I have finally gotten my 72 K/5 on (and off) the road, and just two weeks after starting to drive it, the pinion gear came loose, and fell into my rear differential. It had completely destryoyed my ring and pinion gears, and I was forced to make an emergency replacement of the diff with one from a 69 pickup to get the Blazer home. My main problem is, the ratio is different. The Blazer HAD 3.73 in it originally, and the diff that i put in is somewhere near 4.11. My question is, is this going to damage my driveline and/or transfer case? Will it help if i remove the front driveshaft untill i can balance out the gears(put the 3.73 back in)? Also, it has started to get a strong vibration underneath the truck at around 20-25 mph now that wasnt there before. Any suggestions?