Rear Differential

[The Baron]

Hey just figured out that the fluid in my rear differential is leaking. I've been reading posts and the manual for about an hour now. People keep saying different things. Some say that the oil needs to be 80/90 others say it needs to be 90/75. Also some say I need to add the posi addictive in the rear and others don't. If someone could clear this up I'd appreciate it.

 

[Cucvnut]

First off what cucv do you have? You can run 80/90 in the diffs

 

[cliffyp]

LO 9-2320-289-12 Lubrication Order calls for 80/90 in temperatures above 32F. It calls for additive in the front difs of the 1028's and 1031.

 

[mikev]

First off what cucv do you have? You can run 80/90 in the diffs

Good opening question Cucvnut...

Guys, if you're going to ask for help, you really need to state year and MV type like M1008, M1009, M-35A1, etc in your post.

We're not "mind readers"...

People need to pull their heads out of their duffle bags and "think" before posting.

Geez, I see this all the time on other vehicle forums, eBay, Craigslist, etc...

Ok, rant off...

 

[The Baron]

I have an 84' M1009. Wait so if I drive in temperatures below 32F I need a different fluid?

 

[cliffyp]

It calls for the same weight in the categories of above 32 and +40 to -10. The weight changes if you are exclusively below zero.

 

[Blue2actual]

unless you live in a climate under 0 degrees year round, you just use 80/90 with no additive. If you have a droid or iphone you can put the TM's and lube order on your phone and take them with you wherever you go. Having the TM's in my pocket has saved my ass many times!

 

[The Baron]

Thanks guys

 

[donalloy1]

LO 9-2320-289-12 Lubrication Order calls for 80/90 in temperatures above 32F. It calls for additive in the front difs of the 1028's and 1031.

The 80/90 Lube Order has had me baffled since day one! Where do we purchase it? I have yet to find 80/90 Gear Oil on shelf anywhere. Please help! DMLII sends...

 

[197thhhc]

The 80/90 Lube Order has had me baffled since day one! Where do we purchase it? I have yet to find 80/90 Gear Oil on shelf anywhere. Please help! DMLII sends...

Look for 80w90 gear oil. All auto parts stores have it its usually near the regular oils. You will see it mostly in 1 quart squeeze bottles

 

[Blue2actual]

^^^^^^ likewise. I've never had a problem locating it. Pretty much ANY auto parts stores will have it.

 

[donalloy1]

Look for 80w90 gear oil. All auto parts stores have it its usually near the regular oils. You will see it mostly in 1 quart squeeze bottles

Time to dump the diffs! Been scared to do so because I thought the fluid was some special mil-spec blend. Thanks for squaring me away. DMLII sends....

 

[Cucvnut]

It smells great also! Mmmm used diff fluid.....

 

[donalloy1]

I prefer Axle Grease. Used diff oil works also Cucvnut

 

[Blue2actual]

I like burnt G.O. Great aroma!

 

[ODdave]

The grape scented stuff is kinna cool.

 

[jamesw0352]

where is it leaking? the plugs have crush washers on them made of copper, which is a soft metal. if it is leaking around the plugs, the you might want to look into replacing them. as for oil, 80/90. i put shaeffers synthetic 80/90 in my M35A3.