Random questions, replace all wheel seals or just the one that blew?

I’d wait till it’s brake shoe time. I have 2 wheel seals on my drive axles with over 2 million miles. Check the bearings good for loose cages, Might want to check end play on the others. Too much is a common cause of seal failure. Otherwise just crawl under on occasion if you’re worried about the others. With a flashlight, you can look for any seepage, catching one before it blows.

 

Batteries always, ALWAYS get replaced as a group.

Wheel seals replace as needed.

 

You're supposed to replace the batteries?

 

Lol

 

I wouldn’t do wheel seals proactively. Those others could go a long time. They will develop a slow seepage usually and give plenty of notice to somebody even paying halfway attention. Personally I don’t like any trailer or truck steer hub where I can’t easily see the oil level every AM on a quick walk around.

 

Is it totally blown? Like dripping out and making a mess? If not, I would leave it be and keep an eye on it. Sometimes they never start leaking out even when they're wet and they'll dry back out. Even if it is leaking I would just do the ones that are leaking instead of all of them. The only time I would do all four would be if I was already doing brakes anyway. It's not much more to do the seal from that point.

 

Just replacing a a non leaking seal as a PM item may only cause a problem
You can always get a bad part or install and then be back to square one