differential & transfer case oil & seals

[leety]

I have a 2001 3500 4x4 

 

what would the proper fluids and sealing materials for the transfer case and differentials?
 

 

[Stanley]

GL5 80-90 FOR AXLES, GOOD OLE ATF FOR THE T-CASE. 

[NIsaacs]

I would use 80w-90 for the front and if you tow, 85w-140 for the rear or if you prefer 75w-140 synthetic.  If you have limited slip in the rear you need to use additive or some oil has it included. T-case calls for ATF+4. Not sure what you mean by "sealing materials". If you mean the diff covers, a good quality RTV sealer works or if you want, Napa will have or can order the gaskets for them.

Edited September 9, 2020 by NIsaacs

[015point9]

My mag Tech with real good instructions

 

https://mag-hytec.com/installation/

 

 

 

 

 

 

[Mopar1973Man]

On 9/9/2020 at 1:27 PM, leety said:

I have a 2001 3500 4x4 

 

what would the proper fluids and sealing materials for the transfer case and differentials?
 

 

 

Limited slip 85w-140 GL-5 (Synthetic)

Open Diff 80w-90 GL-5 (Petroleum) 

 

Transfer Case ATF (Dextron) ATF+4 is not required!

 

Diff Covers just use Ultra Grey RTV silicone.

 

Like my truck is open diff front and rear. Even with a limited slip rear you would use the 85W-140 in the rear and then in the front use 80w-90 since there is no limited slip front axles.

Edited September 11, 2020 by Mopar1973Man

[leety]

6 hours ago, Mopar1973Man said:

Thank you!!

According to this spec sheet:

https://www.vindecoderz.com/EN/check-lookup/1B7MF33791J565630

I have these front and rear axels

Dana M60/248MM Front Axle

Dana M80 Rear Axle

 

How can I know if they are limited slip or Open diff?

6 hours ago, Mopar1973Man said:

Limited slip 85w-140 GL-5 (Synthetic)

Open Diff 80w-90 GL-5 (Petroleum) 

 

Transfer Case ATF (Dextron) ATF+4 is not required!

 

Diff Covers just use Ultra Grey RTV silicone.

 

Like my truck is open diff front and rear. Even with a limited slip rear you would use the 85W-140 in the rear and then in the front use 80w-90 since there is no limited slip front axles.

 

[Joe_Pool]

I use Lube Locker self sealing gaskets -- no sealer required and they are reusable (tend to check on a regular basis).

[dripley]

3 hours ago, leety said:

According to this spec sheet:

https://www.vindecoderz.com/EN/check-lookup/1B7MF33791J565630

I have these front and rear axels

Dana M60/248MM Front Axle

Dana M80 Rear Axle

 

How can I know if they are limited slip or Open diff?

 

Look on your glove box door. If it is still readable it should say there. Another way is to jack up the rear end and spin one of the tires. If the other side turns the same way it is LS. If they spin opposite direction it is open.

[IBMobile]

Get the vehicle ID number and go to a Dodge dealer parts or service department; see if they will print the factory build sheet for it. 

[NIsaacs]

14 hours ago, leety said:

 

How can I know if they are limited slip or Open diff?

 

 

Just get the oil that includes the fiction modifier, it will work fine in a non limited slip too. That way you are covered. 

 

 

 

 

[Mopar1973Man]

On 9/12/2020 at 4:08 AM, NIsaacs said:

it will work fine in a non limited slip too.

 

I don't suggest it.

 

85W-140 can be too thick for the axle and seen cases where the gear lube was so slow to fill the bearings that cause bearing failure twice for guy down in Texas with 110*F temp. We tested the thought it took over 1 hour for the oil to start dripping out the tube after being slightly lifted on one side. He was told do not pack the bearings with grease. I told him to pack the bearings on both axles so the bearings are lubed till that thick gear lube makes it to the ends. It takes time to get the gear lube up to temps and flow to the bearings... He was using a synthetic no less as well just super thick...

 

Even after I change the gear lube I go out for drive to a big turn out by my place and do figure eights to push oil into tubes down to the bearing and re-check the level. Typically on limited slip axles you can add a bit more because of it thick natural and resistance to flow down the tubes. 

 

140 weight is some seriously thick lube thicker than 60 weight engine oil. Where 80w-90 is more like 20w-50 engine oil thins down nicely and flows super good to the hub bearings.

 

Limited slip requires it from the amount of heat the clutch pack produces as you drive city street and corner a bunch. The friction modifier is needed to make the lube slick enough to prevent chattering of the clutch pack. Hence why only the REAR AXLE with limit slip requires this thick lube. Open diffs should stay to the 80w-90 lube to reduce excessive drag and has better flow characteristics.  

 

 

Edited September 13, 2020 by Mopar1973Man

[NIsaacs]

On 9/13/2020 at 6:14 AM, Mopar1973Man said:

 

I don't suggest it.

 

You don't suggest what?

 

The OP asked how to tell if the truck had limited slip or open diff. The question was in reference to friction modifier or not. My response was just get oil with the modifier included, it will be fine for either axle. Most quality oil already has it included.

 

All my oil recommendations for this thread are right out of my '01 operators manual.

[Mopar1973Man]

Don't suggest filling an open diff with (front) with 85w-140. You could but don't suggest that...

 

Best off using the 80w-90. Open the cover and look. Simply to look and just see what you got.

 

Open... Gear visiable in the middle.

 

Limited slip... Clutch packs cover most of the carrier gears.