diff oil in dodge
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Are you sure that isn't the first change (for break-in purposes) interval? Maybe subsequent intervals are longer?
My dad's Ram had more than 100,000 miles on his diff before changing the fluid out recently. Fluid looked horrible but it would probably have even lasted longer than that.
Planning on doing a siphon through the fill plug every 30k.
Planning on doing a siphon through the fill plug every 30k.
I did the first change at 15k, should of done it sooner. After that I did a 30k interval with Amsoil severe gear, fluid looked very clean. Coming up on the next interval at 40-50k with a uoa. If doing severe towing, over 10k on a regular basis I would change it more often or UOA and find out the condition of the oil.
If you read it a little closer, there are two schedules...one is a 15k OCI severe duty schedule, the other I'm not sure there is an OCI for the rears.
Take this for what its worth...the factory fluid is pretty much garbage IMHO...it needs drained before 15k. I ran Mobile 1 for 25k, and it was in bad shape when I drained it (turned brown and smelled burnt).
I have since changed to RP 85w140, and have since put over 100k on this fill alone, but I do have an aluminum cover and 9 quart capacity....even picked up some mileage changing from the 75w90 to the RP85w140.
Take this for what its worth...the factory fluid is pretty much garbage IMHO...it needs drained before 15k. I ran Mobile 1 for 25k, and it was in bad shape when I drained it (turned brown and smelled burnt).
I have since changed to RP 85w140, and have since put over 100k on this fill alone, but I do have an aluminum cover and 9 quart capacity....even picked up some mileage changing from the 75w90 to the RP85w140.
I just changed mine at about 30,000 miles the first time. Switched to schaeffer's 75w-90 syn. and did the x-fer case also with schaeffer's atf+4 syn. I will do the trans at 50,000 miles which will be another 10,000 miles. I will prolly do the diffs. once a year from now on. I drive about 40,000 to 50,000 miles a year.
The rear diff drain interval listed by Dodge should not be ignored. Notice how tow ratings and engine outputs have skyrocketed in the last decade? Diff sizes and strengths have not increased in proportion. The diffs are now under vastly higher stress than they were, and the fluid is being 'used up' in the process. You could reasonably go much longer than 15k on the front diff if you're always running in 2WD.
what are the signs of a failing diff? will it give warning or will it leave you stranded?
Its their #167 all-trans product, ram. It is a full synthetic even though the site shows synth blend..
I can't remember the number, I know it said syn. on the 55 gal drum my guy used.
Originally Posted By: bulwnkl
The rear diff drain interval listed by Dodge should not be ignored. Notice how tow ratings and engine outputs have skyrocketed in the last decade? Diff sizes and strengths have not increased in proportion. The diffs are now under vastly higher stress than they were, and the fluid is being 'used up' in the process. You could reasonably go much longer than 15k on the front diff if you're always running in 2WD.
This would also depend on the *use* of the truck...is one used as a grocery getter really stressing gear oil?
And it has more to do with the fact they spec 75w90 and not a better gear oil...they are more concerned with mileage (cafe numbers) than wear. There are lots of us running a lot more than 15k intervals without a hitch...
And to add, there are guys running 500+HP through these same trucks (far cry from stock) and they have zero issues for a lot of miles. What is the difference between a light truck pulling 12k or a HD truck pulling 80k, they're still stressing the gear oil.
And again, there are TWO schedules...and IMHO, unless you are towing commercially you are SCHEDULE "A", which has no set change interval!!!
The rear diff drain interval listed by Dodge should not be ignored. Notice how tow ratings and engine outputs have skyrocketed in the last decade? Diff sizes and strengths have not increased in proportion. The diffs are now under vastly higher stress than they were, and the fluid is being 'used up' in the process. You could reasonably go much longer than 15k on the front diff if you're always running in 2WD.
This would also depend on the *use* of the truck...is one used as a grocery getter really stressing gear oil?
And it has more to do with the fact they spec 75w90 and not a better gear oil...they are more concerned with mileage (cafe numbers) than wear. There are lots of us running a lot more than 15k intervals without a hitch...
