Nice... evidently the anti-drainback valve is only good for building oil pressure at engine starts.
Good to hear that you're a fan of the Tundra setup. Despite the increased dampening, does it still have small bump compliance? Is the compression dampening too firm? Is it too firm on paved roads? Based off of how things ride now, I'm thinking that the front needs a softer setup or it will shake my teeth out offroad.
As for the rear, I'm concerned that a 906 would be too short for some of the longer rear shocks. I helped a buddy put a lift on his '97 4Runner w/ 906's with longer rear shocks and the spring would unseat in extreme articulation situations. I did a search to see if others had a good explanation of the differences between OME static lengths... here's an explanation from Valkyrie over on TTORA.
//SNIP// from Valkyrie at TTORA
Here's the scoop:
The 906 is actually a 'medium' spring specifically designed for the 4Runner. It results in about 2" of lift.
The 890 is a medium spring actually originally designed for the Prado (i.e. it is medium for the Prado, which is much heavier than a 4Runner). Figure 1.5" of lift on the Prado will be about 2.75" to 3" of lift on a 4Runner with a 330lb constant weight capacity.
The 891 is a heavy spring designed also for the Prado. It has a larger diameter coil, but is shorter in overall free height. However, with a rating fo 660lbs consant load, i would expect over 3" of lift on a 4Runner. I also think that it would be very firm.
//SNIP//
Sounds like the 890s would be the best candidates, but I'm shocked at how little information is available on spring and shock specs. Maybe I could call ToyTech and see if I could get some dimensions...
A jounce stop is another name for a bump stop. I work with engineers and they get uppity when I say bump stop... same thing when you say sway bar instead of anti-sway bar. The explanation they gave, to put it in perspective, is when you drive over a bump and the suspension is momentarily compressed, that's called jounce. When it springs back, that's called rebound. Hope that makes sense.