Can a transmission flush be bad?
Correspondingly, does flushing a transmission cause problems?
If you do a flush when there is damaged transmission material in the transmission fluid, you could cause a problem in the valve body at the bottom of the transmission. If the valve body gets gunked up with damaged transmission material, you could lose the ability to shift between gears.
One may also ask, why You Should Never flush your transmission fluid? Pressure flushing can cause aging seals to start leaking. When it leaks more than a quart it could burn up the unit. Flushing does not cause the transmission to fail but it may speed up the process because it pushed metal particles back through the system.
Secondly, are transmission flushes worth it?
Under normal driving conditions, a flush is NOT necessary at 46K miles. The shops make money on flushes, that's why they recommend them. Most transmissions are good for 100,000 miles before requiring maintenance. Maintenance is debated between a flush and a fluid drain and fill.
Should I do a transmission flush or change?
Where a transmission fluid change will only replace some of the existing fluid for new, clean fluid, a transmission fluid flush completely removes all old fluid and replaces it with new. Mechanics recommend a complete flush approximately every 60,000 miles.