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B10 driveshaft alignment

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Does anyone know how critical the driveshaft alignment is on these tractors? I'm re-assembling mine, and notice that there is a very small amount of play in the mounting holes for the engine , allowing it to be slightly shifted one way or the other. I want the drive shaft to run true , but I don't think I need to get the dial indicator out and shim everything up either. I can't find anything about this in the manuals. Do i need to worry about it? Thanks Dave

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I like to get shaft on and tight, then bar the engine a few times to make sure discs don't flex much and square up to BGB the best I can before tightening engine down. The discs were meant to give a little. If it were real critical the repair manual would call it out.

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