V/W JF506E 5spd Transmission
Slipping, shutter or no reverse gear.
We have seen the reverse piston in the transmission crack.
As they appear to be more commonly failing in recent times, there is aftermarket pistons available. Good news is they have been upgraded to last a bit more then the stock type.
Result: Once the updated pistons are installed, you shouldn’t have any relevant complaints.
Note: We have come across other causes as to why reverse gear is failing as well. As the piston is a common cause we have seen solenoids, valve body, wiring harness give a similar complaint. We will need to inspect and diagnose the vehicle on a job by job basis.