I have a 99 EB expy that I lifted with the coil spacers and a torsion bar crank. I love the way it looks but now I have a nice driveline vibration. I knew there was a chance for it but figured it was worth a shot. Im wondering if there is a way to get rid of it? Its the auto awd model and it does it all the time, with or without the 4x4 locked in. It does it most on accel but will continue to hum even while coasting, its not as noticable under steady driving but its still there. Im guessing that I either have to bring it back down or have my blocks machined smaller. I went with the 3 inch ones which again I know are the biggest ones and the ones most likely to cause the noise, but I figured it wouldnt cost me much to have a machine shop turn em down a bit on a lathe. Whats the max people have gone without the vibration?
Also where do the blocks go, top of the spring or the bottom. If the top does the rubber pad go above the block in between the body and the block or between the block and the spring?
Also, might be related or might not, I havnt changed the shocks yet. It feels to me like they reach the end of their travel over the smallest drop off, like any downward movement of the axle at all is to much. If they are at the complete end of their travel could they be transmitting vibration to the fame/body that they normally wouldnt? While looking for shocks I have found rough countrys and procomps and bilstens that all say for 2-4 inches of lift but when I check the actual measurements of the shock on the rough countrys they are to long at fully compressed. I dont have the measurements handy but for example the stock shock compressed is 10 inches and the one for 2-4 inches of lift is 14. Doesnt that mean that at full compression of the suspension the shock will bottom out?
Need to get the shocks changed asap but dont want to get the 2-4 inch lift shocks only to have to drop the expy back down to get rid of the driveline hum and have the wrong shocks.
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