spring rates

I been looking for a few days trying to find the fact 2.4 std cab rear leaf spring rate. I know the fronts are 350ish according to rock auto and the v6s are 460ish. So I'm going to run 500s since inline 6 is kinda heavy with 22in ladder bars and 225lb rear coils. But I'm starting to think 225 might be too stiff so if factory leafs are around that rate plus 500s for leverage I know it'll be fine.

 

Does anyone have measurements for a 2wd base std cab front coils hight and width

 

Ok I got my spring out its 305lb spring weight in front about 15.5 in lond with 2 different end diameter so. I got a set of 550lb 13in for free so my plan is to get to 14in first then load suspension see ride hight and if I have to add of remove some material I want stock ride hight just stiffer

 

Here's with new springs and they are 650s I found the part number

 

She's a lot stiffer I got to get some stiffer shocks too to transfer weight faster because 1100hp is gonna be a ride in this little thing

 

^I bet 650s are a bunch stiffer... might as well throw a pic up of the truck's new stance!

 

I would but its in pieces doing a ladder bar with triangulated upper links. It actually sits in the old loaded position because the 2jz weight is so much more over 2rz (same position it was in just a lot stiffer)

 

Fitting the th400 trans