I use 2 5/8 bolts with the heads cut off and 2 flats ground on the end to help remove if needed for help with alingment of center section to rear. The transmission input shaft and its housing bolts to center housing with or without T/A and the outside of that housing fits in the big hole in transmission to take care of final alingment. The transmission main shaft front roller bearing slides inside transmission input shaft, on reassembly some recommend putting a rubber band around rollers to hold them closer. I usualy remove belt pulley gear box or cover and reach roller bearing and lift front of main shaft to line up because transmission main shaft drops a little without input installed. Most 450 have just the splined coupler for the pto shaft,if so the splines need lined up also when installing center to rear. If it has the seasonal disconnect just set in disconnect position when installing housing. Before removing center housing from transmission take out 9- 5/8 diameter bolts( not head size), one is inside the T shaped cover plate on bottom of center housing. If you don't know how parts are removed from center housing you should get a manual or someones web site that shows how.
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Today's Featured Article - Timing Your Magneto Ignition Tractor - by Chris Pratt. If you have done major engine work or restored your tractor, chances are you removed the magneto and spark plug wires and eventually reached the point where you had to put it all back together and make it run. On our first cosmetic restoration, not having a manual, we carefully marked the wires, taped the magneto in the position it came off, and were careful not to turn the engine over while we had these components off. We thought we could get by with this since the engine ran perfectly and would not need any internal work. After the cleanup and painting was done, we began reassembly and finally came to t
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