It's a 1985 based on the decals.
1984 decals included the model number on the downtube.
1985 decals only had the name TREK with the shadow font (not
sure of name) and the model number on the chainstay protector.
1986 the model changed to the Elance 400D and Elance 400T
1984 decal:
1985 decal:
images courtesy VintageTrek.
Marty
Marty