The Ranger has used a Dana 35 center section with the IFS since 1998 (it was a reverse rotation Dana 35 unit with the TTB before that.) The Explorer since 1995, the Aerostar since the late 1980's.
IIRC, there is a Torsen gear-drive limited slip available for the Dana 35. I'm pretty sure a TruTrac is available also. You can't go wrong with either of these (depending on your application/needs, of course.)
The Ranger has used a Dana 35 center section with the IFS since 1998 (it was a reverse rotation Dana 35 unit with the TTB before that.) The Explorer since 1995, the Aerostar since the late 1980's.
IIRC, there is a Torsen gear-drive limited slip available for the Dana 35. I'm pretty sure a TruTrac is available also. You can't go wrong with either of these (depending on your application/needs, of course.)