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Autel Elite, SnapOn etc. I'm a mechanic.

Finally I replaced a torque arm with an OEM. Now I feel just a little vibration but a brend new OEM tensioner still slightly jumps. Like I said I put a new harmonic balancer and belts. Still no codes(never seen any codes). I tried to spin alternator and AC pulleys by hand, could not feel any problems with bearings...

Mine is AWD and the PTU drain plug installation was my dream(finally done it a month ago). The only thing: how could be V and LV totally incompatible if most of the part stores sell universals ATF and it works??? I am waiting for OEM torque arm, couldn't get one from the dealer but finally I found one on eBay. Mine OEM torque arm's front bushing was torn, that's why vibration appeared(I thought). I got an aftermarket torque arm from eBay and then I found this forum and a post: The OEM mounts are a composite of two different types of rubber with softer inserts.

why everywhere says that V and LV are NOT compatible? And they say DO NOT mix them. Looks like the difference isn't that big according to specs... 3.000 miles ago(the mileage was 115K) I decided to change the fluid, using AllData got confused reading this: " NOTE: Transmission fluid application: - Early build vehicles require MERCON(R) V - Late build vehicles require MERCON(R) LV" IDK why I didn't take a look on the dipstick cap(it says Mercon V) instead of I called the dealer and they told me LV(for my 2009 MKX). I changed fluid 3 times and everything was fine within 3k miles. Than it started: VIBRATION at Stop(traffic) lights. Almost no vibration in Neutral Only. Reading/trying for 2 mounts - still nothing changed. DONE: Harmonic balancer(did not help). Tensioner + belts(same problem). Right engine mount + torque arm(still nothing). Performed transmission line pressure test - got readings ~ 5% lower than AllData says.. Trying to think it's a torque converter? Would it happened because I put LV instead of V? Any ideas? Thanks. PS: new phazers, timing chain, water pump, spark plugs + coils etc was done at the time with tranny's fluid change. NEVER any codes, very gentle driving, full synthetic every 3K miles...