518 46re smoked

The L/R band is used in both Low and Reverse.Edit Manual low uses the L/R band
Reverse needs the Hi-clutch to work, and Low needs the Forward clutch to work.

But with NO manual VB
and to get first gear in Drive, the rear sprag is used. And you cannot get any other forward gears until the governor commands a shift. So if you select second or third at a stop, you will not get either until the governor pressure is up there.

So now, new story.
With a factory VB, and having reverse only, no matter what selector position is selected, the rooster comb is probably disconnected.
But if you have a neutral and Park, then the rooster comb is good, and I would guess, your hi-clutch is not disengaging, along with a failed forward clutch; same diagnoses as previous post.