Whilst off road I needed to reverse up a steep incline. A loud bang and no reverse or 1st gear at all. 2nd, 3rd and 4th will engage but when you increase revs the gearboxes makes awful metallic major problem noises. Gearbox and clutch professionally rebuilt one year ago. Is it cheaper to buy recon gearbox or to repair and rebuild. Have a Fairey o/d and was in 4x 2 at time of breakage. Has anyone got any suggestions?