Lisa S St. Peters , MO July 03, 2016 Appliance: Whirlpool Washer WTW6400SW1 Whirlpool Washer Wtw6400sw1: Ul error code. How to replace Suspension Spring Kit. My son replaced the suspension rods.He has never done this before and watched a video, Hardest part was lifting tub and rod enough to get plastic clip on. Do-It-Yourself Rating: Repair Time Estimate: 15-30 minutes