I work in a transmission parts supply warehouse and have sold literally thousands of the parts AND units in question here. If you want some good straight info, call us Mon-Fri 8:00 to 5:30 MST. Idaho Transmission: 1-800-225-6568. There's lots more to be said than I want to type here, but I'll give you some basics. The early SM465's had 10 spline outputs They didn't go to the 32spl until 1982, the first year for the NP208. The NP203 T-case you have presents the biggest problem. Nothing else will fit in it's place without major modifications, but it can be done. Putting a NP205 in it would be the best, but here's what you have to do: Having a spare truck with all the right stuff is handy. First, you have to have a 205 with the right input in it, 27spl to mate up to your 350. You can change the input gear in one, but not one that was behind a TH400. Having the right t-case, you need the adapter between trans & t-case. Also you will need the sleeve that couples them together, and the complete shifter for the 205. Next, because of length differences you will have to move the crossmember, use different mounts(maybe), and when you're all done with that you will need to lengthen one drive shaft and shorten the other. Hence my comment about having a spare thuck with all that stuff on it. It's possible that you can fix the 203 without much trouble. There were 3 designs of the conversion kits made. The one that Bob has pictured is made by Milemarker, and is a good design. The crappy ones were the ones using a one piece gear instead of the 4 blocks. The most common problem with those kits(and this may be your problem) is that over time the thrust bearing behind the rear yoke would shell itself out and cause too much end play in the shaft. That usually resulted in the shaft moving backward just enough that the sliding collar wouldn't engage all the way and they would pop out of gear. If you take it apart and find everything all right there, then you may have fork problems or something more serious, but it can be checked out fairly easily by taking off the yoke and rear housing. If you're not familiar with this stuff, I wouldn't do it without first looking at some instructions for the conversion kit, though. Call and ask for me & I'll discuss it with you, or any of our salesmen can answer your questions, too. I hope this helps. Jeff B.
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