If it's like the earlier D-series trans, the ISB is something of a weak point. It dies if you chronically run without enough transmission oil--say, if you don't remember that the level will be wrong if you put the front of the car up on stands when checking/refilling the transmission oil... (Don't ask how I know that.)
Removing the ISB either requires a slide-hammer, a bearing puller, or some improvisation and some luck. I believe the input shaft seal has to be replaced to get the ISB out.
-soD
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