525- 84-86 manual cars (except GLHS, and l-body charger in 87)
520- TI and all manual N/A cars 87-89
555- All TII cars 87-89 (Caravan Manual is exception, very rare)
523- All N/A 4 cylinder 90-95? (was told some turbo cars)
568- Small Spline 90 only (TIV VNT daytona and TI manual cars)
568- Large Spline 91-93 TIII, TI turbo manual cars
Axle size interchange (not bodies)
520-555-568-523- All said transmissions use same size output shaft (If I remember correctly)
Shifters (not body styles, again)
525 - Only trans compatible
520-555- Reverse compatibility, can be substituted for hardware from one trans to the next
568-523- Same as above, cables and shifters are mechanically the same.
Note- Some neon shifters I am told work for the 523-568 transmissions
543- Manual transmission for all 3.0 6g72 Vehicles. Shifter same as the 523-568 cars.