Which rear end oil for towing?

[claymike]

It's time to change the rear end oil, I want to go with a synthetic oil but do not know which brand to go with.

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Mike Clay
2001 HO,6 speed QC,2500,4x4Dark Garnet Red,ISSPRO E&B gauges on A Pillar, Rhino Nerf Steps Lit, Series 3000 brush & grill guard, NW Custom rocker panels, Jacobs E-brake, all options except leather, Reese 20k hitch. Towing a 30' Gulf Stream Sea Hawk 5th Wheel triple slide. The Mule

 

[Oil Man]

If you have decided on using a synthetic gear oil the one that I would recommend is made by Lubrication Engineers (LE) called synolec 9920. It is the only oil that has MONOLEC in it. MONOLEC has been proven to reduce wear by 24. 2% in radioactive wear tests. So even if another company used the same highest quality base oil and additive package as the 9920 uses they still don't have MONOLEC. If you wish to know more about the LE 9920 75w-140 synthetic oil with MONOLEC, then call Mag-Hytec at 1-818-786-8325 or e-mail me for more info.

Sincerely, Kevin

 

[Bob V]

Mike,
Go with the 9920. You may never have a radioactive rear-end but it will be nice to know that you are protected! #ad

Bob V. and Princess

 

[JJW_ND]

I have had good luck and very good samples come back with Amsoil Series 2000 75W90.

jjw
ND

 

[Shleets]

Go with the LE 9920.

 

[John Berger]

The Amsoil 2000 Series 75W90 gets the job done for me.


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1999 Dodge Ram 3500 Quad Cab 5 spd; 4:10 LSD rear; Mag-Hytec diff. cover; US Gear EGT and Boost gauges.
Cummins Whup Ass, don't leave home without it

 

[ghillie]

Definitely Amsoil, then several other synthetics over L. E. , or other petroleum based lubes.

Cheers


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Reformed Powerjoke owner, 2000 model, 3500, SLT, Quad-cab, 5 speed, 4. 10, 4X4, straight piped.

N7PXH

NRA member

 

[lawdog]

Just a silly question, but I am planning on getting the Amsoil for the axles, but does it need any friction modifier for limited slip rear... ... .

 

[Cooker]

Oil Man,

I really would like to go with the LE 9920, but the cost is up there.

Will is last longer? Or a better way to ask is, under the exact some operating conditions will it outlast (provide excellent protection) other MFG's 75w140. And lets not use Amsoil as an example. How about Mobil's Mobilube or Valvoline's HD 75w140.

 

[Oil Man]

Cooker,
Not only will I not compare the LE gear oil to Amsoil gear oil, but I will not compare it to any other gear oil by name. I will say that all the testing that I have ever seen shows that the LE gear oil will handle much more load and have less wear and can handle the same high and low temps than the other oils will. I will say that the LE 9920 75w140 synthetic does not have any viscosity modifiers to get it to span the 75w-140 grade, so there is no viscosity modifiers to break down. Therefore it will last a very long time, and do it with less wear and higher load carring ability---It has MONOLEC.

Sincerely, Kevin

 

[DHatfield]

I use Amsoil Series 2000 75W90 gear oil in my axles.

Lawdog, no question is really a silly question. And no you do not have to use a fiction modifier if you use the Series 2000 gear oil. Note that if you use the regular synthetic gear oil (non-Series 2000) you will have to add the modifier, I hope this helps you out.

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2001 2500HD Quad Cab SLT SB 4x4, HO Cummins, 6-speed, 3. 55 gears, LSD, brightwhite/driftwood, 4w ABS, camper and trailer tow packages, HD transfer case, snow plow prep, group, cab lights, Isspro Boost and Pyrometer gauges mounted on A-pillar, 4" JRE exhaust, BD exhaust brake. 27100 miles and counting as of 1/16/01.

1980 CJ-5, Modified for off-road use, bobbed fenders, 350 TBI, NP435 trans, 4. 56 gears, Dana 300, Dana 44 front, Dana 60 reverse-cut rear axle, ARB air lockers front and rear, 15/35/15 Super Swamper TSL on 10X15 steel rims, Cobra CB, Warn 9000I winch, nerf bars, 1/4" steel rock crawler bumper front and rear, jerri can/spare tire rack, custom roll cage.

[This message has been edited by Douglas Hatfield (edited 02-04-2001). ]

 

[Barry]

Oilman: Do you still have to use "Friction Modifiers" with the LE 9920?

