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12-03-2021, 01:40 PM
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#1 |
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Registered User
Join Date: Jul 2005
Location: centralia missouri
Posts: 123
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speedometer trouble
im trying to buy a new speedometer for my 1989 gmc suburban but all the aftermarket places stop at 1987 when i ask them most say they have no idea if it will work in a 89 or not .
anyone know of a replacement that works or is the 1987 listed the one that works up to the 1991 body change? |
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12-03-2021, 02:33 PM
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#2 |
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Senior Member
 
Join Date: Jun 2015
Location: Atlanta, GA.
Posts: 737
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Re: speedometer trouble
It may be that Chevy switched from cable over to electric. Not sure what year that happened but that may be the reason.
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Jay Gesner Atlanta, GA 1985 C10 Long Bed 4X2 LS 5.3, 4L60E Father/Daughter Project |
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12-03-2021, 03:03 PM
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#3 | |
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Registered User
Join Date: Jun 2014
Location: Orlando Florida
Posts: 1,598
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Re: speedometer trouble
Yes that's the reason. 89 is electric.
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12-03-2021, 07:09 PM
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#4 |
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Just here to tinker
Join Date: Jun 2008
Location: Holland, MI
Posts: 3,697
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Re: speedometer trouble
88 is the last year of cable driven I believe. At least my 88 Suburban is cable driven anyways.
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78 C10 SWB Diesel #1 (wrecked)http://67-72chevytrucks.com/vboard/s...1978+silverado 78 C10 SWB Diesel #2 (sold)http://67-72chevytrucks.com/vboard/s...d.php?t=650751 60 GMC Suburban (sold)http://67-72chevytrucks.com/vboard/s...d.php?t=445526 60 GMC 1000 (sold)http://67-72chevytrucks.com/vboard/showthread.php?t=298235 67 GMC 1500 (sold) http://67-72chevytrucks.com/vboard/s...d.php?t=803695 73 Chevy C20(Daily)http://67-72chevytrucks.com/vboard/s...d.php?t=852767 86 Suburban(summer unit) http://67-72chevytrucks.com/vboard/s...d.php?t=810697 88 Suburban 4x4(sold) |
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12-04-2021, 12:20 AM
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#5 |
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Registered User
Join Date: Jul 2005
Location: centralia missouri
Posts: 123
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Re: speedometer trouble
my 87 crew cab is electric. did they use both?
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12-04-2021, 12:44 AM
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#6 | |
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Registered User
Join Date: Jun 2014
Location: Orlando Florida
Posts: 1,598
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Re: speedometer trouble
I thought 87 and up is electric, because they're fuel injected so the computer also gets the signal.
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12-04-2021, 01:30 AM
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#7 |
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Registered User
Join Date: Oct 2015
Location: IN
Posts: 209
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Re: speedometer trouble
My 87 was cable driven, but there was a speed sensor built into the back of the speedo. Then the wires went to the VSS buffer and then to the ECM since the truck came with TBI.
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12-04-2021, 01:33 AM
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#8 |
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Registered User
Join Date: Oct 2015
Location: IN
Posts: 209
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Re: speedometer trouble
Here's what I was talking about.
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12-05-2021, 01:58 PM
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#9 |
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Active Member
Join Date: Jan 2017
Location: Traverse City, MI
Posts: 196
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Re: speedometer trouble
1989 was still cable driven so 1981-1987 will work. 1990 went to VSS driven because of the Rear ABS.
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12-06-2021, 08:35 PM
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#10 | |
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Registered User
Join Date: Oct 2015
Location: Ottawa, Ontario, Canada
Posts: 780
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Re: speedometer trouble
Quote:
But it not unheard of the very late last of the run on the line having a few changed early to the new part some times when they short the old ones.
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 1977 REG cab Long Bed with a 1984 Front Clip, 82 305 .60 over 9.0.1 flat top pistons, 4bbl, TH350, w/84 SS-intake & cam , w/ 1977 big block rad, 1975 gear box, 1984 master w/ metric fittings top & SAE fitting @ portion block, 1975 3.42 gear open diff. Duel 77-87 Factory air cleaner, duel inlet from rad support . Down sized 9' to new 8' Steel flat bedWas a 77 454 w/308 gear. Taken out 550 lbs. up front with motor clip change. Last edited by Pontiac1976; 12-06-2021 at 08:42 PM. |
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