Use the search button (click on discussion fourms, halfway down) Then on the right side on the bottom move the query to First generation. There are many guys who have had your problems and multiple ways to fix... . rebuild, NV 4500 from Quad 4x4 etc.
Look at the posts on the first gen side... . there were some discussions not to long ago... . also welcome, sorry about your transmission, but you will find a lot of information and friendly people.
Dave