I am in the process of rebuilding a 4r100 for my truck. I have rebuilt ZF5's and ZF6's but never an auto so I found a series of videos to follow step by step for the tear down and assembly. Everything checked out with my components until the video got to the direct drive assembly. The trans in the video has a 4 tab thrust washer against the drive assembly with cut outs to locate the washer. My trans does not have this washer or even cutouts to place a washer. The reference transmission is a gas 2wd and mine is a diesel 4wd, but don't know if the washer is different on them. Here is a picture of the reference and mine so you can see the difference. If anyone is experienced with the 4r100's I'd greatly appreciate the help!

4 tab thrust washer

No thrust washer at all