I have a 1998 c1500 with 4.3L V6. Reverse and OD are gone. I have done some research and seems like rebuild is going to be the best option for me. I don't know where to find a rebuild kit that has everything that I will need. Also someone mentioned "partial rebuild" which I really don't know what they mean by "partial"- I feel like if it needs to be rebuilt then it should all be done at same time. Any advice/recs appreciated.

 

The best DIY info I have found.https://transmissionbench.com/4L60Evideos.html