I got a real seal replacement on my car which is an automatic transmission. After the repair, the engine is slightly more noisy and the noise has a slightly higher pitch.
Is this normal? What could have caused the change?
Note that to do this repair the engine has to be taken off its mounts to drop the transmission out. However, my understanding is that remounting the engine should not make any difference to how the engine runs, even if the remounting is off in some way. Is that not the case?
In other words, could there be some kind of alignment issue? My mechanic said that the engine does not need to be re-aligned in any way.