I have contacted Zone about this and they were very quick to respond with their lift is designed to work with OEM parts.
I personally installed my 3" Toytec lift about 3 weeks ago with 5100's, 2" add a leaf, silver 620# Eibach springs, differential drop, skid pan drop and Light Racing UCA's. At the time, I was torn between the 3" lift or 6" and I opted for the 3". I am now going to install a Zone 6" lift and my questions are. 1) Can I still use my 5100's for front and rear? 2) would it be beneficial to keep the lift spring in the rear and go with a shorter block? 3) Since I will be adding a Relentless aluminum bumper very soon, will the 620# springs be enough to overcome the extra 50ish lbs.? 4) Remove the complete Toytec lift and use stock shocks and stronger springs for the new bumper? I will be running 33x12.5x18 with 4.5" BS. I like the look of the extra fender gap between the tires in which the 3" isn't giving me. I do not do any heavy offroading but I do ride in the woods and mud at an easy pace. Hopefully this newb question isn't too confusing. I have searched for my answers but can't seem to find anything elsewhere that is similar. Thanks
09' Double Cab TRD Sport 4wd