It's an E4OD
, behind a 7.3, w/transfer gear case in an E350 camper van. 191k on the clock.
Symptom #1: When cold, it seems as though the torque converter locks up, typically in reverse, enough to stall the engine. It goes away after a few minutes of warming up/fluid circulation. It's an intermittent problem, happening off and on for the last 5k miles.
New Symptom #2: Loud ratcheting sounds, as though it's partially popping out of gear, trying to find it's way back in, only on deceleration. Zzzzzzzzzzzzz! The clicking period gets further apart as speed goes to zero. AT highway speeds it'a loud buzzing. I did my best to diagnose it, before the transmission completely gave up the ghost. This just started, my van is now parked at home until I fix it.
It happens in every gear, both w/overdrive on and off. Overdrive is functioning properly, no flashing light, as is up and down shifting. It happened once on an offramp three days ago, then happened 2-3 more times in Death Valley while descending the South Pass (alluvial fan dirt road w/rocks, bumps, etc) into Saline Valley.
On our way out of the valley, it got reeeeeal bad, it did it on every deceleration headed toward Hwy 190, even on pavement. I had to abort our holiday trip and head home.
Luckily, I was able nurse it 350 miles back home to the Bay Area, having to brake with a little accelerator at the same time, to keep a load on the gear train on even the slightest grade. So long as the gear train was loaded by the engine, and NOT being backdriven by the wheels, it propelled my E350 van down the road at highway speeds. I'm just glad we didn't need to have it towed, as I was fully loaded, and flat towing my Samurai behind.
I've been doing some internet searches, and don't see anything associated with deceleration. I really want to diagnose this thing before taking it out (myself).