What synthetic gear lube do you use in your rear diff?

[Alan Reagan]

Where do you find this Royal Purple Max Gear? Never heard of it around here.



EMD Diesel, unless you are doing a lot of towing, you should be just fine with 75W-90. If you are towing go with the heavy weight.

 

[Jay]

Alan, Royal Purple has a dealer locator on their web site www.royalpurple.com

 

[icarus33]

Redline



ic

 

[John]

I am going to switch back to Amsoil Series 2000 75W-140 this week. I have been using the Amsoil Series 2000 75W-90 in both differentials (and will continue to do so in the front diff. ). Prior to the Amsoil I used Red Line 75W-140NS (with Red Line friction modifier) in the rear differential.



..... always keeping my eyes open for a "better" mousetrap

 

[The patriot]

71K miles, factory fill

Yea, I know... I'm a lazy sorry ba$tard.



Eric

 

[Oil Man]

Mag-Hytec cover and LE 607 gear oil before it had 200 miles on it.



Kevin

 

[John]

Excellent Kevin!

I still feel the best thing you can do for differential longevity is drain out the original gear lube at 100-200 miles. 99% of the break-in wear has already taken place by then... it's best to get rid of all the garbage so the bearings live a long and happy life.



..... followed by a refill of a quality gear lube.

 

[Kyle]

Lubrication Engineers

klenger,



Before I installed my MagHytec I had several conversations with people who really knew their lubrication. I really wanted to use synthetic because I just fealt better. Everyone I talked to that was in the know tried to talk me out of it (very politely). I finally listened and decided on the LE-607 lube. It's straight 90w but is "slipperier" and stays cooler than the synthetics. Plus it's a lot cheaper than the synthetics. The only problem is if your truck gets really cold (say 10 - 20 below zero). Then it'll get a little thick when you first take off. I see you're in God's country so that may apply to you - but then again it may not. Depends on where you park overnight. If I lived where it got real cold I'd probably go with the LE-9922 (80w-140 synth) or LE-9921 (75w-90 synth. ) if it got real REAL cold. That LE is great stuff. Switching from the OEM to the LE gave me a conservative . 75 MPG improvement (that's measured over several tanks before and after the change).



Either way you'll be real happy with the MagHytec. Just follow those install directions to the letter and you won't have any problems.



Good luck.

 

[Archive]

RedLine 80w-140.

 

[Sled Puller]

Help us out!

Kyle,

Maybe you could list the people you talked to,"in the know" I would like to hear what they have to say.



Gene

 

[Kyle]

Stand by

I'd be happy to post who they are. However, I want to first make sure it's OK with them. So give me a little time and I'll get back with those who don't mind.



Thanks for your patience.



Kyle



<Edit>

Just sent out a couple E-Mails. It's late there (and here) so they may not respond until tomorrow. Stay tuned.....

 

[mbrolin]

Sta-Lube 75-140 synthetic

 

[DCouch]

who sells LE 607 gear oil?

 

[Oil Man]

Try Mag-Hytec at 1-818-786-8325 or e-mail me for other options.



Kevin

-- email address removed --

 

[FAllen]

Using Mopar 75W-140 Synthetic for towing 5er as recommended in owner's manual.

 

[PHaller]

lube?

I used to use Redlines stuff but have switched from it to LE 607. I have a temp sensor in the rear cover and using the LE and Roys friction modifyer, my temps dropped during a hard pull with my 5er over 70 degrees. I would say that means less friction.

-Paul R. Haller-

 

[Dave Fritz]

Torco Synthetic Gear Oil API Service GL-6 75W140 in both axles.



The Mopar stuff in my rear axle was gross when I dumped it after 70k miles. I had been using the Torco GL6 dinosaur oil in my front axle (recommended by Dynatrac). It seemed to be excellent oil but I decided to switch everything to synthetic when the axle lubes were due for a change.



Dave

 

[paccool]

Changed to Eaton a few weeks ago and am having lots of trouble with chatter. Even with friction modifier. Will go to Royal Purple, have been using the RP motor oil for several years now with no problems.

 

[DHatfield]

I use Amsoil 2000 75-90.

 

[BIGNASTY]

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