I have a 2000 Chevy Impala i recently had my transmission fuel and filter changed and transmission fix-it added, now my car goes out of gear when i driving on the main roads or come to a complete stop i have to turn my car off for a few minutes then restart and it continues this cycle every 10 minutes, however when I‘m driving on the highway it does not shift out of gear. Now I‘m told I need to replace my sensors and or torque converter or catalytic converter which could fix the problem just wanted to know if this was true or did I need to replace my transmission?
First; transmissions have fluid filter they don't use fuel. when the person put transmission fix-it is this an additive that is one of those miracle in a can things ? Because they simply don't work. Most times they are used; they are used improperly and cause more damage than good. People think that it's a cheap fix rather than rebuilding the transmission but, it's not very often that they do what people think they are supposed to do. And they have to get a rebuilt transmission anyway. The catalytic converter is on the exhaust system not the transmission, replacing it wouldn't effect the trans. at all. Since they didn't say which sensors to replace, disregard that diagnosis. If you replace the torque converter it MAY solve your problem but it will cost about as much as a rebuild. I'm not a transmission EXPERT but I would take the car into a good, reliable transmission shop. Instead of some fly-by-night place to get an expert opinion, since you got ripped-off this time around. Don't be too surprised if you have to replace the transmission with a rebuild.
you may have a worn wiper linkage. try bending the skipping arm away from the windscreen.
I'd start out with making sure that your transmission linkages are position in the right spot. It almost sounds like when you put the gear selector into drive that down at the transmission its not quite in drive at that end. Not sure why it would suddenly now pop out of gear now perhaps it was hit or something when it was brought in for service.
They need to be replaced, at least this is what I have usually found. Don't know what the exact cause is, other than old ones being worn.