GMCforum
For enthusiast of the Classic GMC Motorhome built from 1973 to 1978. A web-based mirror of the GMCnet mailing list.

Home » Public Forums » GMCnet » 3.70 limited slip - oil type (New install and break in)
3.70 limited slip - oil type [message #163201] Fri, 16 March 2012 16:06 Go to next message
John Heslinga   Canada
Messages: 632
Registered: February 2011
Location: Edmonton, Alberta, Canada
Karma: 4
Senior Member
Most of my Power Module I've been working on is now in place and it's time to add fluids.

I purchased a new 3.70'limited slip Diff from Applied. Jim did tell me what I needed to fill it, but now I want to be sure I remember correctly. [I have a mind like a steel trap - "Rusted Shut" (grin) ] it's interesting that with my search of the many discussions on the upgraded diffs, the actual lube oil was not identified.
This a fresh new unit and it will need breaking in and I will need to keep warrantee specs satisfied. I believe that I should fill it with extreme pressure 80W-90 gear oil with no additives for the limited slip. Then drain after 3000 miles. I also understand that the refill should be with synthetic 80W-90 and no additives.

Looking for (at least) a few confirmations or corrections from those of you who have one yourself please.

I love the discussions and differences of opinions Because they are generally informative as well. Therefore, if you have anything to add to the discussion- Go For It

Thanks


John and Cathie Heslinga 1974 Canyonlands 260 455, Manny tranny and 1 ton, 3:70 LS, Red Seal Journeyman, DTE, BEd. MEd. Edmonton, Alberta
Re: [GMCnet] 3.70 limited slip - oil type [message #163211 is a reply to message #163201] Fri, 16 March 2012 17:40 Go to previous messageGo to next message
jimk is currently offline  jimk   United States
Messages: 6734
Registered: July 2006
Location: Belmont, CA
Karma: 9
Senior Member
You can run any kind of rear end lub.
Unlike other outfits, we know grease will not make much difference to
wear so we have no hassle warranty and you will inform others and we
sell more and that is how we have sold over3,000 final drives.

On Fri, Mar 16, 2012 at 2:06 PM, John Heslinga <rbeeper@hotmail.com> wrote:
>
>
> Most of my Power Module I've been working on is now in place and it's time to add Yfluids.
>
> I purchased a new 3.70'limited slip Diff from Applied. Jim did tell me what I needed to fill it, but now I want to be sure I remember correctly. [I have a mind like a steel trap - "Rusted Shut" (grin)   ] it's interesting that with my search of the many discussions on the upgraded diffs, the actual lube oil was not identified.
> This a fresh new unit and it will need breaking in and I will need to keep warrantee specs satisfied.    I believe that I should fill it with extreme pressure 80W-90 gear oil with no additives for the limited slip.  Then drain after 3000 miles. I also understand that the refill should be with synthetic 80W-90 and no additives.
>
>  Looking for (at least) a few confirmations or corrections from those of you who have one yourself please.
>
> I love the discussions and differences of opinions Because they are generally informative as well.   Therefore, if you have anything to add to the discussion- Go For It
>
> Thanks
>
> --
> John and Cathie Heslinga
> 1974 Canyonlands 260
> TC4W  "Too Cool For Words"
> Retirement Projects Galore
> Edmonton, Alberta
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist



--
Jim Kanomata
Applied/GMC, Fremont,CA
jimk@appliedairfilters.com
http://www.appliedgmc.com
1-800-752-7502
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist


Jim Kanomata
Applied/GMC
jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502
Re: 3.70 limited slip - oil type [message #163267 is a reply to message #163201] Sat, 17 March 2012 12:23 Go to previous message
John Heslinga   Canada
Messages: 632
Registered: February 2011
Location: Edmonton, Alberta, Canada
Karma: 4
Senior Member
Jim:
Thanks a million for the confirmation of your support after purchasing one of your products!!

I intended to call you directly. But I have been working in a leased building and using my cell phone from there would have been an international long distance call during prime time. Very expensive indeed.

I have seen diffs and manual transmissions being filled with dexron II in the past and I wanted to be sure I would do what my gut told me.

I see that the slip limiting technology that final drive uses is pressure exerted on the side gears by metal friction blocks and springs. Clutch types of Limited slip technology would use friction modifiers in the lube. This one therefore would not need modifiers.

I'm assuming that everyone is then simply using the standard EP 80W-90. Glad to hear that.

Cheers Beers and Best Regards!!!


John and Cathie Heslinga 1974 Canyonlands 260 455, Manny tranny and 1 ton, 3:70 LS, Red Seal Journeyman, DTE, BEd. MEd. Edmonton, Alberta
Previous Topic: Cruise Control -
Next Topic: Extra Benefit For the Chili Cookers
Goto Forum:
  


Current Time: Fri Oct 11 09:27:35 CDT 2024

Total time taken to generate the page: 0.00644 seconds