I think your problem could be the motor, mine was. On my 2002 4/4, the casing bearing/bush had seized on the gear wheel. Those nice folks at car builder solutions helped me out. Good luck.
https://www.carbuilder.com/products...kit?_pos=26&_sid=8354345d7&_ss=r
Check your sweep angle, look inside motor box.

2002 4/4 Zetec Indigo Blue purchased July 2023 my first Morgan