H3 Diff and TCase oil Change

[IndyHummers]

Yup, and then the next morning the H3 didn't start lol.

 

[alrock]

Seriously? Well, we know it isn't your fluid change. Heck, I ran about 100 miles on a t-case with no oil.

 

[Burn]

Know this is an old thread but was reading it for information, anyhow just did my TC and would like to add this. There is an O-Ring on the speed sensor that did not come off with it. Only knew it was there when it fell off. Please make sure you know where it is, kinda like the oil filter ring sometimes sticks. Anyhow good luck.

 

[Chocflip201]

I just bought a new heavy duty diff cover but the fill plug is at the very top of the cover instead of the "correct fill height" of the OEM cover. This makes it so I can't know exactly how much I need to put in. Think I'll be fine with just putting in 2 liters after I drain all the old fluid out when I pull off the old diff cover?

 

[persius1]

The capacity for the rear is 2.5 quarts. I just changed mine a few weeks ago


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[Chocflip201]

The capacity for the rear is 2.5 quarts. I just changed mine a few weeks ago 


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I was going off the service manual. 2 liters/2.11 quarts.

Another thing for me to consider is the new cover (above) looks like it is deeper and would need more fluid than the OEM.

 

[alrock]

That's going to be a bit awkward to get to the right fill height.

 

[Chocflip201]

I decided I'm going to make another fill-plug bung and put another fill hole at the proper height.

 

[MaxPF]

Rotate the cover to make the existing "fill" port a drain port, then put the new fill port at the proper level.

 

[Chocflip201]

Rotate the cover to make the existing "fill" port a drain port, then put the new fill port at the proper level.

I don't want that existing port at the bottom. If I ever need to drain the axle oil, I want to inspect the gears and everything too, so I will just pull the cover. A plug at the bottom is just a plug that can fall out and drain my oil and blow up my rear diff to me.

 

[alrock]

You have a drain on the diff anyway in the event you choose not to pull the cover.

 

[Chocflip201]

You have a drain on the diff anyway in the event you choose not to pull the cover.

Yeah I saw that on the bottom. I am just the kind of person that if for whatever reason I need to drain the oil, it would be a good time to inspect the gears too. And I probably won't ever mess with that drain on the bottom of the case because my luck it would come loose and fall out after. I spent most of the day working on my new fill plug bung.

 

[MaxPF]

You have a drain on the diff anyway in the event you choose not to pull the cover.

Interesting. My AAM 14b has a drain plug, but for some reason I didn't think the 10b axles did. When GM still owned the axle division none of their axles had drain plugs. That's why I suggested he flip the cover.

Yeah I saw that on the bottom. I am just the kind of person that if for whatever reason I need to drain the oil, it would be a good time to inspect the gears too.

The typical reason for draining the diff lube is to change it at the service interval. Hence the drain plug.

And I probably won't ever mess with that drain on the bottom of the case because my luck it would come loose and fall out after. I spent most of the day working on my new fill plug bung.

Do you worry about your engine oil drain plug falling out?

 

[Chocflip201]

The typical reason for draining the diff lube is to change it at the service interval. Hence the drain plug.

Right, but also, having no oil in the axle, wouldn't it be a great time to pull the cover and visually inspect the differential? Especially on my vehicle whereas I wheel it offroad, not just on-road driving.

Do you worry about your engine oil drain plug falling out?

I don't have a gauge on my dash to tell me when I don't have oil in my rear axle and to immediately stop driving...

and fwiw my brother's plug fell out 40 mi. after an oil change from Jiffy Lube. Just saying it can happen.

 

[MaxPF]

Right, but also, having no oil in the axle, wouldn't it be a great time to pull the cover and visually inspect the differential? Especially on my vehicle whereas I wheel it offroad, not just on-road driving.

If you feel the need. The only thing a quick visual will tell you is if a gear is broken, which you would hear anyway. Checking bearings requires measurements, while checking E-Locker pins requires pulling the axle shafts.

I don't have a gauge on my dash to tell me when I don't have oil in my rear axle and to immediately stop driving...

and fwiw my brother's plug fell out 40 mi. after an oil change from Jiffy Lube. Just saying it can happen.

That's why I don't let Jiffy Lube, or any other lube shop, change my oil. The only way a drain plug falls out is if you "finger tighten" it and forget to snug it up with a wrench. So, don't forget.