np440 my6 parts ID help

[69chevej]

I'm rebuilding a np440 for a 67 cst and need a little help with a part Id. My kit can with what looks like a trust washer, its in the lower left corner of the picture. My trans doesn't have one and the parts diagrams really dont show it, any help thanks

[geezer#99]

If no one here chimes in maybe contact these guys.
https://www.passonperformance.com/

[69chevej]

thanks