oil leaking throu trans tunnel ?

[dalfy1505]

i was towing a 72 jimmy on a trailer with my 73 that has a 350 th350 np203
and on one hil it downshifted to first and started smoking i manualy shifted to second n all seemed well but my foot slide kinda funny on the floor n i noticed i had something coming through the side of my trans tunnel seems to be oil not trans fluid i just have no clue were it could have came from or how it could come throu the trans tunnel got underneath theres no linrs or anything near there