Yep! Been there and dealt with that. I hit it with pb blaster periodically for months. One day I just grab it and it came off.After removing the 2 socket head bolts from the helmet retainer use two 1/4” X20 bolts to pull the retainer out of the top of the gearbox.
As SD just said you will be will be referring to the drive’s parentage. Especially if the spline shaft is rusted to the female side of the input and will not separate.
Here's a tip I learned. The bolts that hold the shift linkage cover on are the right size to pull the retainer.After removing the 2 socket head bolts from the helmet retainer use two 1/4” X20 bolts to pull the retainer out of the top of the gearbox.
As SD just said you will be will be referring to the drive’s parentage. Especially if the spline shaft is rusted to the female side of the input and will not separate.