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If speedometer itself is working then gears inside the assembly are damaged.
The speedometer in a car runs based off the speed of the transmission. The gears in the transmission spin at a known rate for the speed the vehicle is traveling at. The faster the gears spin the more the speedometer goes up. If a person replaces stock tires with larger tires, then the tires will spin slower, which will cause the speedometer to read at a value that is less than the actual speed.
sounds like the speed sensor. it sends a signal to both the speedometer and the transmission
There are different sized gears that install in the transmission to fix your problem. Follow the speedometer cable down to the transmission. Unscrew it. There will be one bolt that holds the gear in place. Remove it and take out the entire unit. Different gears are different colors. You'll probably have to experiment to figure out which one you need. Some parts stores and most dealers carry these gears.
http:/www.tciauto.comTCI has drive gears, driven gears & calculators.
Transmission gears? In the transmission.
One can purchase Ford Aspire Spider gears directly through the Ford dealership. These parts can also be purchased at auto part stores.
It's inside the transmission (between the engine and the gears).
Gears is what transmission is for. No gears. No transmission!
More than likely there is a speedometer gear on your transmission that has a cable leading to the speedometer. These thiongs go out as they are usually driven from the gears in the tranny via plastic gears in the module. It is not hard to remove-one or two small bolts and it should slide right out. Their also very cheap to buy and replace. Good Luck!
If the odometer is not working but the speedometer is still indicating speed, the most likely fault is a set of small plastic gears inside the speedometer instrument itself. I have seen these gears available for sale at various BMW parts specialists. Removing the dash cluster for access to the speedometer is not difficult in a 1987 E30 car. With the cluster on the bench, you can repair the speedometer gears or replace the whole thing. Used speedometers are plentiful at on-line auction sites such as eBay.
If the gears are clunking in the transmission, this is a transmission problem in a 1998 Dodge Grand Caravan. The fact that the speedometer went up and back down suggests that the transmission slipped. It is more likely that a gear belt in the transmission failed, than something being wrong with the transfer case module or TCM.