Driveline Vibrations

[TurboTJ]

Speaking of bump stop extensions, does anyone know just how far into the cup the jounce bumper will compress on a hard bump? We are told that when cycling the axle that you should go all the way without the bumper, metal to metal. But is that realistic? Will the jounce bumper actually compress entirely into the cup?

 

[JMT]

Speaking of bump stop extensions, does anyone know just how far into the cup the jounce bumper will compress on a hard bump? We are told that when cycling the axle that you should go all the way without the bumper, metal to metal. But is that realistic? Will the jounce bumper actually compress entirely into the cup?

Stock ones will. There are aftermarket ones that are a different material and provide some bumpstop I believe

 

[Westtown Willy]

It appears to me that the only way to get the pinion angle absolutely correct is to use larger bump stop extensions.

not sure I follow this, what does one have to do with the other?

 

[TurboTJ]

With longer bump stop extensions the pinion can be rotated further up before the track bar hits the gas tank skid. It is the flange of the skid that is the problem. It sticks farther forward than the body of the skid. Moving the track bar rearward by lengthening the top control arms causes the interference with that flange. Restricting the up travel prevents the track bar from getting as high as the flange.