[FordeatinZ71]

ok, let me help here...you don't see oil because you aren't leaking it. you're using it. it happens. honestly, all vehicles use SOME amount of oil...but newer motors will not use a noticeable amount in the 3-6,000 mile intervals most people change the oil in. did you ruin your motor? nope...didn't even hurt it...i promise ya.

now, let me tell ya a couple stories about my '91 K1500 in my sig. it was the exact same truck as yours drivetrain-wise except for you having the 4L60E and it having a 700R4. it leaked oil AND used it. had 180k HEAVILY neglected miles on it when i got it. i would put oil in it...run for about 3 weeks-1 month and i would see the gauge start to drop to 0 or close when i'd stop too fast or take a sharp corner...then i'd add oil...was it smart? probably not...but it worked for me...

another time, i was pulling a '97 Monte Carlo i got back home and ran it so low on oil the lifters were "knocking". i thought i had cooked it...nope...put oil in it and what do ya know? lifters pumped up and no more issues!

yet another time...ran it low enough the lifters were knockin again...thought it was done this time...nope...just needed some oil.

it didn't DIE until my friend ran it without oil for God knows how long (temp gauge had even gone up to 210-never went that high) and it locked up while he was RACING a car on the freeway...

so yea, these 350s are pretty resilient. i wouldn't be too worried.