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Yesterday I serviced my transmission and transfer case and refilled with Amsoil ATF. Has anyone seen MPG improvement with this ? I did it mostly for improved component life. A little more MPG's would be nice when diesel is $4.49 a gallon!!
 

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When I went to synthetic ATF, (Amsoil) my trans temp dropped a little under load but the MPG didn't change. I have hand calculated my MPG and keep record on every tank since new so I should have recognized a change. I too did the change for life expectancy though. Jeff
 

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I am an Amsoil Preferred Customer and what a waste... I have bought Amsoil for my transmission, engine and rear differential. I noticed that since I filled the rear diff with Severe Gear 75/90 that it was slipping. I drove the truck that way for 10 months. I finally added some Dodge additive to (hopefully) help the slip some and called the tech support at Amsoil. The tech was rude... interrupted me before I could finish sentences and told me to drain the differential and put Dodge fluid back in! $100 worth of Amsoil (8 qts. + $19.95 of dodge additive) in the differential = trash. I told them I'm DONE with Amsoil and they can kiss my a$$... Royal Purple here I come!
:RANTIN:
 

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I am an Amsoil Preferred Customer and what a waste... I have bought Amsoil for my transmission, engine and rear differential. I noticed that since I filled the rear diff with Severe Gear 75/90 that it was slipping. I drove the truck that way for 10 months. I finally added some Dodge additive to (hopefully) help the slip some and called the tech support at Amsoil. The tech was rude... interrupted me before I could finish sentences and told me to drain the differential and put Dodge fluid back in! $100 worth of Amsoil (8 qts. + $19.95 of dodge additive) in the differential = trash. I told them I'm DONE with Amsoil and they can kiss my a$$... Royal Purple here I come!
:RANTIN:

U mean that u was having slipping in the rear end or did I misunderstand?
 

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Yes the rear differential was slipping. The tech at Amsoil was adamant to NOT add any friction modifier because the 75/90 "already has it" and then he changed his story to "I would add a little at a time" then to "I would drain it and refill with Dodge because Amsoil is made for STOCK applications" You know I'm taking his advice - I just bought a case (4 gallons) of Royal Purple 15W40 on eBay for $99.00 with free shipping! CHEAPER THAN AMSOIL TOO hahahahahahahahahaha!
 

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I use Amsoil in my tranny, transfer case & diffs. Not much change in mpg. I have had good luck w/Amsoil and customer service. Just remember most that sell Amsoil is independent sellers. If one does not give good customer service then go find another, well worth it. The two who I would go through is Duluth Diesel or Diesel Nuts Motorsports.
 

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Yes the rear differential was slipping. The tech at Amsoil was adamant to NOT add any friction modifier because the 75/90 "already has it" and then he changed his story to "I would add a little at a time" then to "I would drain it and refill with Dodge because Amsoil is made for STOCK applications" You know I'm taking his advice - I just bought a case (4 gallons) of Royal Purple 15W40 on eBay for $99.00 with free shipping! CHEAPER THAN AMSOIL TOO hahahahahahahahahaha!
Ok, I see. Your limited slip was acting like a limited grip:lol3:
 

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you got it throughout years of dependability and service of long term wearparts on the trucks the proof is in the pudding!!!
 

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I am an Amsoil Preferred Customer and what a waste... I have bought Amsoil for my transmission, engine and rear differential. I noticed that since I filled the rear diff with Severe Gear 75/90 that it was slipping. I drove the truck that way for 10 months. I finally added some Dodge additive to (hopefully) help the slip some and called the tech support at Amsoil. The tech was rude... interrupted me before I could finish sentences and told me to drain the differential and put Dodge fluid back in! $100 worth of Amsoil (8 qts. + $19.95 of dodge additive) in the differential = trash. I told them I'm DONE with Amsoil and they can kiss my a$$... Royal Purple here I come!
:RANTIN:
The AAM axles do not require an additive because they do not have clutches. It is a geared ls. I'm not sure what it is called, but have changed mine twice. I am running Amsoil in mine without any trouble.

Randy
 

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You're right.....

From an ad for the 11.5:
The patented design of parallel axis planetary helical gears provide a quiet, automatic splitting of torque. Power transfer goes literally unnoticed by the driver - even in front wheel drive axles.

This Torsen unit performs like an open differential under normal driving conditions and automatically transfers torque to the wheel with better traction when ground conditions warrant. The limited slip responds instantly to torque feedback, anytime, at any speed.


No Clutches
No Cones
No Maintenance
No Additive Required

ok... It's not the Amsoil - but why would the Technical representative recommend the additive??? I should have done my research - not called that idiot - and had $20 in my wallet...

Why was my limited slip "acting like a limited grip"?

I wonder if an air locker is made for it?

Kinda hijacking the thread.... sorry. I have Amsoil in my tranny with no problems.
 
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