I have a 97 f150 with a 4.6, long bed standard cap rear wheel drive what year rear could I get that already has disc brakes on it to fit my truck I believe it has 355 gears in it, I currently have rear drum brakes and I can't stand them

 

I believe 99-03 (mid-year 99 or was it 2000?) will have what you want from behind a 4.2 or 4.6-equipped truck.

See here:

https://www.f150forum.com/f6/convert...107868/index2/