Amsoil in rear diff?

[DocDetonancour]

Saw a post and got worried about using Amsoil. Is there a concern with noise coming from the diff due to the non factory type oil? Thanks, Doc

 

[roperteacher]

Put your worries aside! Amsoil makes a great product and there is no need to add LS additive to your diff. BUT, for some weird reason SOME of the 3rd gen trucks develope chatter that is EASILY fixed with the Amsoil slip lock additive. I have never ever had a problem with my 04,06,07 truck using amsoil. I ordered a bottle of the slip lock just in case but I have never had to use it. Chrysler is now saying you need the 75/140 in the rear diff if you tow, not the 75/90. I have used AMsoil's 75/110 as well!

 

[CDonaldson]

Actually, DC is saying that the required fluid for the AAM axles IS 75w140, not just if you tow. They are coming out of the factory with 75w140. The LS additive IS being added when customers/owners are experiencing shudder and hop, this is because of the close tollerances of the gearing in the AAM axles and break-in period. My local dealership is putting the LS additive in as part of their standard dealer prep because just about every truck has come in at it's first servicing check complaining about shudder or hop. So they are making it a standard to dealer prep for this reason, also they did mention some kind of a service memo suggesting it, but I don't have any way to verify that service memo, just take their word.



I am using the Amsoil fluids, bumper to bumper at this time and am extremely satisfied with their performance. I would not hesitate to suggest their products to anyone looking to change to high quality fluids.



CD

 

[roperteacher]

Cdonaldson, very interesting that some dealers are adding the LS additive for the dealer prep!! So I guess it is safe to say that it would not HURT anything to put the LS in there???? Very good to know!! Here is my biggest gripe then..... Why don't they change the OWERS MANUAL on these new trucks?? My new 07 still says 75/90 like they have for the last few years!!! SOme people who do not read TDR would never know it. .

 

[JHardwick]

I think these rears are just a little tempermental. I've always used Mobile1, but the last time the fluid needed changed it was winter time, and I had my buddy do it. He used synthetic fluid used in the big trucks and it chattered like hell ... ... ..... I braved the cold since it won't fit in my garage ... ... ..... and changed it back to Mobile1 and the chatter was gone.



140 variety as I've always used.





Also, some seem surprised that I'm still running an untouched NV5600 @ 325,000 miles ... ... ... ... I've always use Pennzoil Syncromesh in it.

 

[Drewhenry]

Curiosity-Amsoil Failures

I used to use Amsoil in my gasser due to the extended change intervals. A friend who I admired at the time due to his education and training as a diesel mechanic,welder and a&p mechanic gives out ridiculously long unsolicited lectures on the "problems one of his buddies had with Amsoil warranties". When pressured for his buddies name and contact info I always get put off. The complaints range from Amsoil foaming in the engine and ruining it to causing things to break in the rearend and not covering any repair costs even when "proved that the addition of their oil caused the problem".

I am all about extended intervals and additional protection and overkill(I could have purchased a flowerpoke or a duraslack but I wanted the baddest diesel powered pickup available--I also swing toward the I6 design 230Dodge, 258AMC, 300Ford).

Has anybody ever heard of any type of failure due to Amsoil and what was the result? I would really like to synthesize my truck from end to end but do not want to cause problems I can't afford to fix.

Andy

 

[SSalzer]

I run the 75-90 in mine front and rear. Never had a problem. My buddy had the Dana's in his '02. They call for the 140 in those rears.

But just a word of caution to those reading. I was given advice on this site to put Amsoil ATF in my NV5600. Like an idiot I just listened and ran it for 15000 before I realized that MTF was the correct fluid for my trans. (ATF is correct for the G56 that was also available in my year). So just be careful before you go switching to fluid viscosities that aren't recommended by the manufacturer!

 

[roperteacher]

SSalazar, I read your post on that NV issue... . GLad it turned out OK... Yesm as you read some of the posts you kind of have to consider the source at times...

 

[AKaiser]

Amsoil website has a product selection tool that tells you what to use for specific vehicle, engine, transmission, etc. by model year and manufacturer.



AMSOIL ONLINE PRODUCT APPLICATION GUIDE

 

[Dieselnerd]

Actually, DC is saying that the required fluid for the AAM axles IS 75w140, not just if you tow. They are coming out of the factory with 75w140. CD

Where did you get this information? Did DC publish it somewhere? As long as my manual says 75-90, that's what I'm going to use since it's still on warranty.

 

[roperteacher]

Dieselnerd, I think Cdonaldson got the info from her Service writer at the Dealer. John Holmes over at Carson Dodge also has a copy. I don't think it is a true TSB per se, I think it's what they call a "Tech Tip". It IS in writing. Maybe C DOnaldson will chime back in and update us. I called my Service writer and his computer is NOW calling for 140. If you put 90 in it and had a problem, I doubt they will deny your warranty with it being written in your Manual, but they would probably refill with 140. You would think they would send out an amendment to the owners manual or something????

 

[PKnoerzer]

I put Amsoil in both my differentials at 15,000 miles and just changed the rear at 67,000 miles. The Amsoil in it was as clean as new - no foaming and no noise.

