Below is an image of the transmission which shows item # 16 which could be causing you the issue that you have. It is on the online store HERE . Also it could be item # 15 which is also on the online store HERE . Note that you will not know till you pull down the gearbox as to which is worn.
Regards,
Bruce
Please do not PM me asking for support. Post on the forums as it helps all members not just the individual.