The bell housings did not change.
I have a 83 car (came with mechanical linkage); I got sick of that and swapped in a whole hydraulic system from out of a 84 car I think it was, back in about 86 or so, left the 83 transmission in it at the time; went through I don't know how many T-5s of all sorts of years as I tore them up; the last one I put in before I got sick of T-5s, I swapped in a 91 or 92 T-5 in about 96; they all fit and worked fine. Until of course I swapped all that out for a T-56.
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Numquam ponenda est pluralitas sine necessitate.
— William of Ockham, from Quaestiones et decisiones in quattuor libros Sententiarum Petri Lombardi
Roughly paraphrased into modern English, and applied to figuring out what's wrong with your car:
The simplest explanation that fits all the facts is probably the right one. | 
