[dentist90]

I originally posted this elsewhere, but your problem sounds like mine:
I have had problem with 5-4 downshift with my 915. There is a reverse lockout cam on shifter housing for 5th gear. When the shift lever is placed in 5th the cam is designed to prevent accidentally pulling the shifter back into R. I have had terrible problems with crunching Reverse while trying to downshift 5-4. It is NOT a good sound. I could barely pull the shifter out of 5th before grinding. I did the most logical thing and repositioned shift rod coupler so that I have to pull shifter farther back (ie toward console) to engage R. This has certainly helped, although 2nd gear is quite close to my thigh. PROBLEM: now the R lockout cam not working! When shifting into 5 the shift lever doesn't go far enough forward to allow cam to click in behind it, thus I can pull the shifter from 5 directly into R (only tried it when stopped!). Should't be able to do this! Admittedly I can now downshift from 5-4 without nicking R if I am focused on it. Still jam reverse once in awhile if I have to downshift quickly, as when an oncoming pickup pulled out to pass someone about 500ft ahead of me (had about 2 secs to get out of the way!)
1st thru 4th are great, into 5th is good too (lots of spring pressure. 5th to 4th still makes me cringe every time. Anyone else have issue with nicking R coming out of 5th?
Porsche factory short shift just installed (replaced older, worn factory ss kit). New cup bushing, rod bushing and shift coupler last year. Shifts firmly, no slop... just too easy to remove synchro teeth on reverse.
I have tried adjusting coupling every which way. I wonder if the 5-R shift fork inside the tranny may not be positioned properly?