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Yeah the T-18 would be better for highway, then again with 44's on there I doubt it will see much highway. As far as I know the t-case should bolt up to it. So I didn't see anything mentioning what case it was so if it is the NP-203 or NP-205 they will match to a t-18. These are also the 2 people use most for the c-6 auto trans. There should be a tag like this:
Mine is the 203 model, not the favorite of some but it is what it is.