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98 Chevy Silverado speedometer
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thendrix View Drop Down
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Joined: 04 Feb 2013
Location: Fairmount GA
Points: 5055 		Post Options Post Options   Thanks (0) Thanks(0)   Quote thendrix Quote  Post ReplyReply Direct Link To This Post Topic: 98 Chevy Silverado speedometer
    Posted: Yesterday at 10:59am
My mama has a 98 Silverado and the speedometer is WAY off. Washing around the driveway it reads 90 to 100 and after stopping it sits on 100. Any thoughts? It's a 5.7 auto. I'm guessing either a 4L60E or maybe 4L80 transmission?

Edited by thendrix - 22 hours 60 minutes ago at 11:00am
"Farming is a business that makes a Las Vegas craps table look like a regular paycheck" Ronald Reagan
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ekjdm14 View Drop Down
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Joined: 20 Aug 2024
Location: Manchester UK
Points: 938 		Post Options Post Options   Thanks (0) Thanks(0)   Quote ekjdm14 Quote  Post ReplyReply Direct Link To This Post Posted: 22 hours 37 minutes ago at 11:23am
Does the gauge reset cycling the key off/on? Back to zero OK if it does?

First thought would be bad electrolytic capacitor somewhere in the cluster, if the gearbox is behaving OK. The "capacitor plague" is usually cited as >99-07 but my experience says surface mount electrolytics from about '93 to about 2000 were actually the worst.

Otherwise, I've heard Chevys suffer with stepper motor failure in the clusters but not sure which years/models were affected. No direct experience since they're kinda rare in the UK lol
Stuck Farmer
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thendrix View Drop Down
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Points: 5055 		Post Options Post Options   Thanks (0) Thanks(0)   Quote thendrix Quote  Post ReplyReply Direct Link To This Post Posted: 20 hours 44 minutes ago at 1:16pm
If I remember right the needle was on zero when I got in the truck but I don't remember paying attention. I would like to think if it wasn't on zero I would have noticed I hope
"Farming is a business that makes a Las Vegas craps table look like a regular paycheck" Ronald Reagan
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Joined: 04 Jun 2017
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Points: 366 		Post Options Post Options   Thanks (0) Thanks(0)   Quote iowallis Quote  Post ReplyReply Direct Link To This Post Posted: 13 hours 2 minutes ago at 8:58pm
My daughter had a 2000 Chevy Cavalier that the gauges started to fail. Speedo would read 110 when doing 30, pegged the needle doing 55. Gas gauge all over the place as far as fuel level.

Found out GM products from this era use poor quality “stepper motors” for the gauges that were known to fail after about 15-20 years. Found a business on eBay that repairs them . Sent the gauge cluster to them and within a week I had it back, reinstalled it and no issues after that. Think it cost me about $75.00.

I am taking a guess that your gauge stepper motor is failing.       

Edited by iowallis - 12 hours 59 minutes ago at 9:01pm
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Points: 2425 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Codger Quote  Post ReplyReply Direct Link To This Post Posted: 3 hours 22 minutes ago at 6:38am
Yazaki North America vendored to the OEM's for many years and probably still do. They would have made the instrument clusters for most any GM product in the last 40 years or so:


They had a warehouse in Bloomington, IL and I used to pick up both new, and rebuilt clusters for OEM dealerships all over the midwest.

Many times it's not the design engineering that is at fault or failure. It is the cost, and marketing constraints placed upon the design(s) that cause failure. 
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thendrix View Drop Down
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Points: 5055 		Post Options Post Options   Thanks (0) Thanks(0)   Quote thendrix Quote  Post ReplyReply Direct Link To This Post Posted: 1 hour 25 minutes ago at 8:35am
Originally posted by iowallis iowallis wrote:

My daughter had a 2000 Chevy Cavalier that the gauges started to fail. Speedo would read 110 when doing 30, pegged the needle doing 55. Gas gauge all over the place as far as fuel level.

Found out GM products from this era use poor quality “stepper motors” for the gauges that were known to fail after about 15-20 years. Found a business on eBay that repairs them . Sent the gauge cluster to them and within a week I had it back, reinstalled it and no issues after that. Think it cost me about $75.00.

I am taking a guess that your gauge stepper motor is failing.       


This sounds familiar. Dad drove it this way for a little while before he passed and I think mama figures, no more than she drives it, it's not a big deal. She's probably right but it would bug me to no end
"Farming is a business that makes a Las Vegas craps table look like a regular paycheck" Ronald Reagan
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