The 73 cj5 would have came with the t14 or t15 transmission stock. The t176 will not bolt to the dana 20 tcase without an adapter. with out adapters or transmission mods, I believe your only choices are t14, t15, t150, or t18 if you can find one out of a cj. Do you know what tcase you do have, the spicer 18 or dana 20? I think the switch was in 71 or 72?