My friend is going to convert his 1971 VW from auto to manual. We wanted to know the gear ratio difference between the standard 4spd vw trans and the "Highway master" VW trans, which is geared for cruising on the highway. Whats the regular top speed of the 4spd trans vs the highway master. By top speed, i mean when the car redlines. With the auto his car topped out about 75mph before it redlined. Also, what are all the parts he needs to convert from auto to manual in this car? (1971 Squareback).