Might be a NV1500, 2500 or 3500. If so, they are better gearboxes than a T-5.
I believe the 3500 has a super-low granny, which is probably useless to you. Either way, endeavor to perservere. You are on the right track.
BTW, I think it is smart to establish baseline improvement on dino-diesel before wandering off into the mysteries of WVO.
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2000 Ford F-350 SC 4x2 6 Speed Manual
4" Slam
3.08:1 gears and Gear Vendor Overdrive
Rubber Conveyor Belt Air Dam
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