I believe the transmissions will interchange, but the ratios are different as I recall. Most all the parts outside of the engine, transmission, and ECU, will be identical. Oh, the '87 does not have ABS, whereas the '89 does - so brake rotors and possibly calipers and lines are are different. But you didn't want to swap those anyway. I'd say whether to get it depends on how much storage space you have, how cheap it is, and how much your '87 needs parts.
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