 

[DPKetchum]

What weight oil was in them?

 

[PKnoerzer]

75-140 in the rear and 75-90 in the front. BTW - no L/S additive.

 

[CDonaldson]

Sorry it took so long for me to get back to this thread, out of town.



I did not say it was a TSB, I said it was some kind of DC internal service memo - of which I got the information over on the Carson Dodge site AND my local dealership confirmed that info to me verbally. I have not read the memo myself so I cannot comment on it's validity, but John Holmes is also discussing it on the Carson Dodge site, must be a real memo of some kind.



I directly questioned my local dealership about the costs associated, etc when the time came around for my trucks diffs needing to be done - asked for a quote - my service writer specifically quoted me 75w140 for both diffs and told me about the NEW DC requirement for the 75w140 in all the AAM axles-not only my 2006 but back to the previous years the AAM was used in too. He also gave me two price quotes for the diff fluid - Mopar and Amsoil - both were 75w140. They use both product lines in their serviceing depending on customer preferences. Carson Dodge also uses both product lines from what I gathered in the diff fluid discussions. The discussion about the LS additive come off Carson Dodge's site as well. I do not know about whether it is safe to run the LS with the Amsoil products or if it is even needed, the Amsoil fluid ended the occasional shudder/hop problems I was experiencing without any LS additive. Maybe it has to be added to the Mopar fluids??? I really make NO claims one way or the other, I just re-iterated what I had read, it probably would be better for people to read/interpret and ask questions on the Carson site, better straight out of the mouth that generated the discussions/answers, leaves no room for speculation or interpretation.



As far as someone recommending the WRONG fluids for a transmission, I can see where that could easily happen as there are several trannys being used in the same year trucks. I always do my own homework, ask many questions, check things several times, then the burden falls squarely where it belongs - on me. Our manuals DO have recommendations, sometimes they do not reflect the latest info, sometimes printing errors happen, so again asking many questions over and over will finally get the right answer. My dealership put a couple sticker/pasted in changes in my manual the day I bought my truck, maybe other dealerships don't do what they are supposed to do with these things? My manual also states 75w90 Mopar fluid in the diffs. I had my old diff fluids anaylized when I changed them out to the Amsoil 75w140 basically out of curiosity, since I changed the fluids out the analysis really had no bearing, just info. I am glad I did the analysis as it came back with some real concerns regarding the Mopar 75w90 that was in there and how it really did not hold up well to the period of time our manuals suggest it shoud be used.



CD

 

[DPKetchum]

I'm using Amsoil Severe gear 75/90 in both. Towing a 10k gooseneck several hundered miles I got this terrible chatter from a start and on into 2nd gear. Also started getting a shudder unloaded on left turn from a stop. Looked at u/joints,replaced u/joints due to all the suggestions from these sites. Nothing wrong with factory u/joints. Looked like new in the cups and bearings. Added a generic posi additive from a auto parts store. CURED my issue. I did find some OLD threads on another site about the same deal. By the way I did call AMSOIL tech line. (been using their products for years) to see if ANY reports on their end about this issue. He/they were short,curt,rude and hadn't a CLUE. Didn't even SUGGEST using or trying posi additive etc. AAM told me DON"T use a additive,Amsoil said their fliud didn't NEED additive in a AAM. Carson Dodge said USE a additive but had NOTHING in print about the 75w140 or using a additive BUT swore D. C. says to. I asked were it was in PRINT from D. C. I told the AAM rep about the Carson Dodge deal and he said NO its 75w90 and NO additive. Reminded me of the three monkeys.

 

[CDonaldson]

Three Monkeys . . Three Stooges . . It is very hard to get a straight answer from anyone. I e-mailed AAM and did not get back a straight answer, I got "It porbably would be a good idea to use 75w140-sure couldn't hurt anything, but their MINIMUM spec is 75w90, and no need for an additive. " In the next sentence they said "We don't warranty our axles, Dodge does, better to check with them about this. " So onto the dealerships comments as above. Then I found the threads at Carson Dodge. I have great respect for John Holmes and his opinions, after all he has tons of experience over many years. It was the information in his threads I decided to go with, I felt at least he was honest and reporting what he knew, very objectively. I know that the LS additive has been used with the Mopar fluids very successfully, I also know the Amsoil does the job without the additive. My truck is doing GREAT, much better with the Amsoil fluids over the stock Mopar fluids. I have used them for years in other vehicles, had great results, so why change to something else now when I already know how well the Amsoil performs. My questions and search for information led me right back to what I already knew.



CD

 

[Dieselnerd]

I was just getting ready for my second rear diff oil change. Since I tow a big fiver just under maximum towing capacity, maybe the 75-140 would be a good idea, at least for the rear. Thanks for the info.

 

[klenger]

I'll continue to use the 75W90 stuff in mine till someone can show me something in writing from Dodge to the contrary.

 

[DPKetchum]

I've said the very same thing to D. C. reps,Carson Dodge and AAM more then once in a couple of years and NEVER on a memo from AAM or D. C. has surfaced. Carson Dodge said it was in the 06 shop manual? Any one have one to look that fact up?