Rear Diff Fluid

[idiabuse]

That's a little misleading. Drain interval for our trucks is between 50-100k ( 50k for severe service which would include those of us who do heavy towing or spend a lot of time on dirt roads ) Big truck axles are built with a bit more overkill and have a higher drain interval on dino oil to begin with

Well OK
Misleading? well who owns a vehicle longer than ten years? especially a 20+ year old vehicle?
Ok I do, but most people never service the transmission or rear diff until FAILURE.
So my thinking is those people that actually decide to change fluids in a diff or a slushbox, AMSOIL is a lifetime fill for them.
And to add, AMSOIL did, or still may have a lifetime fill interval on pass car diffs and light trucks.
I have serviced hundreds of rear axles, I can safely say that AMSOIL is a lifetime lubricant compared to anything NAPA carries.

 

[gatorman21218]

My theory in something without an oil filter, Id rather use a conventional oil or midgrade oil and change it more often than using a high grade oil and never changing the fluid.

 

[FORDF250HDXLT]

My theory in something without an oil filter, Id rather use a conventional oil or midgrade oil and change it more often than using a high grade oil and never changing the fluid.

hopefully your opinion on that changes one day.
the benefits of synthetics is just far too great to be missing the boat on.

 

[idiabuse]

My theory in something without an oil filter, Id rather use a conventional oil or midgrade oil and change it more often than using a high grade oil and never changing the fluid.

If the lubricant used allows for metal to metal contact then yea, gotta drain out the metal and pour in some fresh lube.
AMSOIL gear oil, eliminates wear, so like I said lifetime fill.
I will also add that AMSOIL gear oil will deliver more miles to a tank of fuel from less friction than the toothpaste conventional gear lube...


Javier

 

[gatorman21218]

so what about the clutch pack? those things will still wear with synthetic right?

 

[rjjp]

If the lubricant used allows for metal to metal contact then yea, gotta drain out the metal and pour in some fresh lube.
AMSOIL gear oil, eliminates wear, so like I said lifetime fill.
I will also add that AMSOIL gear oil will deliver more miles to a tank of fuel from less friction than the toothpaste conventional gear lube...


Javier

I call BS... It may severely reduce it, but you cannot completely eliminate wear in a gear train.

 

[CDX825]

You will reduce wear with synthetic but not completely eliminate it. Even with the clutch packs.

Biggest benefit with synthetic will be increased fuel economy. It will also do better in extreme temperature situations, cold and hot.

Most vehicles end up in the junk yard before the rear end wears out and most of them are probably still filled with the factory fill. Wear is not something I worry about in a diff.

 

[ADV]

can i use a regular 80w 90 gear lube? thats what my parts guy told me it calls for. same for the front diff. i do not have ls

 

[idiabuse]

I have shimmed up many a FORD 9inch clutch pak on my own vehicles only because I dont mind the banging and noise that comes along with it.

In the past using mud for gear oil I would of burnt up the clutches and had to replace, wich I have done along with wear on the ring and pinion.

Since the upgrade to a real lubricant I was suprised to find out the clutch units I shimmed up that were very notchy and noisy but held both wheels when I needed it, I found that all the noise and clunking when turning was completely eliminated, when at road speed.
During slow speed you could feel the resistance from the clutches but the noise was gone.
Recently I pulled a unit apart to put into another car and the clutches had absolutely no wear so I put it all back together.
This 9inch rear with tires mounted on the axles and the car in the air, I can turn the yoke with my pinky finger and the whole diff spins effortlessly.
So to say the rear diff is no big deal in the lube department I call BS

Gear oil is very important, cause not even once do I want to open a diff and spend money repairing something, not even once!

Javier