I just finished a QA42A box and there are 2 bearings and one seal at the end of each shaft. So, If you are going to O/H the box you will need 2 inners, 2 outers and 2 seals.
The inners are open face rollers that should 1st be packed before installation.
I used wheel bearing grease for that as well as in the gear box itself. The seal goes between the inner and outer bearing. The outers are sealed bearings.
I chose to go with parts from IH Case instead of aftermarket stuff which would no doubt be cheaper. Here are some #s for reference. These are for the QA42 but should be the same for others, you will have to do your own research here.
Bearing #475627R91 $26.00 ea 2 req'd
Bearing #475628R91 $23.32 ea 2 req'd
Seal #485306R1 $11.48 2 req'd
Needle bearing for the adjuster bracket #387835R91 $9.35 ea 2 req'd
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