Re: What's the factory spec for oil in 9.25" axles?
[Re: MoparJoe]
#179656
01/01/09 04:48 PM
01/01/09 04:48 PM
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Joined: Sep 2004
Posts: 6,906
IL, Aurora
ademon
master
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master
Joined: Sep 2004
Posts: 6,906
IL, Aurora
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80/90 for reg duty, 75/140 synthetic for towing and severe duty, This is from my owners manual for my 03 Dakota 9.25 limited slip 3.55. Had my rear end rebuilt at 30k under warranty started to howl bad, Then at 90k it started to growl and howl loudly again, this time i got the rebuild kit from Randys and replaced the carrier, pinion, bearings and races, the pinion seal, and crush sleeve, and axle bearings and seals. BTW i think the axle problems were do to the small vent barbed fitting being clogged i took a drill bit that was just a hair bigger than the original size and drilled it out both times the gear oil was milky because of the pluged vent 
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Re: What's the factory spec for oil in 9.25" axles?
[Re: ademon]
#179658
01/01/09 10:38 PM
01/01/09 10:38 PM
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Joined: Mar 2003
Posts: 1,806
Newfoundland Canada
Mopar1
top fuel
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top fuel
Joined: Mar 2003
Posts: 1,806
Newfoundland Canada
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Quote:
80/90 for reg duty, 75/140 synthetic for towing and severe duty, This is from my owners manual for my 03 Dakota 9.25 limited slip 3.55. Had my rear end rebuilt at 30k under warranty started to howl bad, Then at 90k it started to growl and howl loudly again, this time i got the rebuild kit from Randys and replaced the carrier, pinion, bearings and races, the pinion seal, and crush sleeve, and axle bearings and seals. BTW i think the axle problems were do to the small vent barbed fitting being clogged i took a drill bit that was just a hair bigger than the original size and drilled it out both times the gear oil was milky because of the pluged vent
80W90 IS for heavy and severe duty. Up until about 10 years ago that's what most heavy truck fleets were using. A lot of drivers I know had premature bearing failure using 75W140 syn oil in there diffs and transmissions.
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Re: What's the factory spec for oil in 9.25" axles?
[Re: Mopar1]
#179659
01/02/09 12:17 AM
01/02/09 12:17 AM
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Joined: May 2003
Posts: 13,187
aZLiViN
J_BODY
I Live Here
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I Live Here
Joined: May 2003
Posts: 13,187
aZLiViN
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Quote:
80W90 IS for heavy and severe duty. Up until about 10 years ago that's what most heavy truck fleets were using. A lot of drivers I know had premature bearing failure using 75W140 syn oil in there diffs and transmissions.
Working at a dealer I would say that you mixed those two up. We saw a ton of rear gear failures in the 1500 trucks. Nothing tests a rear gear like and overzealous Californian towing his huge boat across the 120+ degree desert to get to the Colorado River. 75-140 worked way better. I know that in my 95 1500 when I would tow my enclosed car trailer in the summer I would get weapage around that lil rubber fill plug from the heat. Switched to 75/140 and it never happened again. ......as always, FWIW.
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Re: What's the factory spec for oil in 9.25" axles?
[Re: ademon]
#179660
01/02/09 02:38 AM
01/02/09 02:38 AM
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Joined: Sep 2005
Posts: 6,516
Santa Cruz, California
Lefty
OP
master
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OP
master
Joined: Sep 2005
Posts: 6,516
Santa Cruz, California
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Quote:
80/90 for reg duty, 75/140 synthetic for towing and severe duty, This is from my owners manual for my 03 Dakota 9.25 limited slip 3.55.
Thank you! 
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