Ah, yes! Forgot to mention that the MUDDER I partnered with happened to have that input shaft laying around and threw it into the bargain, along with a bearing retainer! Not sure about all these things yet, i.e. I need to start doing some research. So stoked.
8/80 to 9/85 H41 and 10/82-9/85 H55F were the same. 10/85-? were the same. From what I understand you need to switch input shaft from transmissions in the same year range. Not sure about the B H55F but the F/H H55F has two oil channels on the 1085+. If I'm wrong sure someone will correct me. I do know 10/85 the part numbers changed on input shafts. If the input shaft teeth you get matches the teeth on you H55F you should be good.