Q: Will a 2003 mustang 3.8 automatic transmission go in my 2000 mustang 3.8? Is anything different between the 2?

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Ok so i bought this my 2000 mustang 3.8 automatic about 3 weeks ago off craigslist. Drove it home and never checked reverse till next day and realized it has no reverse. I have been looking at buying a transmission and came across a 2003 mustang 3.8 automatic for good price with 90 day warranty. I don't have the money to pay to rebuild it, thought about rebuilding myself and tallked myself out of it. So i guess my question is can i replace my 2000 with a 2003 and if not , why? I have Googled it and get mixed answers. Some say 99-04 will interchange, some say only 99-00. I'm going crazy here don't know which is which.

My car has 200000 miles.
My car has an automatic transmission.

Both years use the 4R70W transmission, but the OEM part numbers are different. I checked some aftermarket suppliers and those part numbers are different also. So, the answer to your question appears to be no, the two are not interchangeable.

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