I have a 1996 Ford taurus 3.0 does a AXOD trans

NO you will have to have the correct trans

Ask a trans repair shop,but I doubt it

The best you could hope for, would be to change the
trans wire harness.

I doubt the PCM will even work with the other trans

Should have rebuilt your AXOD

The trans filter has nothing to do with shifting,
you surely are knowlegeable enough to know that

If you were out of money, you would be riding a bicycle
& eating at a soup kitchen

Take it to a trans repair shop

About every 30,000 miles. (I changed mine at 60K and 100K)
This will show the maintenance schedule.
https://www.driverside.com/service-schedule/complete/ford-taurus-2003-3826-8727-23113

my overdrive isnt working when it worked in the car it came out of

Absolutely not
Rebuild your AXOD

Never install a used unit. Someone elses worn out piece.
If you changed your fluid every couple years, you wouldn't have this problem.

The best way is to use the vehicle VIN number, here is a link to a Ford Vin Number Look-up site, that will tell you the transmission code and the type of transmission you have:
https://www.fleet.ford.com/maintenance/vin_tools/default.asp

O.k. I don't know what a changeover transmission is. Are you talking about a remanufactured transmission? The transmission in a 1996 Taurus would be a AXOD-E or a AX4N. Not sure about the price. I would guess about 1600-1800 dollars.

I dont think that will work ....1988 was aod and aode trans

The AXOD-E was renamed AX4S in 1993. In addition to the name change, improvements in the lubrication of the gearset and capacity upgrades were made. A centrifugal piston assembly was implemented in the intermediate clutch position to improve 1st-2nd and 2nd-1st shift quality and an increase in the clutch's durability was made on some models. High energy friction materials were also introduced. A new twin piston torque converter clutch (TCC) was introduced with the AX4S and the AX4N on some models. The transaxle pan on this model will sometimes read "AXOD Metric" since it's based on the AXOD transaxle. The data plate code for this transmission is "L."
Applications:

• 1993–1994 Lincoln Continental
• 1993–2003 Ford Taurus
• 1993–2003 Mercury Sable
• 1995–2000 Ford Windstar

The Ford AX4S automatic transmission is a four-speed electronic overdrive transmission used in 1995 to 2000 Ford Windstar minivan. The transmission is also used in 1991 to 2003 Ford Taurus and Mercury Sable, and 1993 to 1995 Ford Taurus SHO models. The AX4S is a second-generation version of the AXOD and AXOD-E transmissions used in 1986 to 1991 Ford Taurus.

which transmission do you have what year is it...axod ax4n it is stamped on the end of the trans behind driver side wheel