Q: I cannot find a grease zerk on the u-joints on my truck. Do all u-joints have zerks?
A: No. Some original equipment u-joints are factory sealed and cannot be greased. If you are not having problems with them, then they are fine. Most aftermarket u-joints will have grease zerks. To reach some zerk fittings on u-joints a special needle adapter is needed on the end of the grease gun.