Amsoil Rear Diff. Oil Recommendation???

[Challenger-II]

It is time for me to change the oil on my rear diff. for the first time. Which Amsoil synthetic should I use?? I have a 3. 54 limited slip and occasionaly only tow a 2500lb boat. Should I use the 2000 series oil and which weight? Will I need to add a friction modifier?



Thanks!!

 

[John]

Amsoil Series 2000 75W-90 will work very well in your specific situation. I would not add any friction modifier until after you have tried it without. Even so, if additional friction modifier is required, add it sparingly... one to two ounces at a time.



That said, I recently changed out my Amsoil Series 2000 75W-90 gear oil in favor of their Series 2000 75W-140 gear oil. Even though I hardly ever tow, I wanted the best protection possible.



..... just one mans perspective

 

[Timinator]

I agree. I use the series 2000 75w-90 and love it. After I drove it for a month, I determined that I needed to add some friction modifier. It took about 2 oz. to stop the chattering.

 

[klenger]

I posted this question with a poll a while back. You can read the responses at https://www.turbodieselregister.com/forums/showthread.php?s=&threadid=22083



IMHO, you could use the 75W90 with the light load you are pulling.



good luck.

 

[TowPro]

I need to change mine again (this time to the thicker stuff) but I can't remember what it holds



Application:

2wd, 3:55, Dana 80HB, 2500, stock cover.



I can't remember if it was 2 or 3 quarts, Heck maybe it was 4?



They say the first thing that goes in your looks, I can't remember what the 2nd thing was?

 

[mseitz]

riction modifier

Does the friction modifier add or reduce friction?

 

[GFoley]

I am running Series 2000 75-90 and added one bottle for LS additive. No chatter, all is well.

 

[Bill Lins]

Originally posted by TowPro

Application: 2wd, 3:55, Dana 80HB, 2500, stock cover.



I can't remember if it was 2 or 3 quarts, Heck maybe it was 4?

Mine's the same as yours, and takes 4 qts.

 

[beartrace]

I went to the Mag-Hytec rear diff cover and Amsoil Series 2000

75W- 140 gear oil about 5000 miles ago. I did not have to add any friction modifier. Since I tow a 5th wheel, I believe that this is good insurance.

 

[Challenger-II]

Maybe a stupid question here... . but, is there any reason I cant pump out the old fluid and refill with new instead of having to remove the diff. cover? Is there a collection magnet in there??

 

[Deezul1]

The magnet is on the plug, pumping it should work fine and only leave a slight amount of the old in there, it depends on how fussy you are about that kinda stuff but cant imagine it would make much difference other than no visual inspection.

Thats how they do oil changes on lots of inboard boat motors.

 

[BigDaddy]

I am also using the AMSOIL Series 2000 75W-90 Gear Lube in the front and rear.



Check the Group Purchase Page for some good prices. When you call, Gene or Sheryl can recommend the weight/visosity based on your needs.

 

[John]

friction modifier

Originally posted by mseitz

Does the friction modifier add or reduce friction?

The friction modifier reduces friction, allowing the clutch packs to slip thereby reducing the tendency of LSD shuddering in tight, low speed turns (on high traction surfaces).

 

[mseitz]

friction modifier

Thanks John. I thought that I was being ignored for a dumb question. Mike S.

 

[Challenger-II]

Big Daddy..... How or where do I find the group purchases????

 

[John]

Re: friction modifier

Originally posted by mseitz

Thanks John. I thought that I was being ignored for a dumb question.

Hey Mike, that's what the TDR and this BB are all about... members helping other members.

 

[JohnE]

Mike;



There are a lot of Rammers such as John (T) that have researched this stuff to the nth degree and willingly share it. Some are parrots of information, so take care.





I'm in the process of changing to AMSOIL. The rear pumpkin (2wd here) will get the Series 2000 70W-90. My main reason for the light stuff over the 75W-140 is for the winter slippery factor. I have around 4 months below 32°F. temperatures.



I'm overly fussy on drain factors. I always drop the rear cover and hoist each axle to make sure the tubes are cleared as well. Of course, I do this after a nice drive to warm the oil.



The group purchase I know is from <a href=http://www.wwcd2.com/ target=_blank>wwcd2 Discount Diesel Accessories</a>. The last I checked you can get AMSOIL at dealer prices. I'm getting mine from a local dealer at similar rates.



My 2 reale (bits)



-John

 

[John]

Excellent advice JohnE

Originally posted by JohnE

I'm overly fussy on drain factors. I always drop the rear cover and hoist each axle to make sure the tubes are cleared as well. Of course, I do this after a nice drive to warm the oil.

Good point John! I've been doing the same ritual for many years although, I haven't removed the diff. cover since I added my Mag-Hytec diff. cover. As I have setup many differentials in the past (i. e. , ring and pinion swaps and locker upgrades), I know just about what to expect in the way of wear material on the drain plug and dipstick/fill plug. If anything looked out of the ordinary, you can bet that Mag-Hytec diff. cover would be off in a heartbeat for internal inspection. In addition to elevating each axle tube for a complete drain, I level the rear differential assembly prior to refilling with gear oil for an accurate fill level.