about 1400$ in parts plus labour of taking the box out and rebuilding it.
replacing:
input shaft, 2nd synchro ring, 3rd synchro ring, 4th synchro ring, 1st/2nd selector sleeve, 3rd, 4th selector sleeve, 3rd/4th selector hub,
Energiser springs & pads for 1st/2nd/3rd/4th