'39 top loader trans question

Just completely diassembled my transmission, replaced some gears, bearings, and seals. It had the old style synchro, so I bought a unit online, for that year. (It was being converted from an earlier style) All the gears work fine when shifted, engagement good. But when I move it to neutral, the synchro stays somehow engaged, locks up. Any ideas?

 

Pm Fortyfordguy he knows them inside and out by heart i think. He built a few for me.

 

Better yet, buy his book!

http://www.vanpeltsales.com/FH_web/flathead_trans-book.htm

 

Thank you, I'll follow up on it.

 

Thrust washers to tight, bad new parts in second - high slider. Try more lube in assembly in synchro area.