My 94 1/2 ton has a greaseable u-joint on the back end of the driveshaft. It was put in when I had the trans rebuilt last summer - by the shop, without prior notice. Is there any way to grease this without dropping the driveshaft? Is there a smaller grease gun tip available that still fits a standard zerk? There's no way a regular grease gun tip will fit without taking the shaft out of the pinion yoke.