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i have a 2005 monte carlo 3.4 v6 auto with overdrive. i recently replaced the whole cluster because the tach and speedometer was reading crazy.i bought one at a salvage yard installed it and have had no problems for several months.now unfortunatly i am ee=xperiencing the speedometer dropping speed all of a sudden and then it will go to zero and not change at all.the only thing i can think of is the fact that i installed a set of 18 inch wheels and the same day my speedometer started the crazy stuff.so if you have the wrong size tires or wheels i assume that this is the problem.the computer is reading something wrong and the speedometer is responding to this.i hope i have helped you.
Probably not a fluid issue. If the fluid is close to right, a little more or less won't matter. Is the speedometer working? If the speedo quits its because the trans output speed sensor has failed. This will cause the trans to lock into limp home mode. I've had good luck in these cases by buying the sensor (about $25) and put it in to see if it fixes the problem. $25 is a cheap experiment. The output speed sensor is very near the passenger side CV joint. Btw the trans and the firewall. Hard to reach. Easy to change. If the speedo is working the problem isn't the output sensor. Maybe the input speed sensor.
I have a chevy cav 03 and my problem is just in the gas guage and temp guage now i cant seem to figure out how to fix it but for a quick fix i have jut been pulling out the instrument panel fuse and putting it back in it seems to fix t