Oh, and Toxic the expert in so many areas...didn't note that the grease coming out of the slip joint is in line with the zerk. So most of the grease you put through the zerk came out of the splines
right at the zerk.
There is just a tad bit of slop in the spline fit. So if you can, put a pump of grease with the zerk at top, 3 o'clock, 6 o'clock and 9 o'clock and that will get grease into more of the splines.
But just one pump of the grease gun is more that enough. If the splined connection is good and tight, No radial slop? then the next paragraph is the way to go.
Now, none of the other spline connections on the machine have grease zerks, axles, front diff. For my CCI Driveline shafts the carrier bearing doesn't have one. Back at the trans, where the
joint you tried to grease is located...probably what Polaris was after was to keep water and debris out of the slip joint. So if you don't have one, get a "needle tip" for your grease gun and just
pump a little grease into the splines at the the end of the driveshaft with the needle tip in the splines on the output shaft. a little time consuming, but a good way to seal the connecting point
and keep it as sealed as you can.
In fact, my CCI Driveline shaft install instructions tell one to put RTV on the splines of the front diff input shaft, pinion shaft. Then put the forward drive shaft over the input shaft and the RTV
will keep water out of the connection. This one is not a slip joint.
Just thoughts,
Pirate