kissedin

Hi.

I Have a 82' firebird trans am with 305 engine (carbs) and TH350 transmission.

My speedometer is giving me a reading that is around 27 - 30 % too fast.

I've looked in to changing gears but then I discovered that my odometer is correct.

1. Can i fix this issue with changing speedometer gears?
2. If my speedometer is broken, is there a way to repair/recalibrate it?

Any help greatly appreciated / Björn

Marine_Marauder

First things first,

Are you reading the MPH or the KM?





J/K

kissedin

I'm reading the KM/h. When i'm traveling in 50 km/h the meter shows 65. When i go in 80 the meter shows around 110.

My odometer is calibrated for km/h and seems to be accurate.

kissedin

Trying to bump this thread. Since I have a carburated engine (LG4) there is no VSS to take into consideration. It seems my only option is to replace the speedometer.

Or does anyone know a way to repair it? (I've checked my shopmanual but all it's saying about my problem is that the speedometer needs to be reparied. duh)

Any help greatly appreciated / Björn

Apeiron

Wouldn't matter if there was a VSS, if the odometer right then the problem is still in the speedo head mechanism.

No user-serviceable parts inside a speedometer. Pretty much has to go to a shop for remagnetization and recalibation.

kissedin

It wasn't the answear I was hoping for. But it is an answear. Thank you.

kissedin

For the record: According to the papers from "transportstyrelsen" a govt. authority in sweden my odometer should read kmh. But it does not. Before ordering a new speedo a checked with a GPS more thoroughly than I did before. My odo reads miles. And it reads around 23% too much. Next step is to find the right gears or simpy order an ratio adapter. Have posted this in the trans. part of this wonderful forum.

Marine_Marauder

I would try swapping out the instrument cluster. They're on Ebay all the time.