After about 10 or 12 miles travel it still moves up and down when you increase or reduce speed but it is sluggish and moves back and forth over a range of 5 to 10 mph depending on speed the highier your speed the wider the range. I feel that it is in need of lubrication wanted a second opinion.
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put on lift and follow speedometer wire down back behind engine and just unscrew. The should stop it from working. You probably want to replace the speedometer by removing trim then unscrewing bolts/screws until you can remove the cluster panel. remember to remove all the stuff attached to back of it. then unbolt speedometer and install new one, but remember in some states that has to be done by a state certified person that would set it to the old amount of miles traveled. Someone had done it without setting it for current miles traveled and sold it to our Police Department and it was determined that the cars had 300,000 miles on it and not 5,000 so they were set to jail.
In most cars especially those older models, the speed sensor for the speedometer is located in the transmission. Check for physical wear on the cable that leads from the transmission to the back of the dashboard. If you have increased the size of the tires dramatically, the actual car speed would be slower then the speedometer. Either the components responsible for measuring speed (speed cable, dashboard, speedsensor) is damaged or tire size or transmission parts or the transmission itself was replaced.
2005 BUICK LESABRE TACHOMETER DOES NOT REGISTER WHEN ENGINE IS RUNNING. SOMETIMES IT BARELY MOVES, THEN GOES BACK TO 0
SAME CAR HAD SPEEDOMETER QUIT, REPLACED WITH NEW SENSOR, DROVE ABOUT 1300 MILES AND IT QUIT AGAIN. CLEANED THE SENSOR, WORKS OK NOW.
If the gears have been INCREASED the speed etc will be less.
Say it's increased by 18%.In theory,at 100mph real speed, the speedo will read 18%less.i.e. 82mph.
If the speedo is driven off the g/box,all this has to be taken into account.
If the speedo is driven off the wheels(and the wheels have not changed at all)All that will happen is the engine revs will have decreased by 18%.
So,To work out the difference.Divide the distance travelled by 100 and then multiply the answer by 82.(82 is the remaining % of the original)
So if 150 miles is divided by 100=1.5
1.5 is multiplied by 82=123 miles.
Hope this helps
Thsi is likely a problem inside the speedometer guage internally with the driven gears. They use drive motors to drive the needles inside. If it is pretty continuous then the speedometer is in trouble and will require a speedometer specialist to rebuild the unit or replacement of the unit.