Manual Transmission Sound

yeah, after my taco was put back together and i went in for inspection at local yota dealer for the excessive drop in MPG after all the new stuff they noted oil weep between the transmission and transfer case mating area. i dont know what the hell is going on in there when reassembled transfer oil level was fine when i checked but the transmission was a little below full. when i cracked the tranny fill plug Nothing weeped out but i could still feel the level with the bent pinky finger check. probably could be a bad transmission seal, would it be damaged upon reassembly remating of the transfer case Or a faulty seal come from the Yota1 shop

in 5th gear at that speed range 50-70mph the stick wobbles vibrates like a hula dancer, it stops wobbling somewhere over 70. in 4th gear at those speeds there is NO noticeable wobble in the stick.

no 5th gear upgrade, i did not know that was even a thing LoL
the RPMs in the rebuilt do run a bit higher than my original R150F did, which may or may not contribute to the nearly 50 miles lost per full tank of taco juice

Nick told me it was rebuilt from an '02 Taco core...