Gauge Cluster/ Speedo Question

[eightyfivegn]

Having troubles with the speedometer reading about 10-12 mph too fast. I just put in a new transmission,so I'm confident it's nothing there but I could be wrong. Anyone have this problem? Stock wheels and tires on the car as well.

 

[eightyfivegn]

Anyone?

 

[aminga]

Wrong speedo gear?

 

[novaderrik]

check the gears in the trans.. i bet it's calibrated for 3.73 gears or something..

 

[mikestertwo]

Do you have the stock 85 mph speedometer or the 145 mph overlay on it? At what speed is it 10-12 mph off?

 

[novaderrik]

Do you have the stock 85 mph speedometer or the 145 mph overlay on it? At what speed is it 10-12 mph off?

and how did you verify that it's off?
is the odometer also reading fast- 10-12 mph error at 60mph would mean that the odometer will show 1.2 miles or so against a measured mile on the highway..

 

[TurboTGuy]

Any reputable speedo shop can correct that problem at a reasonable price.

I'm just sayin' you're not likely to find a Speedo guy on this forum. Even if you do, you're on your back , then your streched out over the engine bay messing with stuff you obviously know nothing about. (It's a 2 piece speedo cable)

I just had a 140 Canadian KMH speedo converted to 140MPH and installed on my car with a one piece cable for less that $225. (Not including the Canadian speedo) Total was less than $400. This stuff looks absolutely factory.

The guy even set up my odometer to within 20 miles of the original and gave me documentation to show the State and any potential buyer (like I'll ever sell it....) that all of it was done correctly and legally.

I'm not questioning your skills, I'm just stating a fact.

Go pay somebody $75 bucks and lose the headache. Why do Buick guys always make everything such a chore?