Yep, either use that Th350/NP203 combo, or find you a used married combo of SM465/NP205. They're out there and you'll be way ahead in trying to convert all that mismatch and 2wd stuff. There's also SM465/NP208 aluminum Tcase combos that can be had also. There is both pros and cons to both the NP205 and the NP208. For one, that SM465/NP205 is likely to be a bit pricey. So I'd go with whichever combo I found first and go with it. Either one of those Tcases is better than the NP203 full time option any day of the week IMO.