I need to replace my center support beadring on my 2 piece driveshaft. The new one comes with a 35mm or a 40 mm diameter. Without pulling off my driveshaft whow do I tell the difference?

 

You can strap the shaft; 125mm circum = 40mm and 109mm circum = 35mm. You could also just mic the shaft diameter.

 

ok I tried the mic method but could not get it in the right spot.

I found out that the 40mm is for a coupling type drive shaft and a 35mm is for the slip yoke style. I am 99% sure mine is the slip yoke style at that location .