Greasing rear differential u-joint - any tricks?

[57rookie]

My GM 12 bolt that is fit into my 57 Chevy has a tough to grease ujoint zerk. I can't find an attachment small enough for my grease gun to clear the yoke to get to the grease fitting. Anyone else have this issue and what or where can I find a greasing adapter that is small enough to get into the ujoint grease fitting?

[mr48chev]

A lot of guys use a "needle" adapter to get to those.Similar to this one that you can find at most auto parts houses Amazon.com: Lincoln Lubrication 5803 Grease... They do take two hands and them some to operate at times though.

Sometimes you can rotate the driveshaft a bit to make it easier to get to too.

[JumboAMONGus]

jack up the rearend up untill the pinon angle is where you can get the greae gun in there ,thats what i did ,or loosen the drive line a little but not where the caps are gonna come off