A833 Rebuild help needed.

So long story short, I have gone through the rebuild process and am to the point of reinstalling the main shaft/tailshaft assembly. When inserting main shaft, I can get the gap between tailshaft and main case to about 1/8 to 3/16 by hand. At that point, input and/or output shafts can be turned by hand. As soon as I start to tighten the bolts connecting tailshaft housing, everything locks up and won’t turn. I’ve inserted driveshaft and tried to turn with that with no luck. I have repeated this process several times with the same results. Here’s a few pictures to review and see if I’ve made an assembly mistake.

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