put in 8 3/4, now have vibration

Horror Freight, LOL I like that place! But anyways I didnt know anything about the pinion angle, do you know what the angle should be?

Here is a couple pics of front and rear ujoints: PS - who thnks the problem might be caused from my driveshaft a little too short?


Rear u joint doesn't really look assembled right, shouldn't that cap towards the bottom of the pic. be in more with a clip ?