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Old 12-03-2021, 01:40 PM   #1
mike in mo
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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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Old 12-03-2021, 02:33 PM   #2
Wgesnerjr
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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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Old 12-03-2021, 03:03 PM   #3
Just call me Sean
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Re: speedometer trouble

Yes that's the reason. 89 is electric.
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Old 12-03-2021, 07:09 PM   #4
Corts60
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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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Old 12-04-2021, 12:20 AM   #5
mike in mo
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Re: speedometer trouble

my 87 crew cab is electric. did they use both?
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Old 12-04-2021, 12:44 AM   #6
Just call me Sean
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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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Old 12-04-2021, 01:30 AM   #7
roboticjunky
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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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Old 12-04-2021, 01:33 AM   #8
roboticjunky
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Re: speedometer trouble

Here's what I was talking about.
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Old 12-05-2021, 01:58 PM   #9
THI
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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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Old 12-06-2021, 08:35 PM   #10
Pontiac1976
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Re: speedometer trouble

Quote:
1989 was still cable driven so 1981-1987 will work. 1990 went to VSS driven because of the Rear ABS.
THI is got the years right.

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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