Good morning all,
First you will forgive my English, I am writing from France.
Happy owners of an xfr for three years she has the annoying tendency to make me all the known problems on this model. I have all repaired little by little, but I don't know what to do.
Six months ago I replaced flector and box support, after that nothing to say. Recently I have had large vibrations which have appeared in the engine ranges from 1500 to 2200 rpm. The vibration came from the rear center of the car. I therefore naturally said to overcome the transmission ... I therefore changed the remedy (not in difficulty). The vibrations have decreased but are still present ... I do not know what to do ... If someone has an idea I take.

 

Not sure what a flector is?
But suspect engine mounts, transmission mounts and drive shaft Guibo. This is the rubber disc on the drive shaft.
The drive shaft center mount bearing is a possibility too.
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Yes I know what a flector and a bearing I changed all that myself. The flector is 6 months and the bearing 2 days. But vibration still present. Vibrations appeared 2 weeks ago ...
By cons after dismantling the rear half shaft to replace the bearing, I noticed that the attached CV had hard points. Could the vibrations be due to this?

 

What I meant was I don't know what you changed because I don't know what a flector is?

When you removed the CV joints did you note the position of the attaching nuts and bolts?
They are colored differently and MUST be put exactly back as they were for balance.
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We misunderstood each other.
The flector is the same as a Guibo.
The vibrations were there before I dismantle the shaft, I took care to note the axis of the shaft by disconnecting it and the position of the CV joint attached on the differential.
By cons the attached CV joint had hard points in rotation, so I tell myself that the problem may be from there?

 

As clubairth suggested, you may want to check your transmission mount. I had vibrations at the same rpm range as you on my XJ, they went away when I changed the transmission mount. If that is bad you’ll probably want to change your engine mounts too.