An 84 would have had a manual box from the factory so it’s already been changed which means it could have an LT230 or a Borg Warner TC. Either of which would fit behind the 5 speed. If it is a Borg Warner unit then make sure the viscous coupling is ok before using it.
Can’t remember exactly when they went to the LT77 5 speed and LT230 from the 4 speed LT95 with integrated TC but think an 84 4 door would have had an LT77 5 speed and LT230TC from the factory. Given that the LT77 boxes weren’t the strongest suggests a PO has fitted the auto after it died (like I did to my 86 when this happened).
If they did what I did, then the original LT230 was fitted behind the auto and struck back in which is a fairly straightforward job.
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