Gear Oil Weight.....

[sweetwaterbroncoII]

I'm repairing my leaky rear-end today.....anyone know what weight gear oil to use?

 

[Wicked_Sludge]

gear oil weight.

seriously, its a gearset. as long as it says "gear oil" on the bottle, the weight doesnt matter that much. gear oil weight isnt nearly as crucial as engine oil weight.

 

[Hibs]

75-90

 

[UrbanRedneckKid]

Use 1 qt of Lukas Oil, then top it off with regular 75w90.

 

[Hibs]

i second that. lucas kicks ass.

 

[sweetwaterbroncoII]

Thanks for the help....I'm just a novice mechanic trying to learn all I can...

 

[Hibs]

what is leaky on it? if you take the diff cover off, make sure to clean it real whell with a wire brush/wheel, then brake clean, and then use a nice bead of black silicone on it.

 

[MAKG]

what is leaky on it? if you take the diff cover off, make sure to clean it real whell with a wire brush/wheel, then brake clean, and then use a nice bead of black silicone on it.

And you'll never remove it again....

You can use a TINY bit of black silicone, but a $5 gasket really is a whole lot better. You can get it at the dealer or a rear end shop, if your auto parts store doesn't cooperate.

Use the lightest GL-5 gear oil you can get your hands on.

 

[Hibs]

never remove it again? it's silicone, not JB weld.

Seriously, i've done about 30-40 rearends, used silicone every time. AND removed it later on. It's the best way to seal it. Those gaskets suck, usually end up leaking.

 

[sweetwaterbroncoII]

Its leaking around the bottom bolts....I've only had this BII for around a month or so....will RTv work?

 

[Wicked_Sludge]

ive never seen or heard of a gasket for a 7.5 or 8.8 rear. i worked at a ford dealer for over a year and we always used RTV.

 

[sweetwaterbroncoII]

I haven't heard of one either...I'll go buy a tube of RTV....thanks...

 

[MAKG]

ive never seen or heard of a gasket for a 7.5 or 8.8 rear. i worked at a ford dealer for over a year and we always used RTV.

I've put gaskets on both. They exist. I even found a nice reusable one for the 8.8 (but it is rather pricey).

Black RTV is a LOT worse on 8.8s, where you'll crack the plastic cover trying to get that SOB off. The 7.5s will bend up, but you can flatten them. Yes, that's experience.

As for using it at the dealer, they do go on that way, and they don't leak. But YOU don't have to take it off next time.

If you MUST use RTV, use it (very) sparingly. A big fat bead might not BE JB Weld, but it's awfully close....

There are also less-hard silicones out there that might be a bit more appropriate than the black stuff.

 

[BlackBII]

I've bought gaskets for 7.5 and 8.8 at checker/autozone. Like 10$

 

[mjonesjr]

Gaskets are easy to find for the 7.5 and 8.8. All the major auto parts stores carry them for around $10.

I bet your dealership charged for one Wicked and made you use RTV.

 

[sweetwaterbroncoII]

i found a gasket for 5.99...I'll go that route....

 

[Wicked_Sludge]

I bet your dealership charged for one Wicked and made you use RTV.

its possible...in fact it wouldnt surprise me. our service writers were morons.

for the record...i wasnt saying those gaskets didnt exists. i was just pointing out that me and thousands of mechanics around the country always use RTV and have never had a problem :icon_thumby:

 

[Hibs]

for the record...i wasnt saying those gaskets didnt exists. i was just pointing out that me and thousands of mechanics around the country always use RTV and have never had a problem :icon_thumby:

 

[thegoat4]

RTV is easy to get loose with a putty knife. With a little hammer, just tap the knife into the seam, then tap it sideways around the housing. I have a sharpening stone I use to sharpen the edges of my knife and touch it up after each use. Sails right through gaskets, RTV, paint, etc.

If you have leaks around bolt threads, you can use anaerobic sealant on the threads. It works very well in that application. Also, if you have a gasket that's prone to leaking, it makes a good gasket shellack that isn't a nightmare to chisel off later.

 

[sweetwaterbroncoII]

Well I just now got around to repairing it, but I have ran into a problem....the fill bolt that you remove to put the gear oil in is stripped, and I can't remove it....I guess the previous owner had tried to repair it ince before.....now what do I need to do to get the bolt out?