Tools & Supplies
Grease Gun - pistol grip type is best
Flexible Hose for Grease Gun plus universal grease tip
Grease (see your owner's manual)
Rag soaked with grease penetrant
I am providing this write up for illustrative purposes only. Perform at your own risk. Any mods (including this one) you perform on your vehicle is your responsibility. Commercial use of this write up will result in legal action.
A note about
tools and grease type: If your 4runner requires two grease types, buy
two pistol grip (one-handed) grease guns. It will save you alot of time.
As for the grease type for a 98 4Runner, Toyota recommends two different
grease types for the driveshafts: for the u-joints, use NLGI #2 Lithium
Base Chassis Grease. For the slide yoke and double cardan joint, use NLGI
#2 Molybdenum Disulfide Lithium Based Chassis Grease (Note: I have read
that from 2000 to 2002, Toyota standardized the grease type to one kind).
So if you are not 100% sure, look in your owner's manual and follow it. Of course, you can substitute any type of compatible synthetic grease
as well (I'll switch to some type of Amsoil grease soon), but again, follow
the manufacturer's recommendation.
For the front driveshaft, there are a total of three zerks. To expose the zerk fittings, just simply turn the front driveshaft with your gloved hand. As you will see, the front zerk fitting can be found sticking out from the u-joint. This one is a bit tough to get to because of the sway bar. Take your oil penetrant-soaked rag and clean off the zerk fitting. Next, take your grease gun with the flexible tube with universal tip and snap it into the cleaned grease fitting. Of note, you may need to force it into it to fit. Once mated, pump your grease gun until you hear and see the grease coming out of the seals. It makes a very distinctive sound and you'll know when you hear it.
Next, move down to the other end of the driveshaft and rotate it until you can see the two other zerk fittings. One is on the u-joint and one is on the slip yoke itself. Again, clean off the fittings and then pump some grease into them. Of note, the slip yoke takes about 5 or 6 pumps of grease.
At the forward
end of the rear driveshaft, there are three zerk fittings. One of the
zerks is neatly hiding away behind the double-cardan joint. This is a
u-joint zerk, so use the appropriate grease. And to finish, grease the
two most visible zerks protruding out of the double cardan joint.