Chevy 3 or 4 speed aluminum manual bell housing for small or big block motors using a Muncie Saginaw or BW T-10 transmission with the 4 5/8" input retainer - part number 3858403. Fits 153 tooth flywheel with a 10.5" clutch. Bell has been cleaned up as shown. No cracks, breaks or repairs and all the threads look good; two of the trans mounting holes have an area that a small part of a thread is missing due to a minor casting flaw.