If they mean the speedo gearbox, maybe. I think this works like older cars in which you have a gear on the transmission shaft which drives a gear on the speed sensor, and sometimes the gear on the transmission shaft can break the clip which locates it and it slips out of position. Many transmissions allow removal of back section to gain access to repair this. However, some newer cars have a speed sensor which uses an electromagnet to pick up signal from a internal magnet. Removing the speed sensor from the transmission (easy!) should help determine the cause of your problem.
SOURCE: 04 Maxima abs light and brake light on
The first step in diagnosing this problem is to hook it up to an ABS scan tool and see what trouble codes it has put out.
SOURCE: speedo does not work, replaced the speed sensor
You will have to inspect the speedo cable that goes from the back of the meter through the car's firewall and unto the transmission. There could be a break between the transmission and the firewall or at the back of the dashboard.
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