[cadillac_al]

FWIW my Dad bought a brand new 85 C10 with 305/700r4 and it never shifted right from day 1. WOT would totally confuse it. The dealer couldn't figure it out or fix it. I pretty much avoided those trannys since then and lived without OD all my life. I now have a Jeep WJ that works fine in normal driving but WOT totally confuses the trans. I don't fully understand automatic transmissions either. I hope somebody can point the OP in the right direction.

This may be one trans that does benefit greatly from a shift kit.