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Won't shift out of high. I remember I had a **** of a time getting into low last time I tried... I can hear a faint click where the solenoid is but not the usual 'thunk' that you'd expect

Still exhibiting the same characteristics of not wanting to up shift from 1 to 2. However, on a nice downhill slope, I switched it from first gear to 5, and once he got past 2nd gear, it engage 3rd 4th and 5th and downshifted, with a distinct absence of second gear. So, if this transmission uses...

So, I replaced both the internal and external filter. I drained a hair under 5 gallons, and replaced it with Dexron 3. Got it to temp. Shifts into reverse and first just fine, but I was not having issues with that before. Did not have a chance to road-test it just yet but will give an update...

I put a new filter in. Old pickup tube did not have an oring on it. TM shows it's supposed to be there. I'm waiting for a ride to get fluid and another external filter.

This material was stuck in the filter. 3/8 drive 1/2" socket for size reference.

Having talked to the Allison guy. It seems that the modulator is fine. The next step is the governor assembly. However, I can't tell what's normal and what's not with the governor assembly. It seems to be Mighty floppy.

Looking from the pan to where the modulator is Mountain, there is a piece of metal coming from the modulator that looks shiny as ****. In my experience, shiny metal in an environment like that, means that something is rubbing against it.

I have first and reverse.

I appreciate your guidance. I was able to pull the pan. There is, what I would describe as a normal amount of gray ooze. That has been present in every transmission I have ever dropped the pan on. There's a little bit more that I'm used to seeing, but I'm also used to dealing with passenger...

I'll see what I can do about getting a catch pan that holds 5 gallons. I don't think Safeway would appreciate me dumping fluid in their parking lot.

Update: less than 30 miles later...won't shift out of first, just flares. Fluid has about 4k miles on it. Proper level, and doesn't smell burned.

Need help. Won't shift out of first. In parking lot. So, I parked my truck for 2 days, got back in it, and as I'm driving I noticed that it will shift from first to second but then it will stay in second until about 35 mph... Eventually it shifts. But it seems like the third gear is completely...