Are you familiar with the input shaft circlip issue on the Citroen transmissions? If not, I highly recommend looking into it. What can happen is that the circlip used to hold the input shaft in place is inadequate, and it can wear out, which causes the shaft to lunch on the crank shaft.
Mine came loose, but I got lucky, and it "only" cost a few grand to repair, as opposed to a lot of grand if the crank had gotten messed up.
Not trying to panic you or anything, just letting you know there is an important matter with the G-car transmissions to look into.
If your year of Esprit is affected by the issue, I would suggest pulling the transmission and replacing the circlip. A replacement circlip is quite cheap; but the labor is somewhat involved.
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