As some of you may know i recently have changed my gearbox because it failed. After installing the new gearbox I deliberately didn't install the rear drive shaft(front TC to back differential). I have covered the TC shaft attachment so It does not leak TC oil. I did this because i wanted a new exhaust setup so ill install the drive shaft when the new exhaust has been fabricated.


What I have noticed in the 3 days of driving since then

1) Better Mileage ( About 1.5-2 KM / L)
2) The speedo & and engine rpm rush a bit when accelerating hard
3) I feel that the acceleration after (40 KPH) is better

Can I harm the car if continue running the car in this setup. Want to do this because of better mileage and a few less parts to worry about (drive shaft, rear axles,rear diff, CVs).

what could go wrong if do the opposite and disable the front 2 wheels instead of the rears