Driveshaft won't fit

Is your car folding up in the middle? lol.

mshred said

And now things are getting worse- now, no matter what gear I put the trans into, I can not sping the output shaft at all, either direction...

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Yeah that speaks to the forward clutch possibly being bound up; easy mistake to make but should have been caught when checking the Endplays, after the front was installed.
But what do I know, I'm just a lawnmower mechanic.