I installed them on a 14 year old Tacoma 4X4. I used to have air suspension with Timbren bumpers as a backup. After 13 years the airbags were leaking so I removed them and left the Timbren fenders. Then I received several new rear leaf springs for free through the Toyota TSB program. Unfortunately, this lowered the back of my truck by almost two inches. I removed Timbren fenders in front of the TSB on the recommendation of a service advisor. I tried reinstalling the timbres but they barely touched the frame and made the ride very stiff. Ground clearance has increased from 6.25 inches to 4.6 inches, and Timbren's headroom is 4.5 inches. I removed the timbre and installed factory bumpers and dealt with rear sag until I bought and installed these sumo springs. Because sumo feathers are 6 inches. They raised the rear of my Tacoma almost 1.5 inches. The ride isn't as bad as I thought it would be. Really very solid like a brand new standard 4x4. the height of the truck did not move. I can handle tougher driving with ease and have no regrets buying these expensive bumpers.
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