You can always spend more money on a car but you don't have to. You can use a junkyard transmission from a diesel car because the gearing is closer to right or you can use an Xtrac transmission and get perfect gear ratios. Both are legal in G2 and neither are legal in production.
And yes, Lurch's car is extraordinary. But then he is a good driver and can make use of it. It is not expected that a novice driver will be able to do so.