Amsoil gear lube for front and rear end, which one and what weight? - Diesel Forum - TheDieselStop.com
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Old 08-10-2006, 12:19 PM   #1 (permalink)
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Amsoil gear lube for front and rear end, which one and what weight?

I am getting ready to order some Amsoil gear lube for my 99 F-250 and I have some questions...
(1) What weight for front and rear?

(2) What rear end do I have? I know it's a 3:73

(3) How much do I put in the front and rear?

(4) Do I need the friction modifier in my limited slip rear?

(5) Do I want the Severe gear or regular synthetic gear oil?
For the front, they list 75W-90 in both Severe and regular
synthetic
For the rear, they list 75W-140 Severe and 80W-140 regular
synthetic, Why the difference in weight?

Thanks for the help!
Daryl
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Old 08-10-2006, 03:37 PM   #2 (permalink)
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Re: Amsoil gear lube for front and rear end, which one and what weight?

[ QUOTE ]
(1) What weight for front and rear?

[/ QUOTE ]

75w140 for the rear, 75w90 for the front.

[ QUOTE ]
(2) What rear end do I have? I know it's a 3:73

[/ QUOTE ]

Ford/Visteon built in the Sterling MI axle plant with 10.5" ring gear.

[ QUOTE ]
(3) How much do I put in the front and rear?

[/ QUOTE ]

Rear end holds more than 3 quarts, so buy 4.

Front end of a '99 SRW pickup holds almost two quarts, so buy two.

[ QUOTE ]
(4) Do I need the friction modifier in my limited slip rear?

[/ QUOTE ]

Maybe, maybe not. AMSoil says: "AMSOIL gear oils are formulated with friction modifiers for limited slip differential applications. There is no need to add limited slip or additional additives."

But some users have said you still need some friction modifier in some - not all- PSD rear ends.

After you have it changed and drive a few miles, then find a big parking lot and do some figure eights with the steering wheel going from lock to lock. If you don't get any racket out of the rear end of the truck - caused by the rear axle locking and the rear tires bouncing as they drag around the curve, then you don't need any friction modifier. If you get the racket, then I'd add one ounce. Continue driving for a few miles, then testing with figure eights again, and then adding one ounce, until the racket goes away.

[ QUOTE ]
(5) Do I want the Severe gear or regular synthetic gear oil?

[/ QUOTE ]

First I would contact Bob or Sheryl Riley at www.dieselsite.com and get their opinion. Since they have only the Series 2000 Gear Lube on their website, I'll bet that's the one you'll want. [img]/ubbthreads/images/graemlins/cool.gif[/img]

[ QUOTE ]
For the front, they list 75W-90 in both Severe and regular
synthetic
For the rear, they list 75W-140 Severe and 80W-140 regular
synthetic, Why the difference in weight?

[/ QUOTE ]

Some folks don't know what Ford requires. 75w140 synthetic in the Ford rear end. 75w90 synthetic in the Dana front axle.

80w140 is for some other application. :

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Old 08-10-2006, 08:10 PM   #3 (permalink)
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Re: Amsoil gear lube for front and rear end, which one and what weight?

Scroll down to the synthetic gear lube recommendation chart on this page. It says for its first choice for light duty diesel trucks to use Severe Gear 75w-90(SVG) and 75w-140(SVO). This is how I made my decision on which one to use. Hope this helps.
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Old 08-11-2006, 06:43 AM   #4 (permalink)
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Re: Amsoil gear lube for front and rear end, which one and what weight?

I will want to use the Severe Gear. The www.thedieselsite.com website must not be updated. AMSOIL has not made the series 2000 for a least a year. The Severe Gear replaced it. Yes, it has the friction modifiers in it already. You do not need to put that in. Any other questions, please post here and I will answer them.
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Old 08-11-2006, 07:21 AM   #5 (permalink)
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Re: Amsoil gear lube for front and rear end, which one and what weight?

I went with Amsoil, in my Y2K-X....

The front, and rear axel, plus the transfer case, seam to be holding up very well, even after years of service.....It did require "2" bottles of limited slip juice to solve the grabbing problem in the rear-dif....Other than that...it's still clear after 50K miles...

Unfortunately, I can't say the same thing about the tranny....
I'm ""NOT"" a 100% sure...""BUT"" I suspect that the 'friction' differential of the Amsoil product was instrumental in the destruction of my transmission.....
In other words..it slipped to much, and burnt up the clutches....
$4000 later, I'm using Schaffer oil.....NOT even Mobil 1, either....
Cuz they've gone and changed their formula also...

You gotta be careful with this stuff....
Fomoco, synthetic differential grease, is recommended by them....costs a lot, and ISN'T ANY GOOD.....>>PERIOD<<<

So the question I have is this???

>>>WHY DOES EXPERIENCE RUN SUCH AN EXPENSIVE SCHOOL???<<<<
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Old 08-11-2006, 10:48 AM   #6 (permalink)
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Re: Amsoil gear lube for front and rear end, which one and what weight?

If you used the Series 2000 gear lube in your Ex. then, yes you would have needed the Limited slip juice. AMSOIL has refourmulated the severe gear, and it has the limited slip juice in it.
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Transfer flow 57 gallon replacement tank
Cap
Line-x spray in
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Old 08-11-2006, 10:28 PM   #7 (permalink)
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Re: Amsoil gear lube for front and rear end, which one and what weight?

I used severe gear and needed limited slip additive.
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Old 08-14-2006, 09:12 AM   #8 (permalink)
 
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Re: Amsoil gear lube for front and rear end, which one and what weight?

We just haven't updated out Amsoil section in some time. Since Amsoil won't allow the prices to be posted or an online purchase, we just take care of the calls when they come in. I'll get to the update soon.

The Severe Gear has replaced the 2000 and no modifier is needed.
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Old 08-14-2006, 09:48 AM   #9 (permalink)
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Re: Amsoil gear lube for front and rear end, which one and what weight?

[ QUOTE ]
I went with Amsoil, in my Y2K-X....

The front, and rear axel, plus the transfer case, seam to be holding up very well, even after years of service.....It did require "2" bottles of limited slip juice to solve the grabbing problem in the rear-dif....Other than that...it's still clear after 50K miles...

Unfortunately, I can't say the same thing about the tranny....
I'm ""NOT"" a 100% sure...""BUT"" I suspect that the 'friction' differential of the Amsoil product was instrumental in the destruction of my transmission.....
In other words..it slipped to much, and burnt up the clutches....
$4000 later, I'm using Schaffer oil.....NOT even Mobil 1, either....
Cuz they've gone and changed their formula also...

You gotta be careful with this stuff....
Fomoco, synthetic differential grease, is recommended by them....costs a lot, and ISN'T ANY GOOD.....>>PERIOD<<<

So the question I have is this???

>>>WHY DOES EXPERIENCE RUN SUCH AN EXPENSIVE SCHOOL???<<<<

[/ QUOTE ]

it could be very possible you needed a different atf than what you
used, what did you use? universal ATF, I have had good luck using Amsoil super shift racing fluid in a few different applications,
also remember depending on which slush box you have slipping, is either failure of mechanical hydralic pressure loss or electronic hydralic pressuure loss.
E4OD or 4R100 or the newer 6.0 trans are all goverened by electronics
that do fail and cause mechanical failure.
dont be so quick to blame the fluid, but without all the fact's in you still could be right
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