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It isn't usually necessary to disturb either the speedo drive gear or driven gear when replacing a driveshaft so I am wondering if your car is an exotic or unusual model.
I seem to remember seeing one model where the speedo drive gear was a plastic ring-gear that was very exposed with the driveshaft removed and easily displaced from the side of the final drive differential by the careless refitting of the shaft.
If you remove the driven gear you should be able to see or feel the drive gear and ensure it is in line, still firmly attached and rotates when the road wheel is turned.
If all is ok there then the trouble is with the driven parts whether mechanical or electronic.
I just got one for Christmas too. Had it flying for 10 seconds, and lost control. I have to work on my piloting skills! After that initial crash, I prepared for another take off and realized my lower rotor was not spinning. It turns out that the tiny vertical gear that powers the lower rotor gear fell off its axle. The axle is connected to the sensor that receives the signal from the throttle. Luckily, I found that tiny gear sitting inside the head of my helicopter. After spending 2 hours trying to place it back on the axle, I got it running again. The rotor was spinning again, but it wouldn't take off. I did some troubleshooting, adjusting the trim multiple times. Then the gear fell off again. I found it and noticed that I had damaged the plastic teeth from using my tweezers to reinstall it. You can go to Team-RC.com to buy a complete gear system for $6.95. You won't need to replace all of the gears, just the one that fell off, and it's always a good idea to have spare parts just in case.
my suggestion is that watever spare part u replace, get it replaced by the original manufacturer to avoid future problems. take it to the shop you have bought it from, ask them where u can get one. they may help u better with contacting the manufacturer. i know its time consuming! good luck!!
I had a 1994 Crown Vic and 165000 miles on it and never a problem with speedo. You need to replace the cable and the gear next time. I guess you know to get the correct transmission plastic gear for your size differential.
If the part keeps getting chewed up the drive gear in the trans must be chipped.