Can anyone tell me if an aod transmission from a 91 5.8 bolt up to a 91 5.0

yes if they r both windsors they will but if the 5.8 is a clevo it will not go without changing the bell housing i think

The Cleveland was only built till 81, so you shouldnt have any problems.

Several minor things to check, shift linkage, tail housing lenghts which there was two differant lenghts, and also the number of teeth on the output shaft which runs the speedo. Other than these minor details it will bolt right in.:)

Good luck:D