The car has a 3 speed on the column and I was wondering if anyone knew what tranny I have?

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72 Swinger Special Originally a 3 speed 198/6 car now has a 225 with the 3 speed

72 B200 Shorty Van 225 /6

4 other Fullsize Mopars from 65-73

Is it a manual column shift with a clutch? If so, the trans is most likely a A-903 or a A-745, non-syncrow 1st 3-speed.

If it is a column shift automatic, 99% of the time, it will be a A-904
DD

Its a column shifted Manual Transmission(With a clutch). How can I tell the difference between an A-903 and an A-745?

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72 Swinger Special Originally a 3 speed 198/6 car now has a 225 with the 3 speed

72 B200 Shorty Van 225 /6

4 other Fullsize Mopars from 65-73

The 903 has a flat cover on the top, the 745 has a small upward "bump" in the front of the cover.
To be honest, both these gearboxes are weak and have a non-syncronized first gear. Combine that with the "long and sloppy" column shifter and these can be a "chore" to drive.
A great improvement would be to swap to an 833 4-speed or retrofit a newer 5-speed into the vehicle.
DD

I originally bought a swap meet shifter to convert my 903 to the floor.

There is NO mounting points on that tranny to do that!!

If I can ever get back to work the 833OD hanging in there will be nice to drive.

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'72 Duster 198 stock cam, 3:23's

93 D350 Cummins THD Maxfuel 35mpg parts to hit 400hp+ Suncoast Cat2 A518, converter DDP Stage III injectors 62/64 HX35, 3 piece manifold, 4" Diamond Eye, Gear Venders OD. Stage I street/tow PDD head on order.