Driveshaft linerity is an issue with the 140 chassis. There are driveshaft alignment diagrams and measurements in the "Popular Mechanics" CD-R. The info is supplied by Alldata. I got mine at PEP BOYS for about $29.99. It is internet interactive. You have to be on line to access the information. You can also download the info at www.alldata.com. for the same price. I prefer the CD-R from the auto parts store. Don't replace your driveshaft.