Sometimes when coming to a stop I feel a bump as if someone hit me from behind. What is causing this and it is something I should worry about? 40K on the truck, just changed the spin-on filter. Seems to have increased after changing filter? hmmmmmm. Checked the fluid cold and it was 1 qt low. Filled but haven't checked hot yet.

Lube the driveshaft splines.

With??????

how would that help??