Given our temp extremes up here I stick with the Yota seal; just my personal pref.

Crank bolt--19mm socket, rest breaker bar on driver's side frame. Remove coil plug. BUMP, do not start engine--

Crank pulley should simply wiggle off. This is also a good time to swap out belts if yours are lookin' a bit ratty. <img src="/forums/images/graemlins/kewl.gif" alt="" />

The oil that comes out from behind the seal is minimal; have a rag handy.

Inspect pulley. If there are any grooves, then you need a speedy-sleeve (NAPA). Put some RTV or loctite on the pulley, gently tap sleeve back on; I use a block of wood on top of the sleeve for this part.

Use a seal puller or S.D to remove seal; be VERY careful not to gouge the oil pump body, or you'll be out some moola for a new one. <img src="/forums/images/graemlins/shame.gif" alt="" />

Lightly grease new seal and tap back in; a socket works well if you don't have a sealer. Make sure it's fully seated.

Reinstall. Put truck in highest gear and set ebrake. Torque crank pulley bolt to 116 ft-lbs. (rent the wrench)

Finish putting stuff back together, tighten belts etc. Check oil level and fire up to check for leaks.