Reverse is worse, and con'ts into 30 smph and above; forward smooths out above 20 smph. PS2.0, 3 v system, tach reader and tach tape have been replaced; no improvement. A motor was replaced, also w/o improvement, so the original motor was reinstalled. 489 scale miles, and 11 hrs and change are the numbers. This whole embroglio began when I changed a thrown traction tire, and it's run funky since the initial reassembly. Ran perfect prior to that. Any other ideas?
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Mark,
Just to cover all of the bases, is there any chance that a piece of the old tire got up into the gears?
I've relubed the gear boxes, Barry, but will confess I didn't look specifically at the idler gears. I will do so forthwith. Thx.
Since it started after throwing a tire, I think Barry is probably right on here. I had that happen once, but it actually totally stopped the works, so it was easier to find. 
Wish it were that simple, guys, but no tire or tire fragments, in the idler or worm gears. Thx.
Mark,
Make absolutely certain that when you reinserted the motor worm gear into the gearbox that everything seated correctly, and that the worm gear is all the way into the gear box..
We have a LO-V with similar symptons, slow or stuttering, etc., and it turned out the the receiving block for the truck mount screw was stripped and the worm gear was getting cocked. If you have disassembled your truck blocks, make sure everything seats properly. FWIW
Will reassess both trucks and motor assemblies.
I don't think this is your case but I just had a Legacy acting "goofy". Erratic starts. Varied speeds. I was going to do an engine reset. When I turned engibe over to slide program switch i saw the problem. Odyssey switch was turned off. Sometimes it's the simplest things.
Was it in consist when it threw the traction tire?? Can you spin the flywheel freely by hand? If you attach power leads directly to the p/ups (3/2 trucks?) does it smooth out?
You probably went threw these, I've just seen a lot when I buy used engines. Pinched wires, scrambled boards (soundsets), etc. For me, it's usually something simple like these. Sounds like you have to get a bit deeper. Can you swap boards? Make sure you use a small fuse in line or between the power supply until you find it. Methodically you may have to rule out stuff.
Mark,
If you can, Put a dot on a wheel in the front truck and a dot on a wheel in the rear truck and make sure both wheel sets are turning at the same speed.
If the are not turning the same RPMs, the problem could be something stuck or even one set of wheels is slipping because of lube on the tires. Male sure the plug on the end of the board with two yellow wires and two white wires is fully seated.
Dave
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