krebs,
I just finished last wknd taking out my th350 and 1st my np203 t-case. If yours is set up anything like my set. You almost have to. T-case bolts to adapter, adapter bolts to the tranny. Adapter is mounted to the crossmember support. Anyways now is a good time to check the seals on the t-case and replace if needed and check the shift linkage as well. Only advise I can give is if you do take out the t-case and crossmember, under no circumstances should you allow the tranny to support itself from the bell housing only. Always keep a jack underneath supporting the tranny. Might have someone help you with t-case. Did mine by myself not to smart. Chest was little bruised up for next two days. Tranny jack a plus(really makes it easy) or you can take off the top round disc on your reg jack and bolt a 2x6 x 18in long and balance the tranny on it . Just take it slow. anyways good luck
Peace
James