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Anyone Having/Had Speedometer Issues?

Messages
2
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0
Location
Porter, Texas
Thread starter #1
I've been driving my 1994 Chevy C1500 W/T now since early 2012. I just rolled 417000 miles with the original 4.3L V-6. I'm on my 3rd Getrag NV3500 5-speed transmission, the one it came with, the used one I put in it, and finally, the rebuilt that's still going strong. I've put a set of Good Years about 40000 miles ago, P235 75 R15. Since day one, the speedometer has been off. At slower speeds, it's pretty close but the faster I go, the farther off it reads. As an example, speedo reads 40 mph, I'm going 35 mph. When speedo reads 75 mph, I'm going 55 mph. Once the speedo is buried, I'm just keeping up. Anyone have any ideas or suggestions?
 

WarWagon

Well it hits on 7 of 8...
Messages
8,704
Likes
3,441
Location
AZ
#3
Did the trans rebuild bring on the problem? Like too many teeth on the pickup wheel. Different wheels and tires than stock? Bad Grounds are famous for issues.
 
Messages
2
Likes
0
Location
Porter, Texas
Thread starter #4
Problem was there before trans rebuild. Tag inside door calls for P225 75 R15 where I have P235 75 R15. I never thought about a grounding issue. Now that you mention grounding, I think of the other speedo issue. Cruising down the freeway, I hit the turn signal & the speedo slams over to 0 for a second & back again. It's been doing this so long that I just ignored it. Definitely something to look in to.
 
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