Rear end fluid change
All Star
Joined: Apr 2007
Posts: 997
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From: Florida
RE: Rear end fluid change
If I was to do it, which I will do in a month at about 2500 miles I am going to replace everything (tranny, both diffs, and oil) with Royal Purple. I was watching Horse Power Tv weekend before last and they did that to a Chevy Z28 and gained 9 HP to the wheels. I'm not saying that it would work as well as it did with that since a truck is a totally different beast but its worth a try. I would none the less go with synthetic. Thats my .02
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Professional
Joined: Jul 2006
Posts: 189
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From: LA
RE: Rear end fluid change
I think I will have it changedwithmy next oil change at 20,000.
The factor gear oil is synthetic.
Part # 05010320AA SYNTHETIC GEAR LUBRICANT SAE 75W-90
Part # 04318060AB LIMITED SLIP ADDITIVE FRICTION MODIFIER
The factor gear oil is synthetic.
Part # 05010320AA SYNTHETIC GEAR LUBRICANT SAE 75W-90
Part # 04318060AB LIMITED SLIP ADDITIVE FRICTION MODIFIER
Veteran
Joined: Feb 2006
Posts: 368
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From: Saratoga Springs, Ut
RE: Rear end fluid change
FRONT AXLE
²
C205F - MoparT Gear Lubricant 75W-90
REAR AXLE
²
8 1/4 - MoparT Synthetic Gear Lubricant 75W-140
²
9 1/4 - MoparT Synthetic Gear Lubricant 75W-140
Royal Purple claims no modifiers are neccessary for LSD!!??
I have 17K on mine and boat season is almost here!!!
Time to change to make life easy on the LSD!
LB
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Professional
Joined: Jul 2006
Posts: 189
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From: LA
RE: Rear end fluid change
I called the local Dodge dealer and they told me that they use the 75w90 and only recommend the 75w140 for extreme uses (i.e. towing, mud riding).
Has anyone done their's? What did you use?
Has anyone done their's? What did you use?
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Joined: Jan 2005
Posts: 50
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RE: Rear end fluid change
I changed the rear end gear lube at 8,000 miles. I have the tow package and used Amsoil Sevre Gear 75W-140. I read an interesting article (which I cannot find now) that stated if you change the rear end lube after the breakin period (between 6,000 and 8,000 miles) that the amount of wear will be extremely minimal over the next 100,000 miles. If you don't change it then the wear will grow almost exponentially. I guess this is due to leaving the initial breakin contaminates in to slowly eat away causing more wear. I didn't really care I just changed the lube.
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Joined: Aug 2006
Posts: 325
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From: Chicagoland, IL
RE: Rear end fluid change
I just saw this on Amsoil's website....(http://www.amsoil.com/articlespr/2007/pr_SVT.aspx)
New Severe Gear 75W-110 Synthetic Gear Lube from AMSOIL
The new viscosity gear lube grade that fills the gap between the 75W-90 and 75W-140 viscosity gear lubes that most people are accustomed to using. Many used the 75W-140 to obtain extra filmprotection beyond what the 75W-90 viscosity grade offered for their differentials, but found that they sacrificed fuel economy by doing so.This new viscosity grade, 75W-110, offers a high temperature film protection beyond what a 75W-90 offers, without compromising fuel economy. This new mid-range viscosity grade for gear lubes addressesperformance, protection and fuel economy.
New Severe Gear 75W-110 Synthetic Gear Lube from AMSOIL
The new viscosity gear lube grade that fills the gap between the 75W-90 and 75W-140 viscosity gear lubes that most people are accustomed to using. Many used the 75W-140 to obtain extra filmprotection beyond what the 75W-90 viscosity grade offered for their differentials, but found that they sacrificed fuel economy by doing so.This new viscosity grade, 75W-110, offers a high temperature film protection beyond what a 75W-90 offers, without compromising fuel economy. This new mid-range viscosity grade for gear lubes addressesperformance, protection and fuel economy.
