2 doors stopped production in 1983 , so any mechanical differences relate to age rather than 2-4 doors. The 84 four door was about identical to the 2 door .
The next big change was injection in 87?, and the newer interior in 85?, and the ZF 4 speed auto in 87.
The biggest changes were in 89 when the 3.9 came with much better injection and a sronger ZF auto.
I and many others think that the 89 3.9 up to say 91 or 92 are the best keepers as they have good wiring, and do not have expensive to fix stuff like ABS and air suspension. I have a 92 after an 81 2door and 77 2 door and there is no comparison for comfort and quietness.
2 door seatbelts and seats , and the 4door up to the new interior can put people off as the seatbelts are attached to the seats and can be uncomfortable to many.
Regards Philip A


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