vibrations!

Just put my 5100s on with a 3in block level. Now I'm having terrible vibrations at 25-35mph worst of all when I'm slowing down. The truck has been aligned. Any ideas?

 

From everything I have read anything over a 1 in. lift in the rear our truck get a terrible vibration . It is that fact that keeps me from lifting the rear of mine !

 

Brand new here, but I've been looking at suspension stuff and came across this page about driveline vibrations that might come up if you change the driveshaft angles:

http://www.4crawler.com/4x4/CheapTricks/Driveline-101.shtml

It's pretty dense reading and not Tacoma-specific, but there are bits about vibrations that start/stop during coasting, accelerating, decelerating, etc., so it might be something to check..?

 

I feel like that guy on the radio who says he's a first time caller but long time listener. First post! w00t!

My opinion is based on my experience, which is limited. I had a similar issue and I have a leveling kit which gives me a 2" lift. I had vibrations right around 25-35mph as well and it felt like I was going over a washboard. If I let off the acceleration when it happened it would go away. I went through a bunch of minor tests with no solutions. I thought my transmission might be going out. Took it in to get assessed and they lubed up my u-joints in my driveline and put in a anti-vibration liquid into my transmission. When they told me I thought it was a joke. Sounds like something from Harry Potter, but it made all the difference and haven't had any issues since.