My legends prep.
I did not remove the tyres from the wheels, or the wheels from the axles. Just popped out axles and glue and true. Superglue on fronts.
I lowered the chassis, in hindsight this probably was not necessary, all bushes JB welded in place. I forgot the side play in the front axle on 2 of the cars, so they still have some side to side play.
Guides were too sloppy for my liking so I replaced them with scale auto ones I had on hand.
Replaced motor wires, glued motors in place.
Added a chunk of church roof in the middle, to approx 75 gms running weight.
2 of the house class cars got superglue on the spur gear in the build, as they were loose, I fear the spur and wheel may be superglued together.
the 3rd car felt ok so it was not glued but was spinning on the night!!
I did not add a guide adapter, brain fade, I will add them.
The cars come with 12 tooth pinion and a 13 tooth for high speed tracks. I will compromise by replacing the spurs with 32 teeth, down from 33 teeth. this is about equivalent to a 12.5 tooth pinion? I am ok with the plastic pinion gear.
They feel subtly different, easier to drive, but that my be just because I am playing alone when the cars always go better.