If your truck had a hay rack attached to the roof, I'd accuse you of stealing our ride & improving it!!
Your rear springs are exactly what our truck needs. We had torsion bars adjusted to try & level it as our springs are weak. I can see you take very good care of your rig. How many miles? Is it the V6? A CA or Fed model?
Please tell me if you use aftermarket or Toyota springs. What about brakes? We need to do the front on ours...
My advise to you. I notice you still have original exhaust. We are lucky that ours is a Fed model--only 1 O2 sensor. What about yours?
I can refer you to the specialist who custom did our exhaust as a cat-back. Larger cat, larger pipes plus larger muffler, big difference in performance--ESPECIALLY in heat transfer. Now our firewall & floorboard is cooler.
A problem that caused the old weak head gasket to fail (almost ALWAYS) at #6 cylinder is b/c that's where the exhaust "y" is located. Heat from that is directly below #6 & is causation for head gasket failure.
We were provided by Ed Hanson some fiberglass welder's cloth that I'm going to tie up to further protect the engine from exhaust "y" pipe heat.
Have you encountered any drive shaft problems? Such as transfer case & rear driveshaft issues?
Do you run a K&N air filter? Iridium plugs? Wires?... Please let me know.
And thanks for posting re your spring job. That is a fun job & instant results gratifying.