any lift on the b2? 345 gears i assume not. explorer axles can be a bit too wide for stock b2...but a worthy upgrade.
355 rear end from a ranger....though that ratio in a older narrow 7.5 is hard or likely impossible to find..
the explorer is quite a bit wider then the rangers. but real common in 355.
the perch spacing and differential offset is a bit different(slight)with the rangers but i interchange them with no worries. sometimes some shims ect... depends on what style rear driveshaft you have. a b2 axle in a later ext cab will have rub on the stock gas tank skid in certain situations from the drive shaft...nothing a sawzall trim cant fix....
i ran into an explorer...92 with 410 gears when i went and picked up an axle for my sisters f-150....it was shitty drums but i looked at it anyway...4l10 on the tag......and the front was mostly unmolested...so a d35/8.8 410 matched set for 175 bux was looking good...but after i looked at it i realized it was a smoothie hybrid d35. i did not realize explorers could have a hybrid axle. according to t.a.s. that vehicle was bone stock as it was a family members.. i popped the auto hub and rotor off and spindle...and it was indeed 23 splines on the inside.. should have bought it anyway. not worth the time for the rotten beams though. i had to get the axle in my sisters truck swapped and get back to work before they knew i was gone