Rear Axle Fluid Question.....

[TxDieselKid]

Ok gang, how often should you change you rear axle fluid? One service writer told me 30,000 and the next dearship told me 12,000. What gives??? Of course they tell me this after I tell them how many miles I got on it (33,000)



This comes up because I don't have my truck here and so I can't look it up. The truck in at a dealer's in Katy now because the rear axle makes a "binding" kind of noise, and feel when you turn the wheel. I thought it might be a Spider Gear, they said from my description that it might be a bering. The guy who drove it around the lot said "Well that is what happens when the fluid breaks down. " I wanted to say ?well then why don't it do it going stright?"



Anyways, I am thinking(about sure) that they will fix what is wrong by way of warrenty work, have one of their workers sign off on it with my name, then just say the fluid needed to be changed, and charge me the $150 freaken dollors to change it so they make SOME money off of me. I told them I got the fluid at home(Royal Purple 85W synthedic) and they start harping about Friction Modifier. I wanted to say BULL S***, but don't have the ba!!s.





Just needed to vent guys, sorry,

ANdrew

 

[M Barnett]

If you have a limited slip differental, you need the friction modifier. Sounds like this is your problem. Quite a bit of info in the archives.

Michael

 

[TxDieselKid]

thanks Mike, like I said I just needed to vent more then anything. They got the truck, and here I am. Plus I can't get this stuip HTML thing working, not to mention the hugar factor.



Just not a good day,

Andrew

 

[Rob Thomas]

Andrew,



Lookin' at my manual it says... ... ..... schedule "A" all the way to 150,000 miles says nothin' 'bout changin' the rear axle fluid... ... ... ... ..... schedule "B" at 30,000 miles and every 15,000 thereafter it should be changed.





Later, Rob

 

[TxDieselKid]

Thanks Rob,

I would bet the "B" is the heavy duty(read towing) aint it? Since that truck aint haul nothing butt my butt to Indiana and back, I would think I'd be on "A".



Thanks again for your help,

Andrew

 

[Rob Thomas]

Originally posted by TxDieselKid

Thanks Rob,

I would bet the "B" is the heavy duty(read towing) aint it? Since that truck aint haul nothing butt my butt to Indiana and back, I would think I'd be on "A".



Thanks again for your help,

Andrew

Yep, "B" is heavyduty, dusty, dirty, towing and general beatin' enviernments. Judgin' in the lack of truck washin' you do, I'd bet yer in the "B" catagory.







Later, Rob

 

[TxDieselKid]

I have the LSD, but I have heard of pepople who have not ran the modifer, is this safe? Again, I am putting in Royal Purple 85w Synthetic



Andrew



On Edit- With this oil, I do not need the modifer becase the bottle states that it has it in it already, and it reads. . "Contains Limited Slip Additive"

 

[Rob Thomas]

I run Amsoil in mine, I didn't add any modifier, and I don't hear any noise from my axle, then again, I have 5" stacks right behind my head.



Later, Rob

 

[Mad Max]

@ GOODSON???

TX, sounds like you're in my neck of the woods. I'm going on memory here, but I think schedule B calls for every 15K miles.



If you don't subject your rig to serious towing or excessive payloads, OR HIGH WATER, your rear end should be fine.



As for w/ or w/o friction modifier, it depend on the oil. I've run Redline's fluid in the R/E's of many of my vehicles, Mustang GT didn't need it, 1LE Camaro did need it, but less than normally called for, Xterra did not. (all vehicles have/had LSD's)



I previously ran Amsoil 75W140 in my 2500 and I wound up having to add one bottle of modifier (I have a 2wd), I think I should have tried just half a bottle first, but one whole bottle completely eliminated any chatter, in fact, it felt as if it may have been a lil too much.



I'm now switching to LE's 607 and adding modifier on the advise of an experienced salesperson, however I am starting with one bottle and I'll add the 2nd he suggested if it proves to be needed.



So, you deal w/ Goodson?



MaX

 

[TxDieselKid]

Max,

It's the first time the truck has been back to the dealer, so I just started dealing(and what a deal it is) with Goodson yes. I went to Archer on 59Sout, but didn't like their way of talking to me, like I'm some idiot, so I figured I would try them. I bought it from Henson in Madisonville though.



As for the friction modifer, I think I will not add any now, and if it does chatter, then I will add some.



The dealer just called and said, the fluid needed to be changed. I thought about the different service plans, A, and B, and I am not B for sure. Said it was just time to change the fluid. Do I belive him? Nope! It's only $89 to change fluid!?!?!... . lol



Thanks for your help

Andrew

 

[Mad Max]

You've got mail TX...

$89? that's pretty pricey for OEM oil.



MaX

 

[TxDieselKid]

I took my own fluid and they charged me $30 labor. They say it just needed to be changed, but I didn't belive them. If that's what it was, why was it only when I turned?



Got it back at least, just hope they used what I gave them to use.



Andrew

 

[Bob Cochran]

To add or not to add friction modifier. You can have 2 twin trucks with same oil in each. 1 would need some friction modifier and 1 not. It is just because all are slightly diff. in tolerances when built. Moral of story have some friction modifier on hand just in case.



Going straight the the limited slip does nope operate but when turning they do. That is why you turn figure 8's to distribute new oil and see if you have chatter and need to add friction modifier.



You may or may not have needed new oil. It is the first and easiest thing to change, charge for by the dealer.

 

[TxDieselKid]

Thanks for the commits Bob, I'll have to remember that. My thoughts might just be a HUGE dislikeing of the Dealership Service Departments.



Thanks for commiting,

Andrew

 

[RACE427]

Friction Modifier

Go to your Dealer and buy one bottle of friction modifier for $ 5. 00 and pump it into your differential, chattering on turns will be gone. Friction Modifier will not hurt anything inside your differential. It is needed by the limited slip clutches to work properly. Good Luck

 

[TxDieselKid]

The thing is TG, the oil I used said that it had Friction Modifer in it for LSD's. Just more tho think about... .



Andrew

 

[SSchirmers]

rear axel fluid question

I have a ? for anybody. Can you add to much limited slip adative to the rear axel it took 4 bottles to get mine to smooth out with amsoil in the rear end. It took 3 bottles to take care of the chatter when i had mobil 1 in the rear end

 

[Phil Stuart]

LSD additive

I switched over to Amsoil 75w/140 at about 3,500 miles and did the figure eight thing and did not have to add any friction modifier whatsoever. Four bottles seems a bit much,but then again every truck is different.



Phil

 

[RustyJC]

Andrew,



My Dana 80 4. 10LS works fine with the Royal Purple 85W-140 with no supplemental friction modifier required. The friction modifier package formulated into the Royal Purple itself was plenty.



Rusty

 

[Joe Mc]

Capcaity

How many quarts to change out the rear diff. Think it's a Dana 70 non LSD:{ LSD not listed on the options sheet, has 3 54 stamped on the cover tag.