16' silverado transmission failing

[Jared Moore]

Hey guy my 16' 5.3 silverado transmission is not going into gear. So for the past week or 2 ill be driving 75-80 at about 2k rpms and it'll randomly kick when it's not shifting. Fast forward to 2 days ago I was driving on interstate and slowed down to about 20 mph and trans kicked into neutral and wouldnt go into gear. I finally got pulled over and it kicked into gear so I could get home. Now I start truck and trans will whine and go into gear for a minute then it kicks into neutral. But it quits whinning when it goes into neutral. Any input?

[rav3]

how many miles on it? has it ever been serviced? I assume it's the 6 speed 6L80?

[Jared Moore]

140k at about 20k mile 4-6 gears went out it was still under warranty then. Only time it's been worked on. Yea it's the 6L80

[CamGTP]

I'd say the front pump probably failed.

[Black02Silverado]

Sounds like the TC went.  It fills up the filter with trash and it can't pump fluid so it acts like it is in neutral.  So when you shut it off the filter kind of unclogs and when you start back up you get movement again until it clogs again.  This is what happened to our Suburbans 6L80.