Steve may very well be correct. Look in just about any Toyota FSM for a front coil sprung 4x4, and you will see a diagram specifying the orientation of the coil springs to strut to frame mount.
You hardly ever hear anyone mention this when doing their own front strut replacement, but I gotta figure if Toyota took the time/effort to draw up a diagram and include it in their FSM's, then there must be a good reason to follow it.
I have the manual for '05-'06 Tacomas, but when I save the relevant page as a .pdf to attach here, its a few KB too over the attachment limit for the forum...
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There is one in the '00-'02 Tundra FSM, that is QUITE different from the one I saw in the Tacoma FSM.
As to the coil insulators (yes, thats what they are called
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) I am not sure if Energy Suspension has them in poly. I know Wheeler's Offroad has about the best price on isolators....I dont remember if they are rubber or poly.
I CAN tell you NOT to buy KYB brand rubber isolators. The ones I bought not even a year ago, are already cracking severely. Label on box says "Made in India"...
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I got mine at RockAuto.com
As to what setting to go on the 5100's, hard to say...Since you are basically using coils/struts from a completely different/heavier vehicle. I would say you REALLY need to talk to several people who have already done this same swap, with the same coils/struts you are using, AND with heavy bumpers/winches.
I guess other than that, I would split the difference to start with, and go with 2nd or 3rd notch. (Incidentally, the 5100's have FIVE actual notches...But most people refer to one thru four, leaving out the very bottom notch...I guess because bottom notch is 0" lift..??)
I got lucky when I did an OME 885/5100 swap on my '00 Tundie, in that there were quite a few people who had already done this swap. THAT being said, there were HUGELY varying lift results that everybody had... ?? SO even with quite a few people's experiences to work off, I had to go with my gut instincts as well. I managed to hit right where I wanted to be at just a hair under 2.75".
And, are you saying you are going to use a top spacer IN ADDITION to the coil/5100 lift?....Generally its pretty much frowned upon to double-stack different types of lifts. If you wanted that much more lift than the stock Tundra coils can give you, you might have been better off buying new aftermarket coils like the OME, Toytec, Eibach, Icons, etc...
And actually, since the spacer is thrown into the mix, I would say you'ld be better off just maxing out the 5100s on top notch, and leaving out the spacer...If its still too short for you, I would go with aftermarket coils and sell the Tundra coils and spacer.