Anyone have any 4800# (LAV) Tremor or 5200# (LAT) takeoff coils they want to sell?
ZooDad
I bought my 5,200lb (LAT) Tremor springs on ebay last fall to replace my non-tremor 4,800lb. That is a good place to keep an eye on. You can also check with local shops that do a lot of suspension work. I couldn't find any local, but I'm not in a high-population area. The number of owners that pull off all their Tremor suspension and replace with Carli or other, you'd think we'd be swimming in Tremor springs/shocks/blocks take-offs. Thankfully, brand new springs are not crazy expensive.
My ebay Tremor LAT springs came with their Tremor shocks, which I didn't want/need but that made the $350-for-all price worth it. I could sell just the shocks for that and effectively get the springs for free. Or, I'll keep those shocks laying around in case I want to install them when the Fox 2.5" Performance Elite are occasionally getting rebuilt. That would mean I could throw on the tremor shocks in the fall and send out Fox for a rebuild over the winter. Then re-install them in the spring.
Camper is on fulltime. I don't want 3.5" plus of overall height increase, hence why I'm going from non-tremor to tremor springs which are 1" taller. I have two friends with the same truck and camper, so similar fulltime payload, that have done this same swap; Gone from non-tremor to tremor springs but also bumped up spring weight from 4,800lb to 5,200lb. And, we all have similar 1,800 - 2,400 lbs of payload fulltime depending on the day. Between the 1" taller spring and the heavier spring rate, with the camper loaded, their front ends, after settling, are sitting 1.5" taller, which is exactly what I'm after. 1" is lift from taller spring and 0.5" is sitting higher within the travel due to increased spring rate. And this update adds/moves that 1.5" to compression travel which is good because Superduty have a lot less compression travel than rebound travel in stock form. This helps balance that and split suspension travel 50/50 between compression and rebound travel, which is where you want it on a overlanding rig. Adding compression travel should have me hammering the bump stops less often on the trails (Adding the Fox 2.5" performance elites will also help greatly in that regard). Front anti-swaybar will be completely removed.
Long term, I'll do full progressive leaf pack in the rear, but for now, I'll install an add-a-leaf (1224 LB) which will have the rear suspension sitting 1.75" taller in the suspension travel due to the added spring rate. This will have me sitting with a small amount of rake (.25" taller in the rear with camper fully loaded with water and supplies, passengers, full of fuel, tools/recovery gear, etc.) which is where my buddies' rigs are sitting. However, I sometimes have 300 - 400lb of tongue weight (fishing boat, enclosed trailer, dirtbike or MTBs on receiver rack, etc.) so will sometimes compress rear suspension more than that. I do like some rake, even when loaded, so I may also swap the non-tremor rear block with a Tremor block to add another 1" to the rear which will give me slightly more departure angle and keep me from being squatted with tongue weight added.
Note: Adding tongue weight not only adds that weight to the rear axle, but transfers weight off the front axle onto the rear.
For example, I scaled when fulling packed for a week long trip. The boat was 360lb of tongue weight, but added 560lbs to the rear axle (360lb from tongue weight and another 200lb of weight moved from the front axle onto the rear axle).
Truck/camper only:
Scale: 9,640lb (4,500F/5,140R)
Payload 2,435lb
Re-weigh with fishing boat hooked up.
Scale: 10,000lb (4,300F/5,700R)
Payload: 2,795lb
My main reason for adding the lift to my non-tremor at all is to fit 37" tires. I'm a big fan of fitting the tallest tire possible with the shortest lift possible. Larger diameter tires give better rollover and increase axle ground clearance where suspension lift results in only increased chassis clearance. We already scrape through the trees on the trails we frequent and I want to keep overall height increase to a minimum, hence my desire to add clearance through tire size rather than only suspension lift. Meaning, I'd rather add 2.5" of overall height (37" tires and 1.5" lift) than add 3.5" of height (same 35" tires but 3.5" lift). Yes, adding both 3.5" lift and 2" taller tires (1" axle clearance) would be great, but just don't want to live with an overall height increase of 4.5" over current (3.5" lift and 1" taller from 2" tire diameter increase). Because of that, the easy and common mod, of just throwing on both a Carli 3.5" lift and 37" tires, is not an option for my use case. 
bds-suspension.com
