Are there any hang-ups in switching trannys between 88 sub 4x and 91 1500 4x pickup. I know both are 700-r4s but the tcases are different. I'm not planning on switching tcases just have a good tranny in the sub and got the pickup for free. i have the know how and ability to do the swap i was just wondering if anyone knew before i dig into it and find out the hard way.