Manual transmission stupid mistake
 

Hello guys,
I'm new to the forum :)
Recently I made a stupid mistake when shifting gears and I'm a little worried about the health of my gearbox (manual).


I will expose what happened:

I went out of the garage moving backward (my garage has a sloping back) in neutral. Then I shifted to R while car moving slowly backward. Simply I just pressed the clutch then the car goes back on the slope and then turned to the R. Then my hand felt a strange “vibration” or "grinding" in the shifter (probably coming from the gears). I didn't heard any grinding noise, only felt some grinding in the shifter.
I've know that the shifting into reverse gear while moving forward is absolutely wrong. In this situation the car just moved slowly backward.
Currently, the transmission operates normally. After this "incident" there was no indication of any malfunction in the transaxle.

However, is there any option to broke something in the transmission or grind a some gear in the gearbox? Do I have a concern about my car's transmission?

The car is Mazda 3 2004 1.6i (manual transmission).

Unless you're doing this every time you back the car up then I doubt you caused any real damage to the transmission. Just, as you said, don't shift into reverse while still moving.

You're all good man. At such a slow speed, I highly doubt that you did any lasting damage just rolling into reverse. Old gearboxes were just crashboxes without any synchronizers or anything, and they could last for quite a while

Well the reverse gear doesn't have syncros......