Sorry
@skhochay, you are wrong, saying that frame to bushing needs a spacer due to bevel restricting bushing from seating. Unless you've some evidence to show other than a drawing you made. Picture of actual tell the store: see below!
Above I asked you
@skhochay "Where or how is it, you came up with your answer as to what spacer is for?" I'm not try to box you in. As some on mud do, playing their big shot games. Nor was I trying to shame you. I'd just like to know how you came to this conclusion. Which you've not responded to. You also hit my Youtube with some "expert statements".
Which you've prompted me to look at this spacer issue again. So here you go:
I may or may not have nailed it as
@abuck99 suggested. It looks to me: no, one or more spacers can be used to get proper fitment with LCA. Which I only found the need for more than one spacer, once! I have always used at least one before this, just because factory had them in. But looking closely, I can see non need be in if that allow better fitment LCA into bushings. The goal is to get a relaxed fit, that is not putting any lateral pressure on bushing. IDK if spacers can also be effecting alignment, but it very well could be. But it's clear looking at the frame receiving end and bushing. Any minor bevel in bushing will not interfere with seating.
It's also possible the spacers have more than one purpose. Like cone washer of the hub flange. A friend, an engineer for over 50 years. 30 years of which was in aerospace building rocks (rocket scientist, as they say). Agrees: Cone washer are a disposable part that do more than just centering hub flange. The gap/cut in them, allows for flex. I'll run this spacer issue by him, see if he see other possible reason for them.
When I first had fitment issue of new OEM LCA and new #2 bushing. I was faced with either putting excess and constant lateral pressure on bushings rubber core, or adding more spacers. I chose to add more spacer, to get bushing in neutral stance during install. Same as why we do not torque control arm bushings bolts/nuts, lower shock bolt/nut or links lower bolt. Until on the ground in a neutral stance. If these torque while wheels hanging off the ground. They'll lock in bushings core, at dropped lower control stance we happen to be in while wheel hanging free. We then place wheels/tires on the ground and rubber core ends up under constant pressure/load. I've marked links torque in while vehicle on jack-stands, which is wheels hanging freely. Then place vehicle on the ground, and loosened the lower link bolt. Bushing of link turned almost 30 degrees once released. So any factory bushing that metal core is stationary. We always put in neutral stance, before torquing in, so they're not under constant load while vehicle in neutral stance. So it only made sense to me, we don't want lateral pressure/load on bushing either, once in a neutral stance. So I surmised, they give us spacers to correct for variation in fitment of manufactured parts i.e bushing, frame and LCA!
I did look in FSM, FSM in TIS of all 100 series years, along with Toyota training (school course). I found nothing on spacer. Spacer only show up in parts diagrams, that I've found.
This doesn't mean I'm right. But, my adding spacers, did get result I felt needed for relaxed fitment. The vehicle I did this on: Owner has reported to me: "It's never tracked or handled better". I do kind wish I'd only added 2 spacer. As with 3 spacers, bushing stuck out kind of far. So much so, I went back and measure how much of bushing was captured. Which seem okay, but I'm not and engineer. So far all is good. Hope I see this heavy built rig again and again over the years and miles. So I can see how 3 spacer perform.
Here is a picture of the receiving end in frame for bushing. I clearly see a negative bevel, which is much greater than positive very minor bevel on bushing. So I don't see any need for any spacing, to correct for casting bevel of bushing. So using no, 1 or 2 to spacer to get relaxed fitment seems fine to me. 3 is maybe pressing it a bit IDK!
View attachment 3064098
Look at very top. You can see, their is very very little bevel on bushing
View attachment 3064112
View attachment 3064111
View attachment 3064108