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Check to make sure that the vent is operational, and not clogged. I had this happen to a Dana 60 once, and it drove me nuts why it would keep blowing seals.

I used this Mopar NOS SEAL KIT Speedometer Gear Pinion Adapter Plymouth Dodge Chrysler 66-75 | eBay

If you are experiencing a vibration, and you found the u-joint grease fitting is missing, it would be best to remove the driveshaft and check both u-joints for binding during movement before installing a new grease fitting. I have seen plenty of them show no signs of in/out, up/dn play, yet...

Here is both of the seals in one convenient package Mopar NOS SEALS for Speedometer Gear Pinion Adapter A833 A727 A904 340 440 Hemi | eBay

While holding the screw, tighten down the nut with a wrench so it's snugged up, then torque nut to specs as adjustment screw movement would be very minimal.

Damn you tool man Mike!!!!!

Someone put up a great picture reference to doing this, just do a site search here you go http://www.forabodiesonly.com/mopar/posts/1971021374/

Just make sure that the speedometer pinion housing is clocked properly in the tailshaft for the corresponding gear number that is installed.

Don't forget that they sell the sticker overlays to cover them too.

Trailbeast is correct.it would just be like putting a band aid on a gunshot wound. There shouldn't be trans fluid in your speedometer cable . I posted a link in my previous post!

Zigs is on the right track. Order one of these first http://www.ebay.com/itm/Mopar-NOS-SEALS-for-Speedometer-Gear-Pinion-Adapter-A833-A727-A904-340-440-Hemi-/321996433442?hash=item4af87ba822:g:lIcAAOxyzi9Sjucl Before removing the speedometer pinion housing you need to clean it off, take...

^^^ what he said !!! That's where I would start. Sounds like driveshaft related.