1959chevybr
Well Known Member
Help! Help! Help! Please!!! The scourge of disappointment is starting to settle in and I am the guy that almost always has a smile.. All the issues previously discussed are fixed. I now have a smooth running rear end on the lift with the wheels up and up on the jacks. All is running smooth and true until 58 MPH and even then the wheels and tires run true, the vibration on the lift if mirrored on road test. I also have considerable shutter on takeoff. These are the things we have done, new axle, removed wheel spacers, 3 sets of known good tires and wheels, 3 different balanced drive shafts and a different center section. To regress, it is a 4L60 trans with a longer length, shortened drive shaft. We have raised/lowered the engine, installed new stock height CB and one we modified to 3/4 shorter. We have maxed the amount of shim possible for rear do to length of bolts and removed systematically until there were none. The engine and first shaft have had the same angle and slightly different angle, in combination with the stock and modified CB. The pinion from up to down and in between. I really do not know angles others people have been successful with. I am just really at wits end as to what to try, unless there is a special combination of angles I have not tried it looks like this project is dead in the water. Nothing changes the amount of vibration at 58-65 MPH. We have tried to make it worse and it stays the same. It is almost like I am on the wrong track. We shifted to neutral, gave it gas, let off the gas, shut off the engine while running 60, no change the vibration stays the same. I am running the drive shaft in phase but it did the same before we changed the phase. Maybe other things were wrong at the time it was in the "out of phase" situation.. Thanks for everything guys but if you got any mores ideas shoot them at me.
