A904 Hard 1-2 Shift and Reverse

69 Barracuda vert said

So, at the yoke of the transmission and the input shaft of the Ujoint (the small diameter) is about an 1/8"

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If I'm reading this correctly you are saying with trans in neutral, the drive shaft will rotate about 1/8 of an inch.

Mine will rotate about 1/2"

I don't think it's a worn diff!