Manual transmission reverse is blocked

SOURCE: Reverse gear has grinding noise...?

Have them flush the fluid out under warranty and put in new fluid, and have them bleed the clutch lines in case air is getting in there. Audi and VW claim lifetime transmission fluid but it's BS - I've changed relatively low mile fluid from these cars and it was horrendous. It's possible that the fluid itself is causing trouble, but it's more likely that it is a synchro problem. If it was a clutch issue, you should have problems with more than just reverse gear - a clutch simply engages and disengages the engine and transmission, regardless of which gear it is. The problem (if not fixed by fluid) is in the transmission, and being under warranty, don't accept another "suggestion" like they're giving you. Changing your clutch isn't gonna do it.

SOURCE: how to remove transmission , how to replace reverse gear?

Are you sure that it is gone? make sure the all the bushing on the transmission are good it maybe that it is not able to go all the way in gear. If you do need to take it out get a good manual "Bentley" are the best it will show you the inside of the transmission too. Haynes are also good but not for working on the transmission it self

SOURCE: Need confirmation that 5 Speed Transmission out 1993 Mazda Protege SOHC 1.8 liter Will Bolt up to the Same L-4 Block Engine /Mounts in the 1990 Mazda Protege LX 1.8 liter DOHC

try calling a junkyard and see if they will tell you the enterchange ok good luck

SOURCE: 5 speed manual transmission. reverse will not engage

I had the same problem. A spring in the gear change selector had broken making it impossible to get into reverse and very difficult into first to fifth. Simple repair. Might be similar to your problem

SOURCE: Manual transmission jumps out of 5th gear.

97 nissan transmissionno 5th gear. does it have a O.D. electronic switch that con go out