Hello,
Yesterday I installed the toyotec ultimate 3inch lift. I also replaced both cv axles with remanufactured units from Napa. I checked the seals on the front differential and they appeared fine, so I didn't replace them. Today I found diff oil in the driveway. I looked under the vehicle and it was all over on the right side. In light of the problem, I replaced the right axle seal. I checked the end of cv and it was smooth with no burs. I didn't touch the seal with any sharp edge. Wiped up all oil and drove it around. I parked in a different spot and saw oil on the ground and it's got a drip coming from the seal. I don't know what else I should do. Please help!!

Any takers?

New seal(s)??? How old, how many miles?

That's a bummer, for sure. How did you install the seals? I wonder if your right seal may have been damaged during istall? I recently had a bad left seal and decided to just replace the cv half shaft while doing the seal (NAPA half shaft). No problems at all. Hope you get it figured out easily enough. It's a lot of work, but if you are confident in the cv part, you might want to just try reinstalling the seal on the differential. Be Very careful and use some assistance - I used a 2 1/2" (IIRC) exhaust connector from the Zone ($2.38 or so) to help tap the new seal in evenly.
GOOD LUCK!

I got another cv axle from Napa and installed it. when I took out the old one I saw that my new hub gasket was slightly eaten up on section of it and the spring was out on that side. Another trip to my local stealer and 25 dollars later I had a new one. I installed the new axle and drove it around and didn't see any oil. I drove it around again and didn't see any oil. I cleaned up and went to the grocery store and checked it and saw a drop hanging from the outer axle. On the pan under it I saw a little bit. I am going to give it a little bit longer to see what it's going to do before I fire my AR15 into the side of it and light it on fire. It's not leaking nearly what it was before. Woo Hoo!

I kept the original seals on the outer ends of the differential. I was carefull and inspected the seals. Only the right side leaked. After seeing the leak, I replaced the perfectly good seal with a new Toyota seal. I drove it in with a motorcycle oil filter wrench that fit perfectly on it. I had assistance holding the shaft and guiding it in. The splines never touched the seal. I appreciate you guys asking these questions.

Did you fit the seals over the shafts to see how they fit first before installing them? Try putting some grease on the shaft so the shaft won't be dry when first turning when driving.

I did. The old seal felt okay. The new seal was really tight. I put a thin coat of grease on the shaft before the install. It doesn't leak when it sits, just going down the road.

It may be a case where the seal needs to be driven allowing it to "seat in" to seal and/or it will eventually swell helping it seal. If I remember correctly, I've seen a few GMs like this.

I was also wondering about that. Does anyone know if this is true? My thought on it was if that was the case you would see new cars leaking on the lot after a test drive.

Uh...I don't think seals need to "seat in". If a new seal on a new cvj leaks it is usually because of a tolerance issue. Wrong seal or cheapo aftermarket part.

Yesterday I wiped up all the leaks and drove it around one more time. I said that if it leaked then it would go to the dealer. Well, it didn't leak. My wife drove it around today and it didn't leak a drop. I am keeping a close eye on it. I took out the differential fill plug and it was slowly oozing out. Still full. My fingers are crossed.

clean the area with brake parts cleaner to be sure you aren't mistaking"old" fluid as a leak

It's been about a week now after I replaced the CV axle. The seal is still leaking. It's just about 1 drop hanging from the axle tube on the right side. I wipe it off every time I see one. I was given the idea to wait and see if it stops because I was told that if you use grease a little grease on the seal and axle durring assembly, you might change the surface friction. By giving it a little time it will hopefully "wash" away the grease. My gut feeling from the begining is that it will need to be replaced. To recap: after replacing both cv axles, the right one leaked. I replaced the seal on that side and it still leaked. I then replaced it with another cv axle and it still leaks. It only leaks when you drive it. The new seal was tight. The cv was smooth where the axle seal rides. I am going to give it another week then I'll replace the seal and change fluid. This is getting expensive.

@jaxbusa I realize this thread is 5 years old but if you are still out there how did this play out? I'm in the exact same boat as you were.