I finally got the chance to install the OME 2720 rear springs with the Bilstein 6112/5160 kit. Big trip coming up and it was a great motivator.
I installed the OME "A" spring on the PS and the "B" spring on the DS.
Front springs are on the first (lowest lift) height.
Before in driveway with Bilstein rear springs (medium), no 3rd row seats, half tank gas, maybe 50lbs extra weight in back:
RR: 22.5"
LR: 22.375"
After in driveway with OME 2720:
RR: 22"
LR: 21.25"
I suspect the difference was due to the KDSS as I disconnected the sway bar end link on the PS.
After a drive around town and gas fill up. Drive included several corners and a few speed humps at 40mph.
RR: 21.5"
LR: 21.375"
RF: 20.75"
LF: 20.625"
I was parked in a parking lot with a very slight slope towards the DS. I suspect if the ground was perfectly level, the measurements L/R would be identical.
Impressions:
I lost an inch of height in the rear which is fine by me. I may switch to OME 2721 in the future if it sags too much when loaded with gear.
Spring rate doubled from 170 lb/in to 350 lb/in.
Ride was firm but not harsh. It felt amazing, but I understand this is subjective.. It felt like the truck should feel. Of course this was only on a quick drive around town. I can report back once I get more miles on it, and after the trip.
Anyhoo, let me know if anyone needs more detail.
And since I know the next question will be "what size ties are those?", they are Toyo AT3 275/70R18