here are three main scenarios that will dictate why you might consider replacing a stock split case transmission. Case No. 1: Say you are doubling, tripling, or adding even more horsepower to your pre-1961 Beetle; then converting the stock split case transmission to the much stronger tunnel case gearbox is a must. Case No. 2: If you are driving an original/ vintage VW but run a period-correct, souped-up 25/36hp like Okrasa engine (or Judson, even Porsche 356), the stock first non-synchromesh transmission will soon show some weaknesses due to the increase in horsepower. Case No. 3: You are driving a stock 1960 or earlier Beetle with a stock gearbox and you
