What to do with my d4 7u

I'm not certain of scrap values in Rockford, but if the motor hasn't become stuck from sitting, the linkage trouble can probably be solved without too much trouble. If it is a steering clutch, and the change has been gradual, all it may need is an adjustment. The fellows at Patten are pretty good, so I'd believe his advice. What is of more concern would be the condition of the undercarriage. Large photos of the machine would help to give a better assessment. From the small image, it appears the idlers are pretty far out, so there may be limited life left in the UC. Regardless, if all else is fine, the machine may still be valued above the current scrap market given the rest of condition. Better pictures will certainly help.

If it's one of the steering clutch levers that's sticky and hard to pull, chances are it's the small needle bearings on the vertical shafts under the seat. They're at the top of the steering clutch compartments on each side and when they dry out, condensation gets in 'em as there isn't no oil cup for 'em. You can take the toolbox out of the seat and remove the inspection plate underneath and squirt some oil or loose juice on 'em. Also, the shaft the hand lever attaches to needs grease occasionally.

Oddly, every D4 I've seen that had the sticky steering clutch lever problem has been on the left side.

As far as value, here in the Pacific NW a running D4 (T,J, or U) can go for anywhere from $2500 to 4000, depending on condition and how it's equipped.

Yeah, don't scrap it just to get it out of there.
Hold the wife off for a few weeks to let everyone get through the Holiday.
I'm sure someone fairly local would take it.
Tell her you'll put it on Craigslist for awhile.