74delta
Member
Ok guy need your help as I am out of my element when it comes to differentials. I picked up a fresh rebuilt 489 case with a cone style suregrip to replace my open 742 case, Both 3.23 gears in my 65 300. The guy who sold it to me was a hard-core mopar enthusiast with lots of nice parts/cars. The swap went super easy. Unfortunately I have a real bad howl when coasting. My question is could this be caused by the axel adjustment on the passenger side. I did not mess with that at all and just put it where it was previously. Ill attach a picture that shows the paint markings on the gears but from my research they looked good so I'm hoping its not a pinion preload issue and its just me being stupid and assuming that adjustment on the axel would have been the same. I only drove the car about 1/2 a mile since the install.