95% chance it is the "conductor plate" in the transmission.
On a DIY scale of 1 - 10 :
With a lift : 4
Without a lift : 7
Did I say it's messy ?

( $115 on Amazon - https://www.amazon.com/MNJWS-Transmi...ctor+plate+kit )
and you will need about 5 liters of approved transmission fluid for the 722.6 transmission.