I am not aware of any difference in the early 4x4 TH 350 transmissions. We have (6) 70-72 4x4's and two extra trannys for 4x4's and they all take the same cover as the 2 WD with the 168 tooth flywheel/flexplate.
I would suggest looking at what you have.
I have a good plastic one if you want it, (fits all of our 4x4's). $6 to your door.
Jim
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