ECGS Bushing
I realize this is an older thread but since I was surfing around it today (looking to solve a different issue) I thought I'd throw a little info out about the ECGS bushing.
I have a 2013 Tacoma Double Cab and immediately upon buying it, I lifted it 3" (front) 1.5" back and within 2,000 miles developed the oscillating vibration from the front end...which would disappear when 4X4 was engaged. Needless to say that was super discouraging since I'd barely broken the thing in. I'm sure like everyone else, I took to the internet to try and diagnose it before taking it back to the dealership just so I'd be armed with the information if things got sideways with them. Fortunately (or unfortunately) I wasn't alone in this and the topic of the ECGS bushing came up several times. I debated whether to do it or let the dealership solve the problem for a couple of months. Took it to them and naturally they reported "operating normally". Within two blocks of driving away from the dealership....whir, whir, whir, whir.....and I was back to square one.
I talked with a fellow Tacoma owner (2011 Double Cab with 3" lift) here and he said he got the same thing and Toyota wound up replacing his entire front end. He also said his tech support guy at Toyota said they knew about the issue and were "working on it". As of July 2014 there are no TSB on it that I know of.
That said I talked to the guys here in Golden at Slee Offroad, told them what was happening and they quickly mentioned the ECGS bushing (as well as another bushing option). I decided to roll the dice and just have the driver's side diff bearing removed and the bushing installed to see what would happen. Happy to report that 4,800 miles later I haven't had one vibe since. I've read a couple of blogs from people who have also done it and are reporting well over 50,000 on the bushing with no problems. One guy put 40,000 miles on teh bushing, removed it to test for degredation and wear and reported little to none. The bushing itself is about $40-$50. I understand it's not that difficult to replace yourself but I opted for Slee to do mine and of course they did a fabulous job.
Anyhow, thought I'd throw this out there in case there were others like me who happen upon this thread and might use the information. Now off to solve CV angle issues.