1977 450SL (60,298) Miles *Is it worth it?

Hello Gentlemen, or if your only 40 and people call you sir and you hate it, "Whats up Guys".

I have a chance to buy a 77 450sl with 60,000 miles for $2500.00 Looks and runs great, except that it wont reverse.So right now it looks like I may need to FRED FLINSTONE it to get out of the drive way. My question is, do any of you think that with only 60,000 miles it is premature for it to need a rebuild? I read somewhere that there is some type of "adjustments" that can resolve the problems. Below is a link

http://www.mercedesdismantlers.com/722.118_transmission_adjustments#722.118%20Transmission%20Adjustments

I would appeciate any of your guys input.