fyi trail gear rear leafs end up totaling 4.5-5" of lift when installed.
most aftermarket options will net 1.5-2" higher than the spring size due to relocating the hangers and using loner shackles
a way to go would be to french the hangers to lower the height and run a shorter shackle
here is my 81 with 2" of lift and 33s and you can see it doesnt sit very tall so going with a 4"total lift wouldnt hurt but I do agree lower is better
thats perfect or could use +1inch. i got to thinking when u messaged me about the 51" yota springs u might use, for i didnt know they had that length before the crappy tacoma springs. maybe those with no overload and a 2" AAL or added springs from another pack would be perfect.
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'81 pickup 5vzfe, r150f, 35's, welded 5.29's, f150 rear springs, Rears up front, TG dual adapter w/ 2.28's