Should I get a new tranny or rebuild?

Hello all, new to the board. I need some help on deciding whether I should rebuild or buy a tranny. I have an 01 must. GT with an auto tranny. The tranny leaks like crazy and the tranny slips. The car has 125,000 miles. I am the og. owner. I do not know of a good repair shop. SHould I go online and buy a new tranny and have ford put it in, or go to the dealership and have them rebuild the tranny. I am a student so money is tight. What do you recommend. THanks. :nice:
 
You can rebuild your 4r70w and make it stronger internally than before and it'll be cheaper than buying an entire new one.

I went with a rebuild (upgraded clutches and such) and its been working great ever since :nice: