I noticed a antifreeze drip coming off the bell housing today. Does anyone know what this is? It is a 3.9 rear wheel drive 99.

 

Is that the only place you have noticed the drip coming from? I had a '95 with the 3.9 and I had a drip and it ended up being the by-pass line that is under the mounting bracket for the alternator. You cannot see it unless you remove this bracket.