Hey guys I am having some trouble with my 2004 4runner front differential.
I just replaced the CV axels on both sides and after driving it for about 100 miles there seems to be differential fluid leaking on the passenger side from where the CV enters the front differential. Any one have any Ideas on how I should go about fixing it? I am assuming that it is being caused by a broken seal inside the differential where the shaft is inserted but I am no expert so some help would be much appreciated!

Your probably right. There is an axle seal that the CV shaft goes through. It's not hard to replace and it's generally recommended that it be replaced if you replace the CV shaft because it often gets damaged and leaks shortly afterwards... like you are finding out.

You have to pull the CV shaft back out, pull out the old seal, install the new seal, then put everything back together. It's not hard, but it takes the same amount of labor to do it than the CV axle which is why it's usually done at the same time.

My only recommendation is to use an OEM seal. They're only about $10 and I've found that they fit much better than aftermarket.

Did you replace the CV shafts yourself or did a shop do it?

Indeed I think you are correct. The seal on the differential likely needs to be replaced. They are about 15 bucks a piece and are different on each side. Toyota part numbers: 41311b for RH and LH (which are different part numbers)

Thanks man! I did the CV shafts myself, where should I get the OEM seal? Should I try a dealership or is there a website or shop that would sell them?

For something as cheap as a seal I'd just go to the dealership. It's not worth waiting and shipping. If it were a more expensive part I'd look online.

You can use a 2" PVC coupler (like you would use to connect 2 pieces of 2" PVC pipe) to drive the seal into place. It fits perfectly.

How am I supposed to remove the seal I can't seem to get it free? Any ideas?

Dig it out with a screwdriver? Since you are replacing it it shouldn't matter?

You might have to run to the autoparts store and get one of those bent need nose pliers?

Here you go. I see why you go stuck. Would not have thought this.
https://youtu.be/H97Vh6woJ68

I always use the claw end of a standard carpenter's hammer for better leverage. Just be sure to tape up the end of the hammer so that you don't scratch up the inside of your differential housing.

To pull old seal out get yourself a seal remover (is that a proper word?) it looks like screwdriver but has pointed hook at the end. Works great to get stubborn seals out. Make sure you get yourself new OEM seal and then install it on the shaft and carefully slide the CV shaft back in place. You can see below what I mean.



When I was replacing my CV axles, after first time my seal was leaking due to the fact that I must have not installed it properly. I used socket to set it in place and probably drove it too far or bent it somewhere. You need to be really careful how far you push it in and not damage it at the same time. Simply lube your new seal, slide it on the axle until it sits against dust shield and carefully!! install the axle back. It worked for me!

Almost 5 years old but dang never thought about sliding the seal over my axle and putting it in 🤔