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2001 2500 QC, ETH/DEE,4:10s, LSD, EZ with elbow(26. 5PSI) Boost/Pyro Guages, 4" Turbo back, BD Brake,Mag-Hytec Cover, Kleen Wheels, Energy Release, 70 gal. fuel, 20K Reese. 25,000 Miles on 01/30/01(RV Dealer)

 

[Oil Man]

Barry,
Yes LE does not add any LS modifier to their oils. They believe that there are little differences in each mfg's modifier and they suggest using the Ford modifier for the Ford and the Dodge modifier for the Dodge etc. So If you use the LE 9920 and you have LS then I would recommend that you use the one that Dodge recommends.
Kevin

 

[tlippy]

Mikey - I just put in Red Line 75W140 and the rear end is still turning. Cost was $8/qt, and it took exactly four. Only 140 I could find locally. The trickey thing - not really, just the first time i've done it - is putting the cover back on without a gasket. Did bring the cover in the house overnight so it'd warm up before I put on the silicone. Even aimed a 500W bulb on the rear end for a couple of hours. Let the installed cover sit overnight before putting in the new oil. Man was the OE oil crummy looking. All foamy and bubbly. Glad to have it out. Keep a happy rear end!

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99' Quad 4x4 A/T LB 3. 54 30K Miles.
26' Terry w/slide 7500GVWR
"KISS your truck and it will be forever faithful"

 

[lawdog]

Douglas Hatfield, Thanks for the info on the series 2000, I'll have to have dad order some up for me... .

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2000 QC SHORT BED 4X4, 24 VALVE W/ 275 HP INJECTORS, 3. 54 GEARS W/ POSI, AUTO, BLACK WITH EVERYTHING EXCEPT LEATHER,285/75R16 KELLY SAFARI AWR, RAIDER NOMAD CAB HIGH CAP,FACTORY RAZ STEREO W/ STEERING WHEEL CONTROLS, KENWOOD 848 AMP, KENWOOD EXCELON 6X9 IN DOORS AND KENWOOD EXCELON 6IN. ROUND DUAL-MAGS IN REAR DOORS, MTX FACTORY FIT BOX W/ 2-10"SUBS UNDER REAR SEAT

2001 ARCTIC CAT ZR800 TWIN LE BLACK...

 

[John]

TLippy, are you sure you used Red Line 75W-140... or was it really 85W-140? The reason I ask is because their 75W-140 has NO friction modifier, it's blended for racing applications that use a spool instead of a differential (open or LS). That is why it is labeled 75W-140NS... NS = No Spin. Their 85W-140 has a certain amount of friction modifier added however, use in Dana axles will usually require additional friction modifier.

..... just wondering

 

[MikeR]

I just changed the oil in both axles last Friday. Used Amsoil series 2000 75w90,and it does not need friction modifier.

-Mike

 

[claymike]

Thank you for all the responses. Oilman now I am confused, I called Mag-Hytec and asked them about the LE 9920 oil and he steered me to the LE 607 which is not a synthetic oil. He says that the LE 607 beats thre LE 9920 hands down according to their tests. I think the LE 607 is a 90w gear oil, but I could be wrong. Any thoughts?

Hey there Tommy good to see you have a racy rear end now.

 

[Cooker]

claymike,

I was researching the LE gear oil a while back so I may be able to help you.

The LE607 is a straight 90w. I has over 2 times the protection as LE's own 9920 so it is a better oil as far as wear resistance. The drawback is it only has a -10 pourpoint. This means if you live in a cold climate the LE607 may not be an option for you. Mag-Hytec may try to push the 607 because it does protect better and where they are located cold climate is not an issue.

IMO, and Oilman I'm sure feels differently, if you see air temp down near zero you should go with the synthetic 9920. It will be thinner at this temperature as it's pour point is near -50 (I don't remember exactly). Even though the LE607 offers over twice the protection of the 9920, the 9920 still ranks higher than some of the other well known synthetic lubes. Call Mag-Hytec or LE direct and they will send you the test results.

I plan on using the 9920 when I change the fluid again (sometime when it warms up). For me the 607 wouldn't be too good on those -5 degree mornings.

Hope this helps. Maybe Oilman will give his input.

[This message has been edited by Cooker (edited 02-06-2001). ]

 

[Oil Man]

Cooker,
You are pretty much right on and I've not got much else to add.

Kevin