You'll be fine. If you look carefully during your install, you'll see that OEM Toyota springs are actually longer uncompressed than the 865's. What that means is that the OME 865's achieve their "lift" simply by being a stiffer spring and compressing less for a given weight as compared to the OE springs. Great for carrying a little bit of extra weight. Also, when extended the OME rear shocks are less than an inch taller than the Toyota ones. Short answer, you'll be just fine... ;pI have another question, if I put only the 865 springs will that be too much a stretch for the stock shocks? I'd love to just get them on there, then next purchase some new shocks.
https://forum.ih8mud.com/100-series...on-over-rear-shock-travel-options-really.html
