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4R70W what's the difference between a basic-4 and a basic 1A. Also G4 to a G28.? Also tell house # 44 to a 36. Can I do a simple swap on these two ? 97 XR7
 

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1997 Thunderbird 4.6, 1998 Mark VIII LSC
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You're better off referencing the actual Ford part number on the tag on the right side of the case, not the casting numbers on the case.

The important things beyond whether the bell housing physically bolts to your block are whether it's a car or truck transmission (valve body differences), model year (electronics interchangeability and knowing if the internals/valve body need special attention) and tail shaft length/speed sensor style (long/short tail shaft and speed sensor style).

"Simple swap" can be done but it depends on the donor vehicle. The MN12/FN10 output shaft has 7 teeth and all other cars (of similar year) have 8 so you will need to address the speedometer gear or swap the output shafts. Too new and you would need to swap the output shaft and tailshaft entirely as they use a different type of sensor entirely. You should swap in your TCC solenoid and MLPS if it's not from the same car/year. Newer models have a different electrical pinout and will require adjusting the vehicle harness to work properly.
 
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