My view on the sub-soiler is that first, you'd probably never get enough traction on the tractor to be able to pull it in the first place and if you did, you would either kill the engine (speaking of gear drives), slip the clutch or perhaps break something in the tranny. I seem to recall some discussion that the IH gear drives are good for about 14 hp, even though a 582 is a 16 hp GD. Makes me wonder if IH did or changed anything with respect to the hydro drive tranny's to deal with higher hp in the design from the get-go.
On the other hand, a sub soiler in some smaller scale might be a cool implement to have in the collection.
Finally got around to changing the hydro fluid in the 126's tranny yesterday and changed the engine oil too. Next up is greasing the chassis and sharpening the deck blades and greasing the spindles. Thinking about being a little proactive and replacing the mule drive pulleys too. Tubes in the front tires are holding air great - first time this tractor has set in on place for a week and not had a flat....
Also bought some nuts and bolts. The QA for the deck on this tractor leaves something to be desired IMHO. I am going to bolt the sub frame to the tractor frame. Around my neck of the woods, there is much uneven terrain and not much in the way of flat runs - like in the midwest. Sometimes it's like you are mowing diagonal, with and across ditches at all times. I've had the 44A on the 109 and the 48" deck on this 126 pop loose when mowing. It has also happened when backing-up too. Bolting down the subframe will eliminate that. Nothing more embarrassing than mowing with the mighty IH along side my brother who is mowing with the MTD and finding myself on the ground trying to reattach a deck while he is mowing circles around me...
The Kohler in the 126 is the fastest starting engine in any engine powered anything I've ever owned - car or tractor! Generally I use a 420ish CCA battery in all of my tractors, but I can see something with much less CCA doing just fine in this tractor.
Maybe next winter, I'll pull it into the basement for a winter project. Go through the steering, maybe pull the engine and refresh the clutch and maybe some paint.
One other thing I need to look-into is the brakes have very little movement - if any when you mash the pedal flat. Brake pads look like they've got a good 1/8 of thickness on them, but the threaded rod where the brake/clutch gives the brakes a yank is threaded in as far as it will go for adjustment. I need to get into that too.
Also picked-up a coil spring at TSC for the clutch return spring.
The 126 is shaping-up into a nice working tractor and I'm looking forward to mowing with it this summer!