I am seeking informed opinions on a transmission problem that occurs on W 140 body mercedes. The car in question is a 1992 500 SEL with about 130K on it. When you put this car in reverse it will only roll about 3 or 4 inches and then the drivetrain locks-up. This problem began at once and has never gone away. I'm assuming a broken servo or one-way clutch has failed but would like other opinions. I saw the same failure on a similar 140 a couple of years ago but the owner took it to the local dealer who simply replaced the trans., so I never found out what went away. Your help is appreciated as always.
Thanks to all