03 6.0L torqshift no engaugment after reving in park or neutral

[toddfez]

Been batteling this for months now. This is what i know. I rev it up in park or neutral and go back to drive or reverse and i have no gears. The dip stick shows no fluid when this happens. But it's full to the mark when it's shifting fine. Replaced line control selenoid. Fluid is clean both filters changed still happens. Put it back in to gear rev it back up and it slams into gear. Then shifts fine. Good hard shifts no slipping. Any ideas would be help full. I do have s.c.t. egr delet put in stock mode still same thing. I do have autoenginuity on my laptop. I'm very good with engine problems but just don't know what im looking for with the tranny side of things..... thanks Todd

[DesertSmoker]

This sounds like a pump issue. Between the fluid showing up then disappearing the possible culprit is the front pump but something stuck n the valve body could produce the same problem.

[dazdillenger]

Check your inline filter. Does it make an audible whining when it does this? I take your post to mean this is an intermittent problem?

[toddfez]

Yes it is intermittent. No noise from it when it happens. I've changed the in line filter. Checked it is a fotd internal filter. Has anyone heard of an updated valve body?

[dazdillenger]

does the tow/haul light flash when it occurs?

[toddfez]

No light and no codes. I can make it act up at any time. I've let it sit over night still nothing. Till I rev it in gear and bangs back into gear. I have no line pressure when it happens. But it's also low on fluid to until its back working again. Then fluid is full. Where is all the fluid going?