The main, normal, springs are soft enough that with no payload and no air in the bags they compress onto the overloads on every auto-level truck I’ve played with.
Since you have tweaked your sensors to a feeling in the bags of no air are your main leaves riding on the overloads? You say they aren’t, but that’s not my experience on multiple trucks. If they aren’t, how much clearance is there? Have you tested it with a full vs empty fuel tank?
With your tweaked sensors and a dump of the bags (bed lowering or transport mode) do you hear/feel air blow out the vent?
Both my 3500’s were well above the overloads in normal, but dumping the air from the bags manually would drop the truck onto the overloads with no added payload.
The drivers side bag should have more air than the passenger side bag due to fuel, DEF, and driver… standard weights the passenger side doesn’t have. The leaf springs have the same rating so the airbags are what keep it level side to side. There are trucks that were improperly setup from the factory thou, like they did the calibration with the wrong fuel weight… makes me wonder it has anything to do with the 50 gallon tank option and basic weights for programming, even on trucks that don’t have the 50 gallon tank.
I also don’t think that LB vs SB is a difference as the CCSB version of my truck only has a published RAW of 30lbs less than my CCLB, and CCSB Rambox has a higher RAW. The only truck with a significant difference is the RCLB truck.
AH64ID....thanks for the info. This is a perfect time for me to do some checking as I just filled with fuel. Mine is Crew Cab Standard Box...everything factory including stock 20" wheels and tires. No Rambox.
Crawled under the truck this evening and saw the following. I have 1/2 full def and full fuel tank. Truck bed is totally empty other than tonneau cover.
1. Both bags can be pushed in with my thumb.
2. On both driver and passenger sides, the rearmost overload rubber cushion is just touching the lighter weight primary leafs.
3. On drivers side, the frontmost overload rubber cushion has a very slight gap to the lighter weight primary leaf. Gap is like the thickness of a quarter.
4. On passenger side, the frontmost overload rubber cushion has a 1/4" gap to the lighter weight primary leaf.
When I go into bed lowering mode, I hear the compressor system go through its cycle, but in the end there is no change in height. Bags feel exactly the same when I press them with my thumb.
Questions.....
I believe you're in the camp where bags should always be firm, and when empty the truck is riding on both the bags and lighter weight primary leafs.
1. What overload rubber cushion gaps would you expect to see on an empty truck? (sorry if you already posted this)
2. What process do you use for setting the sensors on each side of the rear suspension?
3. Have you ever been able to see what the calibration process is in the RAM service manual for our trucks?
Thanks!