One came w/ 22re, other 3vze.
Otehr than the bellhousing, are there major differences? If needed... would a complete A340H be a drop-in replacement for the A340F if you also changed T-cases with it?
'89 FSM says nothing about different gear ratios etc.

With 200+ Billion electrical parts, the world most complicated machine is inside your own skull.

Question Reality.
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'89 Rnr DLX "SR4.5", 32s w/ 5.29 locked f/r blah blah