Thanks for asking.
I ended up with removing all helper springs plus #5 and #6 in rear. (Riding empty is good but i probably need to add one leaf back if I'm going to carry any load). That's in addition to bringing the hanger in a couple inches. Front spring I moved hangers back about 2 inches...
REAR SHACKLE ANGLE
Ironman manufactures the rear spring length 1320mm with the pin right in the middle.
The FJ45/43 hanger points measure 1265mm. So if the rear spring is completely flat - which is probably unusual... then the spring eye would be pushed beyond the shackle mount by 55mm (a...
I only experimented with the rear springs and my modified pack seemed to add up very close to the numbers that the website generated (below)
Additionally, I am sure there is a much more complex formula for understanding the impact of the progressively shorter springs in the pack but the front...
So I have been working quite a bit to make the springs work with my truck.
I have learned there are WAY more variables to work with than I could have thought...
here are some things I have used to make my choices:
How much does my truck weigh at each wheel?
Interestingly - almost exactly 900...
FYI - my experience w Ironman4x4 springs has not worked out well: Ironman 4x4 lift on an FJ43 - https://forum.ih8mud.com/threads/ironman-4x4-lift-on-an-fj43.1303704/
i am just noticing the measurements from the FJ45 frame showing 645mm+620mm as below
and then Ironman4x4 TOY003C shows a spring length of 660+660 (along the spring)...
so if the spring was completely flattened out - it would be only 55mm longer than the eye-to-eye of the frame...
I think I...
I understand what you're saying now and i think that makes sense about stock height springs. original height makers are keeping same arch and eye length.
Seems like it's possible that the ironman springs i got might have the same length as stock along the arch which makes the eyes are closer...