Why does my 82 porsche not go into reverse?

I have an 1982 porsche 928, it is an automatic, it has plenty of trans fluid. It has NO problems driving down the road, and I drive it on a daily basis, all drive gears work properly. But when you select Reverse, it does nothing, it doesnt sound like it is engaging at all and only revs the engine if you try to backup. Any ideas?|||Your problem is probably a broken reverse band other possibilitys are the reverse servo seals are blown and the least likley is that the reverse clutch pack is burnt up but you would more than likely have lost another gear with it if it were the clutch. The problem is that these are all teardown procedures except the servo it can be done in vehicle.|||Take it to a certified mechanic and have him check the linkage.|||You are needing the transmission to be fixed, youve essentially "lost the gear" it will not work until you have it repaired. I had it happen in a 68 mustang and it was quite expensive, probably much more so for a porsche|||Take it to a transmission shop and have it checked. Trust me if you keep driving it too long the way it is now it could get a hell of alot worse in the long run causing more internal parts in the tranny to shell out. Which in turn will cost you more money. An believe me when I say porsche transmissions aren't cheap to fix.|||Junk that piece of garbage and buy a new one!! :-)|||It could be a few different things. One could be the clutch is worn severely or you clutch master cylinder may be defective. If you system is hydraulic. Or it could be as easy as your transmission fluid being low or needs to be changed. But your best advise would be to take it to a local transmission shop.