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Rear Diff fluid for 99 durango #4650908
01/30/18 10:02 AM
01/30/18 10:02 AM
Joined: Jun 2007
Posts: 96
Charleston, SC
Moose016 Offline OP
Moose016  Offline OP
Joined: Jun 2007
Posts: 96
Charleston, SC
Hello,

I've got about 90K on my second rear differential so I try to be vigilant about changing the fluid. I've been changing it about every 30K and am overdue by that measure for another change. I had been running amsoil long life 75-90 but have been reading that severe gear might be a better choice given the limited capacity. Also seen some stuff saying that 75-90 might be too light after the SAE90 split and to go with 75-110. Does that sound right? It is a 5.9L with an open diff. I rarely do any towing, it is usually just daily driving. Any feedback is appreciated.

Thanks

Re: Rear Diff fluid for 99 durango [Re: Moose016] #4650917
01/30/18 10:13 AM
01/30/18 10:13 AM
Joined: Jan 2018
Posts: 31
Chester County/Pa.
Dobbie Offline
Dobbie  Offline
Joined: Jan 2018
Posts: 31
Chester County/Pa.
I personally run Mobil One LS 75W90 in both differentials in my Ram. Nice & quiet & I do no towing also.

Re: Rear Diff fluid for 99 durango [Re: Moose016] #4650924
01/30/18 10:18 AM
01/30/18 10:18 AM
Joined: Dec 2017
Posts: 2,307
SE British Columbia, Canada
Snagglefoot Online content
Snagglefoot  Online Content
Joined: Dec 2017
Posts: 2,307
SE British Columbia, Canada
How many miles did you get on the first differential and was that fluid ever changed? Iím thinking you are gun shy on this. You probably donít have to change your diff fluid for another 100,000 miles but do what you like. Certainly you arn't under ďsevereĒ conditions.


If you want the job done right......do it yourself.
Re: Rear Diff fluid for 99 durango [Re: Moose016] #4650932
01/30/18 10:24 AM
01/30/18 10:24 AM
Joined: May 2012
Posts: 1,333
Winchester, Indiana
SubieRubyRoo Offline
SubieRubyRoo  Offline
Joined: May 2012
Posts: 1,333
Winchester, Indiana
I like Motul Gear 300, it made the tranny and rear diff in my Subaru smooth and quiet (much more so than several other fluids). Severe Gear is great as well, along with Delvac.

It's hard to go really wrong with just about any synthetic gear lube these days. Find one that's available and fits your budget, change at 30k, and don't sweat it. Too thick a gear lube can lead to bad things as well. You're not severe service.

Re: Rear Diff fluid for 99 durango [Re: Snagglefoot] #4650937
01/30/18 10:30 AM
01/30/18 10:30 AM
Joined: Jun 2007
Posts: 96
Charleston, SC
Moose016 Offline OP
Moose016  Offline OP
Joined: Jun 2007
Posts: 96
Charleston, SC
Originally Posted By: Snagglefoot
How many miles did you get on the first differential and was that fluid ever changed? Iím thinking you are gun shy on this. You probably donít have to change your diff fluid for another 100,000 miles but do what you like. Certainly you arn't under ďsevereĒ conditions.



I bought it with a broken differential, so had the new one put in as soon as I took ownership of it. I think the first one lasted about 90K. You are right, it likely is overkill. I don't mind changing the fluid, peace of mind I guess. I think my last change was probably 6+ years ago.

Re: Rear Diff fluid for 99 durango [Re: Moose016] #4650951
01/30/18 10:40 AM
01/30/18 10:40 AM
Joined: Sep 2015
Posts: 2,256
Malaysia
zeng Offline
zeng  Offline
Joined: Sep 2015
Posts: 2,256
Malaysia
Originally Posted By: Moose016
Hello,

I've got about 90K on my second rear differential so I try to be vigilant about changing the fluid. I've been changing it about every 30K and am overdue by that measure for another change. I had been running amsoil long life 75-90 but have been reading that severe gear might be a better choice given the limited capacity. Also seen some stuff saying that 75-90 might be too light after the SAE90 split and to go with 75-110. Does that sound right? It is a 5.9L with an open diff. I rarely do any towing, it is usually just daily driving. Any feedback is appreciated.

Thanks

Amsoil SS 75W110 KV @40*C is 140 cSt, falling into 135-165 cSt ISO 150 grade;
Amsoil Long Life 75W90 KV @40*C is 130 cSt, and
Amsoil SS 75W90 KV @40*C is 102 cSt , falling into 90-110 cSt ISO 100 grade.
Your plan on 75W110 is good.
No, there is no such thing as too thick a gear oil causing problem in a differential.It reduces the goo instead.

Re: Rear Diff fluid for 99 durango [Re: Moose016] #4650956
01/30/18 10:42 AM
01/30/18 10:42 AM
Joined: Jul 2012
Posts: 376
Michigan
khittner Offline
khittner  Offline
Joined: Jul 2012
Posts: 376
Michigan
I've run Severe Gear 75W-90 in my '95 Dakota's OE tranny and rear end for the past 40K, and Mobil 1 75w-90 every 30K miles before that (the truck has 221K miles on it now). I think I'll change those fluids again at 230K, which will about 50K on the Amsoil. The truck runs fine, and my gear lubrication choices don't keep me up at night.

Re: Rear Diff fluid for 99 durango [Re: Moose016] #4651006
01/30/18 11:27 AM
01/30/18 11:27 AM
Joined: Oct 2014
Posts: 1,218
NoVA
Jimzz Offline
Jimzz  Offline
Joined: Oct 2014
Posts: 1,218
NoVA
Since you are not towing then run a 75w90

I have a 2007 Dakota V8 and run 75w90, I think supertech, in the diff.


yup
Re: Rear Diff fluid for 99 durango [Re: Moose016] #4651044
01/30/18 12:17 PM
01/30/18 12:17 PM
Joined: Jun 2012
Posts: 1,699
USA
oldhp Offline
oldhp  Offline
Joined: Jun 2012
Posts: 1,699
USA
Mobil 1, Pennzoil, RedLine, Valvoline, any of these synthetic 75W90's could be used with 100% confidence. Cheers1



Re: Rear Diff fluid for 99 durango [Re: Moose016] #4651073
01/30/18 12:48 PM
01/30/18 12:48 PM
Joined: Jun 2007
Posts: 96
Charleston, SC
Moose016 Offline OP
Moose016  Offline OP
Joined: Jun 2007
Posts: 96
Charleston, SC
Awesome, thanks for all the feedback. Now I'm kind of swinging back to Mobil 1 for ease of access, I think I had read a couple disparaging things about their gear oil, but not sure it was justified. No super strong feelings for Amsoil over Mobil 1 in this applicaiton? Probably just asked a loaded question.


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