Thanks for letting me join ... I'm looking for my first Wrangler, we have had several Grand's with 4.0 .... I have found a clean TJ but it has the 2.5 with auto trans ... keep in mind that I'm 72 years old and don't need a hot rod .. but .. we do ride some trails with steep hill's .... is the trans and transfer interchangeable with anything else ... I would prefer the old tried and true 4.0 .... Thanks ... your wisdom is much appreciated .... How bout going 06-17 TJ ... what to look for?