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Converter ended up being the problem - just took a minute to warm up and relearn I guess, Runs perfect without the exhaust connected

Have you drained the gearbox oil and see what comes out with it? Also carefully feel around inside the gearbox through the drain hole for any other fragments that may be present. Noise will travel to different areas. You’d need to use a dowel/long screw driver/stethoscope to pinpoint where the noise is coming from more precisely. Seems more likely that second gear is chipped, possibly both gears - if that’s the case you’d get an un-rhythmic sequence that will repeat after some time. This is because all gearsets have at least one gear that’s got an uneven number of teeth so they wear all teeth against each other for even wear across all the two gear cogs’ teeth.

Better to change a manual than auto trans!

Yeah fair enough! You didn’t do the “mandatory” double pump if the throttle before turning the ignition on? Or the other way to do it is ignition on to prime the fuel bowl, ignition off, double pump, ignition on and start. I do this one when I haven’t driven my brumby in a while, especially in summer when it seems the bowl evaporates and needs filling again.

It's a Bambu P1S. I have never used one but first job I sent to it was this. Was a big hit in the office.

That pretty much confirms it's inside the trans. Though, when I had 2nd let go on one, it broke off an entire tooth on the small gear only make a light clicking noise, and lodged the tooth in the center section. Draining didn't find anything, only taking apart showed the issue. Though with how old yours is, it might also be loose bearings causing enough slop to make that constant noise

For functional and tough parts my go-to is Armadillo by Ninjaflex. It's a very high hardness TPU so it acts like a normal rigid polymer but it has a very high bond strength between layers. It takes some tweaking to get your settings dialed in and may require dual-extrusion or a multi material unit when you print support material. Since it bonds so well to itself, getting supports off without cutting and sanding tools isn't easy. The best overall bed adhesive that works with almost all polymers, that I've found, is normal white school glue spread with a damp paper towel (3 quarter-sized dollops spread thin). Once that dries, lay a layer of Magigoo PC bed adhesive over that. That coating will last 3-10 prints before you wash it off with dish soap and reapply. I've wanted to print a cup holder. Right now I'm just using a cardboard drink carrier I got from a coffee place on my passenger side floor board.

I haven't posted here for years, partly due to login issues. @Turbone fixed those for me recently (thank you!). All the Subarus I had before have moved along, but I have more than ever before - 2006 Outback Wagon, 2004 Legacy Wagon, and the newest arrival is a 1994 Loyale AT my son just bought. The engine is suspect from a large oil leak that resulted in the engine's being run low on oil. We'll see about the leak and then if the noises clear up. His goal is to put a dual range MT in is but we'll see how easy that is to find...

In second gear, when you clutch in does the noise go away?

It was a terminal connection issue coming from the driver's door to the dash harness. The hatch still only works as manual. That's less annoying than manually locking and unlocking doors from the inside so I'll leave it for now. That breaking noise I heard I believe was a locking rod disconnecting from its socket. One on the driver side was only semi-connected.

I had an 05 Outback and in chasing the dreaded P0420, I was "thrilled" to discover that there were 3 cats and 5 oxygen sensors. Somewhere there is a Subaru engineer busting a gut with laughter... and a parts manager handsomely salaried.

That’s an interesting one! A chipped tooth will make a rotational clicking noise that’s speed related and only when in the chipped gear. That noise sounds like something is grinding - and interesting that it’s only in one gear. Other thought is that it’s multiple teeth that are damaged - unlikely though as the gear would most likely strip as a result, but anything is possible. Hopefully it’s something simple.

Possibly clogged cat converter(s)? Broken bit's of the honeycomb will follow gravity and clog the exhaust when car is heading up hill. The noise will startle the neighbors but if you can disconnect the cat(s) and test drive, that will help in diagnosing this issue. Buddy had this issue and just emptied the broken bits and drove on.