So I took the Jeep out for work one day instead of driving the company truck. I drove it to one of my dealers about 25 miles away, held my meeting and showed off the Jeep to the dealer principal and technicians. I noticed a small puddle of gear oil under the skid plate when I stopped that appeared to be coming from the rear output shaft seal.
I left that dealer and drove it about 15 miles to another one to hold another meeting and show the CJ to the Parts & Service Director who is a big Jeep and Cobra fan. He used to mud race a CJ5 back in the day and also had a couple different Cobras. While I was there I put the Jeep on the alignment rack just so I would know where I was at.
I figured everything was going to be pretty close because of how well it drives and tracks on the highway. So I was actually surprised to find out I only have .8* of caster. The alignment machine lists 76-80 CJ caster spec at 2-4*. So it looks like I'll be adding a few degrees of caster to my front axle sometime soon.
While it was on the alignment rack I noticed another fairly large puddle of gear oil under the cross member and it was obvious it was coming out of the rear output shaft this time. I'm thinking, this sucks that seal and yoke are brand new.
So I drove it home and cleaned up all the oil, removed the driveshaft then pulled off the yoke. I put my finger up to the seal to see if I could feel any cuts or rough spots on the seal lip. As soon as I touched the seal, the entire thing moved back about 1/8" in the housing. I'm thinking, that shouldn't happen that seal is pressed fit and obviously shouldn't move. So it wasn't leaking between the seal and the yoke, it was leaking between the seal and the housing.
I went to NAPA and asked for the seal expecting it to be a $3 part, $1.99 at Moris4x4, and nearly choked when she told me it was $23. Once I compared the Napa SKF seal to the leaking Omix seal, I gladly paid the extra amount. It was obvious how the metal portion of the Omix seal was very thin and flimsy metal which allowed it to easily distort in the housing. The metal portion of the SKF seal was much stronger, it had green sealing paint around the outside edge and the rubber sealing surface had a smaller diameter which makes it seal to the yoke tighter. Now I'm wondering about my front seal and how long it's going to last. I got the new seal installed and the driveshaft put back on. I drove it another 30 miles or so and all is dry. I'm confident this one won't leak.
After the trip to the dealerships, I determined I drove 77 miles overall after correcting for my 2 mph speedo discrepancy. I had filled up right before I left and then again at the same pump when I got back. I figured my average speed was right around 60mph judging the time spent on state highways, interstate highway and around the small towns. It took 5.0 gallons to travel 77 miles which comes to 15.4 mpg. Not too bad if you ask me.