Speedometer gear replacement

[edison1970]

I ordered a new speedometer gear earlier this year because my speedometer was reading 10 mph over the actual speed.  I  was thinking it had the incorrect number of teeth.  Took the gear out tonight and it's the same one that I figured I needed. 27 inch wheel diameter,  323 gear.  (P255/60 R15)  It has a 32 tooth gear. Should I go to the 31?

[Chryco Psycho]

Is it 10 MPH over at all speeds ? If so the speedo gauge maybe the problem not the gear .
For example if you are 6 mph out @ 60 & 10 MPH out at 100 then you are off by 10% so change the amount of teeth by 10%

[edison1970]

It seems to be 10 mph across the board.  At 55 on the speedometer,  I'm actually doing 45. I checked it on my phone gps.

[Chryco Psycho]

sssssssssso I would suspect the speedo head , it might just need cleaning & lube

[DeathProofCuda]

sssssssssso I would suspect the speedo head , it might just need cleaning & lube

@Chryco Psycho - can you provide any direction on how to go about doing that, or is it something better left for a pro?

[Burdar]

To the OP...

While out on the road, use the mile markers to check your odometer.  If your odometer is reading correctly, then your speedo gear is correct.

[Chryco Psycho]

You would need to pull the gauges & remove the speedo from there it is not hard to clean it & lube the moving parts , you need a light oil like a sewing machine oil or a thin synthetic