Hi everybody. Just wanted to get some opinions on what happened to my rear. I have a 1999 Dodge Ram 1500 2WD with 77,000 miles. The rear is a limited slip 3.55. Last year I had my mechanic flush my rear, tranny and power steering fluid. I just did this because the fluids were over ten years old. I used Royal Purple max ATF in the tranny and RP 75-90 gear oil in the rear. I emailed RP and asked if these were okay. They said yes so I bought them. About a week after I had this done I was driving in the city. I made 2 left hand turns and I heard a click after both turns. I thought it was weird, but it went away so I didn't think anything else of it. About four months later I took a right hand turn and heard a pop. After that pop every time my tires went around there was a loud click. I drove it right to my mechanic and he pulled open the rear. All this black burnt fluid came out. What had happened was the cluches in the rear exploded and sent little slivers of metal everywhere into the rear. Everything was marred up including the ring and pinion. So 1500 dollars later I have a brand new rear with regular gear oil in it because I am now afraid to use anything else. My mechanic thinks it was just a coincidence. When he ordered the new rear the women on the phone said that it was very common for dodge rears to blow like this. I'm not so sure though I feel like the RP oil had something to do with it. Does anyone have any experience with this or heard anything? I should also add that this truck was never abused in anyway. It has never even done a burn out.
Does RP owe me a new rear?
- Thread starter silentasknight
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Given that the rear end went 77K miles on the original fluid, I think you'll have a hard time proving that the RP (and not time and wear) caused the failure.
Now, since it is a limited slip diff, did your mechanic also add in a friction modifier (assuming RP doesn't already come with it)?
Now, since it is a limited slip diff, did your mechanic also add in a friction modifier (assuming RP doesn't already come with it)?
I did not add the friction modifier. RP told me it was not needed. Also the original oem fluid came out pretty clear.
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Originally Posted By: silentasknight
I did not add the friction modifier. RP told me it was not needed. Also the original oem fluid came out pretty clear.
If it says in your Owner's Manual that a FRICTION MODIFIER IS NEEDED, then I can see there being a problem here. JMO
I did not add the friction modifier. RP told me it was not needed. Also the original oem fluid came out pretty clear.
If it says in your Owner's Manual that a FRICTION MODIFIER IS NEEDED, then I can see there being a problem here. JMO
RP's fluids already have the friction modifier.
I am not a fan of RP because of it's price I do not think it is any special. But I agree with your mechanic. What did you think was going to happen the OEM fluid was not changed for over 10 years? RP came out black because your rear end exploded.
RP doesn't need anti-slip additive, I ran RP 75W90 in my '02 Ram 3500, Dana 80 rear, NV5600 6 speed, with an oversized Mag-Hytec cover, for around 25K & never saw any trouble with it (fluid looked good when I traded it in).
Originally Posted By: dparm
RP's fluids already have the friction modifier.
Is it the same friction modifier that is sold by Dodge, does Dodge even sell a friction modifier.
I do know that Ford sells a friction modifier.
RP's fluids already have the friction modifier.
Is it the same friction modifier that is sold by Dodge, does Dodge even sell a friction modifier.
I do know that Ford sells a friction modifier.
Known defect with that particular 9.25 Corp LSD...its called a Trac-Loc. This is a very common failure, and not fluid dependent.
I hope they didn't replace the LSD with another LSD of the same type??
I hope they didn't replace the LSD with another LSD of the same type??
If it is a Trac-Loc, made by Eaton, it doesn't have clutches (just like the one I had put in my F-450 Dana 80 last year), Eaton says it doesn't need LS additive because it's a gear type LSD. Sure it's not a conventional LSD? The one in my '02 Ram was a conventional.
Also, I'm watching this with interest because I put RP 75W90 in my wife's xB transaxle a month ago, and I have a brand new Mag-Hytec that I'm going to put on my '06 Ram & I have RP 75W90 lube to put in that one as well. Not sure how that lube could hurt an LSD, though.
If its a clutch/cone type LSD, you add LSD additive AS NEEDED and this is regardless of whether the fluid has it or not.
So, its not RP's fault. I'll blame 'lack of common sense'.
Also, 77k and 10 years is pretty negligent. Blame yourself. 30k/3yrs, whichever comes 1st, is what I recommend for gearboxes.
So, its not RP's fault. I'll blame 'lack of common sense'.
Also, 77k and 10 years is pretty negligent. Blame yourself. 30k/3yrs, whichever comes 1st, is what I recommend for gearboxes.
Unfortunately there's no way to tell what caused your rear to fail. You might be able to find out by having the failed rear (in all its pieces) and the gear oil analyzed by a lab that does forensic analysis, but I can't imagine it'd be worth the time, money, and effort.
Now, say you had ten of the same rear, five of which used RP, and all the ones with RP failed whereas all the ones with other gear oil(s) were fine. THEN you'd have a case against RP. Barring that (or something similar), all you can do is drive on.
Now, say you had ten of the same rear, five of which used RP, and all the ones with RP failed whereas all the ones with other gear oil(s) were fine. THEN you'd have a case against RP. Barring that (or something similar), all you can do is drive on.
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Originally Posted By: dparm
I do know that Ford sells a friction modifier.
