I've had Terrafirma HD progressive springs and +5.5 pin to pin dampers on my truck for over 3 years, no problems at all, the dampers are much much thicker in diameter on the shafts than procomp es9000's, no bent ones or any leaks so far, the springs give about 2" of lift even with heavy guarding all over, ie: steering, track control, transmission and fuel tank guards with a roll cage and HD rear winch x-member and front 8274 winch bumper...a standard 90 would go up about 3" I would imagine..so a 110 would be similar
