If anyone is still interested in a game similar to GHG I found this online the other day and had to laugh and see if this forum was still going:
Car Mechanic Simulator 2014
It is basically a new version of GHG, but much more modern and looks like it has some driving in it as well. and it is only a few dollars._________________
I've seen that one on Steam. Have thought of buying it a few times, but I have way too many other games to play that I doubt I'd ever get around to it.
Also note there is a newer version as well:
This game really is what most of us dreamed GHG could be back in the day. I am just glad to see someone realized there are people who like working on virtual cars (and real ones too...)_________________