Quite right; Ford changed mine at 13,300 in my FX4 and although I had them use the synthetic MC fluid, they still added the modifier.
I do know that Ford sells a friction modifier.
Quite right; Ford changed mine at 13,300 in my FX4 and although I had them use the synthetic MC fluid, they still added the modifier.
Originally Posted By: silentasknight
Hi everybody. Just wanted to get some opinions on what happened to my rear. I have a 1999 Dodge Ram 1500 2WD with 77,000 miles. The rear is a limited slip 3.55. Last year I had my mechanic flush my rear, tranny and power steering fluid. I just did this because the fluids were over ten years old. I used Royal Purple max ATF in the tranny and RP 75-90 gear oil in the rear. I emailed RP and asked if these were okay. They said yes so I bought them. About a week after I had this done I was driving in the city. I made 2 left hand turns and I heard a click after both turns. I thought it was weird, but it went away so I didn't think anything else of it. About four months later I took a right hand turn and heard a pop. After that pop every time my tires went around there was a loud click. I drove it right to my mechanic and he pulled open the rear. All this black burnt fluid came out. What had happened was the cluches in the rear exploded and sent little slivers of metal everywhere into the rear. Everything was marred up including the ring and pinion. So 1500 dollars later I have a brand new rear with regular gear oil in it because I am now afraid to use anything else. My mechanic thinks it was just a coincidence. When he ordered the new rear the women on the phone said that it was very common for dodge rears to blow like this. I'm not so sure though I feel like the RP oil had something to do with it. Does anyone have any experience with this or heard anything? I should also add that this truck was never abused in anyway. It has never even done a burn out.
It is not the RP fluid in anyway behind this. I ran the RP 75W-90 MaxGear in my 94, 97, and 2001 Ram 1500's with the same rear end and it was perfectly fine. Have run RP MaxGear 75W-140 in my 03, 04, and now 08 Ram's too all with excellent results.
No need to add extra friction modifier either as there is already enough in the fluid as a rule. Sometimes they need a little more if it is worn or just a picky LSD unit but generally there is enough in the MaxGear as is for Dodge LSD's.
Lack of timely and proper maintenance, coupled with a known problem, is what happened to you. Wasn't the RP. TONS of people running it in the same vehicle with excellent results.
Now that you have had to rebuild it make sure you take care of it. Change the fluid every 2 years or 30K MAXIMUM. I always did mine at 1 yr/15K just because the Dodge 9.25's are hard on gear oil.
Hi everybody. Just wanted to get some opinions on what happened to my rear. I have a 1999 Dodge Ram 1500 2WD with 77,000 miles. The rear is a limited slip 3.55. Last year I had my mechanic flush my rear, tranny and power steering fluid. I just did this because the fluids were over ten years old. I used Royal Purple max ATF in the tranny and RP 75-90 gear oil in the rear. I emailed RP and asked if these were okay. They said yes so I bought them. About a week after I had this done I was driving in the city. I made 2 left hand turns and I heard a click after both turns. I thought it was weird, but it went away so I didn't think anything else of it. About four months later I took a right hand turn and heard a pop. After that pop every time my tires went around there was a loud click. I drove it right to my mechanic and he pulled open the rear. All this black burnt fluid came out. What had happened was the cluches in the rear exploded and sent little slivers of metal everywhere into the rear. Everything was marred up including the ring and pinion. So 1500 dollars later I have a brand new rear with regular gear oil in it because I am now afraid to use anything else. My mechanic thinks it was just a coincidence. When he ordered the new rear the women on the phone said that it was very common for dodge rears to blow like this. I'm not so sure though I feel like the RP oil had something to do with it. Does anyone have any experience with this or heard anything? I should also add that this truck was never abused in anyway. It has never even done a burn out.
It is not the RP fluid in anyway behind this. I ran the RP 75W-90 MaxGear in my 94, 97, and 2001 Ram 1500's with the same rear end and it was perfectly fine. Have run RP MaxGear 75W-140 in my 03, 04, and now 08 Ram's too all with excellent results.
No need to add extra friction modifier either as there is already enough in the fluid as a rule. Sometimes they need a little more if it is worn or just a picky LSD unit but generally there is enough in the MaxGear as is for Dodge LSD's.
Lack of timely and proper maintenance, coupled with a known problem, is what happened to you. Wasn't the RP. TONS of people running it in the same vehicle with excellent results.
Now that you have had to rebuild it make sure you take care of it. Change the fluid every 2 years or 30K MAXIMUM. I always did mine at 1 yr/15K just because the Dodge 9.25's are hard on gear oil.
Wow I didn't realize that you had to change the other oils so much. I mean changing the motor oil often is a given, but [censored]. Most of the maintenance guides I have seen say to change gear/tranny/diff oil every 75-100K. In my maintenance schedule in the owners manual it does not even tell you to change the gear oil. No wonder so many ppl are buying [censored] cars nowadays, so sad.
More evidence to avoid RP.
MolaKule
Staff member
Does RP owe me a new rear?
Quote:
I just did this because the fluids were over ten years old.
Nope!
Quote:
I just did this because the fluids were over ten years old.
Nope!
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