If your KM145 is dying it is not too big of a deal to swap it out or have it rebuilt. They are a pretty reliable transmission and they can be made even more reliable by adding a Tuff Pan. From my experience most premature failures are maintenance related. The whole swap can be done in just a few hours. I think my last tranny rebuild cost about $500 to have a shop go through it. They had to replace the fork and few other parts. It should be good for another 300K miles.

Spence
1985 Mitsubishi PU 2.3 Turbo Diesel, 13" lift, Watercooled turbo, 4D56 Head, Atlas II,Fox Coilovers, Elockers,

1983 Mitsubishi PU 2.5 Turbo Diesel 4x4, fully restored

2003 G500, sliders, beadlocks, roofrack, ladder etc.