If you search you will find an adapter but you will be wasting your money. A stock Ranger trans isn't going to hold the torque of a V8. An F-150 trans will be the easiest swap. You can choose from the 4 speed t18/19 or the NP435. The 5 speeds will be the M5OD-R2 or the ZF. I can assume acidh3r3t1c has the M5, otherwise he would have mentioned the massive hole he had to cut to fit a ZF. The large BW t-cases don't fit well into a Ranger. The NP205 or the NP 208 are much better fits. You will need new driveshafts. You don't "need" new axles but with the extra torque and if you add bigger tires it would be a suggestion. The 8.8 rear axle from a Ranger would be a direct swap, but little bit stronger 31 spline Explorer 8.8 will need the mounts relocated. For the front the easiest is to replace the Dana 28 with a Ranger Dana 35. Do the front before you make driveshafts, with a Dana 35 the shaft will have to be about an inch shorter compaired to a D28. Other than that it is bolt in.
Matt