Well I purchased a set a rear Timbrens for my truck. After one week of testing, I decided to return them, here is why. Extremely easy install, that's a given. They absolutely minimized the rock...
Timbren's were the best thing I installed on my Ford F350 SWR Along with sway bar made driving truck with 4000 lb TC a dream. You need to work out your installation issue something is wrong.