Factory cowl induction Power disc brakes / power steering / 3.5-5" drop Last edited by Grumpy old man; 02-08-2020 at 12:05 PM. |
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#10 | |
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Re: 1968 GMC Speedometer Cable Help
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1968 GMC C2500 Long Bed Fleetside |
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#11 |
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Re: 1968 GMC Speedometer Cable Help
I have the same transmission, and just bought a speedo cable a couple weeks ago, Let me go grab the package to see where I bought it,
Dont get a longer than needed cable.
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1968 C20 Fleetside 396 4sp PS PB AC CST . https://www.youtube.com/watch?v=RWK8GgWD4uA |
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#12 |
Old member
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Location: Liberty, & Garden City S.C. , U.S.
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Mine came today and I had to take it back. It worked but was way to long by about 30". I took it back out and pulled it to where I needed it. 65" total. I went back to O-Reilly's and we found one at 63", it should work it will be here tomorrow. I'll post once I get it and see how it fit's. If it's 5" to long it should be fine you don't want it to have any sharp bends.
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1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 ![]() Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs. Last edited by Andy4639; 02-08-2020 at 08:56 PM. |
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#13 | |
Old member
Join Date: Jan 2002
Location: Liberty, & Garden City S.C. , U.S.
Posts: 19,936
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__________________
1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 ![]() Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs. |
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#14 |
Registered User
![]() Join Date: Apr 2017
Location: Boise, ID
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Re: 1968 GMC Speedometer Cable Help
Thanks all, I appreciate the help! Astro-Balls, that might be exactly what I need!
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1968 GMC C2500 Long Bed Fleetside |
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#15 |
Old member
Join Date: Jan 2002
Location: Liberty, & Garden City S.C. , U.S.
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63" cable with housing worked perfectly. I would have liked a 65" but the 63" is fine. That's a 700-R4 also.
First picture is box from O-Reilly's auto. Last picture is e brake coming through the frame under the drivers side. ![]()
__________________
1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 ![]() Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs. |
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#16 |
Registered User
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Location: Nor Cal
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Re: 1968 GMC Speedometer Cable Help
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1968 C20 Fleetside 396 4sp PS PB AC CST . https://www.youtube.com/watch?v=RWK8GgWD4uA |
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#17 |
Registered User
Join Date: Oct 2017
Location: Hudson Valley, New York
Posts: 643
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Re: 1968 GMC Speedometer Cable Help
An older thread, but very helpful in locating Speed-O-Cable for my '68 (C20 396, w/NP435 trans).
Attached pic of OER one that AstoBalls linked, along with what I ordered. I did end up ordering from Ebay (since I found a 70" with metal housing). Brand: Fargo Automotive Mfg. PN: 47-17260-MH
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'68 C20 Utility 396 4sp (BuildThread: http://67-72chevytrucks.com/vboard/s...d.php?t=806904 ) '68 C10 50th |
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