Springs should be stamped or printed with D/S Front, P/S Front, D/S Rear, and P/S Rear. Unless TF changed how they label their springs.

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I installed the same kit from Lucky 8 last May in medium duty and yes they are labeled as mentioned. My passenger rear sits about .5" lower than the drivers side. Being about 99% sure I got the spring in the right spot, I don't know why other than its a oldish truck and maybe its normal for TF tolerances. Only bothers me when I look at it from the back in the driveway. If I get bored some Saturday I might try to swap over and see if it levels out. Other than that I like the ride. Shocks can be pretty stiff on a cold morning but I also have E rated tires so I deserve it.

 

Got back to the house and sure enough they are labeled PS and DS.. In fairness it's the lightest labeling ever, barely see it..lol ! Thanks for the help.