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SignUp Now!Make sure you're using a wire brush or better yes a bench grinder with a wire wheel to clean the threads. Sounds like you may not actually be getting them torqued. Maybe hitting some grit. Either that or your u-bolts are stretching. Maybe a little loctite next time.
You may want to make sure the lowering block is tight against the spring and perch. I had to drill my center hole out. The bolt that goes through all the leaf springs would not fit inside the hole of the block.
I've had my drop (mono leafs) on for 8 years.....never once had to re-torque the u-bolts
Toyota spec is 38ftlbs. Doesn't seem enough to me
I think I did 80ish ft/lbs on mine
Did you try contacting XII Performance and asking them what torque settings to use?