A833 inside swap

Map63Vette said
Just out of curiosity, why does the input retainer have to fit perfectly in the bellhousing? The bolts that hold the trans to the bellhousing should locate it pretty accurately as well as the pilot bushing. I'm almost certain mine is no where close to being the same size, the trans is a 73 and the bellhousing I'm fairly sure it an OD aluminum setup. I haven't been running any adapter and so far it doesn't seem to give me any issues.
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The retainer aligns the input shaft of the trans with the center of the crankshaft. If they aren't in very close alignment you'll have difficulty shifting & you'll likely start eating the centers of your clutch discs & the front bearings of your trans, leading to a lot of other nasty stuff that can happen. Just stabbing the input shaft of the trans into the bearing in back of the crankshaft isn't enough.