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Gear Oil for rear End

What type of iol to use for rear-end

Gear Oil for rear End

Postby OOfatso [OP] » Aug 20 2013, 7:47am

I am gonna replace the transfluid and i want to do the rear-end gear lube also....any recomendations.....2500HD Duramax/Allison
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Re: Gear Oil for rear End

Postby EKinMN » Aug 20 2013, 12:10pm

Do a quick search and you will find that most here will recommend Amsoil Severe Gear 75w90. It's what I run.

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Re: Gear Oil for rear End

Postby OOfatso [OP] » Aug 21 2013, 4:28am

How do I get all of the old gear oil out??? what is the easiest way?
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Re: Gear Oil for rear End

Postby j8manski » Aug 21 2013, 4:40am

There is a bolt on the very bottom of the rear end facing the ground. It is flush with the case and you can use a 1/2 inch ratchet to remove it to drain all the fluid. That is if you don't want to get messy and take the cover off. The only problem with this is that you can't clean the magnet of debris, but will allow you to drain all fluid and replace with all new fluid. It maybe a 3/8 ratchet.... but you get the idea, its a squear socket
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Re: Gear Oil for rear End

Postby Tavo91 » Aug 21 2013, 4:42am

Go to your auto parts store and oil up a diff cover gasket and remove the over and let it all come out and scoop all the left over out with your finger or rag and bolt the cover back on and make sure all bolts are tightened in a star pattern and correct torque is applied and fill her back up till she starts dripping out of the fill hole


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Re: Gear Oil for rear End

Postby OOfatso [OP] » Aug 21 2013, 5:12am

I guess if i go that route (Pulling The Cover) maybe i should just go ahead and change the cover to an aftermaket like the Hytect trans cover i just bought....I know dumb questions but i really need this truck to last awhile longer........I cant afford to have a stupid mistake take out a rear-end or trans.....Finacially it would.....oh well you get the picture....thanks for the help! All suggestions are being taken serously!
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Re: Gear Oil for rear End

Postby dan58 » Aug 21 2013, 12:35pm

I'd run a heavier gear lube than that water. 75W/140. Use Right Stuff RTV instead of that gasket (or, you can also look into Lube Locker, which are great).
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Re: Gear Oil for rear End

Postby Z15 » Aug 21 2013, 12:51pm

Thicker gear lube makes the differential run hotter because it causes more friction.
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Re: Gear Oil for rear End

Postby dan58 » Aug 21 2013, 1:05pm

Z15 wrote:Thicker gear lube makes the differential run hotter because it causes more friction.


And thick gear lube also protects the gears a lot better than thin stuff. Why are racers now switching to 250W? Gear protection.
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Re: Gear Oil for rear End

Postby Z15 » Aug 21 2013, 2:02pm

Rock crawling and racing differential gears are subjected to extreme torque from the combination of transmission, transfer case and differential gear reductions. This torque can be many times more torque than normal automotive applications.

Besides thicker viscosity, 190 and 250 gear lubes are fortified for shock loading of heavily loaded gear sets and designed with anti-sling off to stay on the gears during high speed acceleration G-forces.
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