Axially adjustable driveshaft assembly

An axially adjustable driveshaft assembly in a drive train system comprising:

• a first driveshaft section being hollow therethrough and having either a female or a male splined end, and a first driveshaft section end fitting;
• a second driveshaft section engaged with the first driveshaft section for relative axial movement, being hollow therethrough, and having the other of the female or male splined end and a second driveshaft section end fitting;
• a valve disposed in an aperture formed through one of the driveshaft sections wherein the driveshaft section having the female splined end being about the driveshaft section having the male splined end section to define a sealed internal chamber therein, and the valve in fluid communication with the sealed internal chamber such that the valve prevents ambient air from passing into or out of the sealed internal chamber;
• and
• a pressurized air or vacuum source with an off position to selectively pressurize or evacuate the sealed internal chamber to allow the relative axial movement between the first and second driveshaft sections so as to facilitate installation of the axially adjustable driveshaft assembly to the drive train system;
• wherein the axially adjustable driveshaft assembly is connected between a driving output shaft and a non-coaxially aligned driven input shaft, with the pressurize air or vacuum source in the off position.