And to add, there are guys running 500+HP through these same trucks (far cry from stock) and they have zero issues for a lot of miles. What is the difference between a light truck pulling 12k or a HD truck pulling 80k, they're still stressing the gear oil.
And again, there are TWO schedules...and IMHO, unless you are towing commercially you are SCHEDULE "A", which has no set change interval!!!
Originally Posted By: byez
what are the signs of a failing diff? will it give warning or will it leave you stranded?
Typically, you'll start to get a whine or growl that will just get worse and worse...typically they don't leave you stranded.
what are the signs of a failing diff? will it give warning or will it leave you stranded?
Typically, you'll start to get a whine or growl that will just get worse and worse...typically they don't leave you stranded.
Originally Posted By: deeter16317
Originally Posted By: byez
what are the signs of a failing diff? will it give warning or will it leave you stranded?
Typically, you'll start to get a whine or growl that will just get worse and worse...typically they don't leave you stranded.
Pretty much how my Dana 30 died in my Volvo Turbo. And ugly noise. Filled with........75W-140................Redline.
Originally Posted By: byez
what are the signs of a failing diff? will it give warning or will it leave you stranded?
Typically, you'll start to get a whine or growl that will just get worse and worse...typically they don't leave you stranded.
Pretty much how my Dana 30 died in my Volvo Turbo. And ugly noise. Filled with........75W-140................Redline.
Originally Posted By: deeter16317
This would also depend on the *use* of the truck...is one used as a grocery getter really stressing gear oil?
You're leaving off the all-important design of the diff. If it's designed as a grocery-getter (which is what most pickups are), then yes grocery-getting is stressing the oil. Your posted experience supports this notion.
Originally Posted By: deeter16317
And it has more to do with the fact they spec 75w90 and not a better gear oil
There's nothing in the world that's not 'better' about a synthetic 75W-90. Perhaps you've been using the wrong word? Perhaps you mean a more viscous gear oil, but you're incorrectly saying 'better?'
Originally Posted By: deeter16317
And to add, there are guys running 500+HP through these same trucks (far cry from stock) and they have zero issues for a lot of miles.
You mean there are guys with 500+hp engines in their pickups? That's not even similar to running 500+hp through the diffs normally (i.e. more often than not). Did you neglect to mention that they're not running the specified 75W-90 gear oil grade? Did you neglect to mention anything about their higher-capacity diff covers with cooling fins on them?
If you're talking about running non-spec fluids with non-spec hardware, that's perfectly fine. Just try to be clear about what you mean so that the O.P. can judge whether your 'claims' are comparable to what he's looking at and for or not.
This would also depend on the *use* of the truck...is one used as a grocery getter really stressing gear oil?
You're leaving off the all-important design of the diff. If it's designed as a grocery-getter (which is what most pickups are), then yes grocery-getting is stressing the oil. Your posted experience supports this notion.
Originally Posted By: deeter16317
And it has more to do with the fact they spec 75w90 and not a better gear oil
There's nothing in the world that's not 'better' about a synthetic 75W-90. Perhaps you've been using the wrong word? Perhaps you mean a more viscous gear oil, but you're incorrectly saying 'better?'
Originally Posted By: deeter16317
And to add, there are guys running 500+HP through these same trucks (far cry from stock) and they have zero issues for a lot of miles.
You mean there are guys with 500+hp engines in their pickups? That's not even similar to running 500+hp through the diffs normally (i.e. more often than not). Did you neglect to mention that they're not running the specified 75W-90 gear oil grade? Did you neglect to mention anything about their higher-capacity diff covers with cooling fins on them?
If you're talking about running non-spec fluids with non-spec hardware, that's perfectly fine. Just try to be clear about what you mean so that the O.P. can judge whether your 'claims' are comparable to what he's looking at and for or not.
Originally Posted By: Onmo'Eegusee
Its their #167 all-trans product, ram. It is a full synthetic even though the site shows synth blend..
Could you clarify some more? 167 is a Schaeffer gear lube, not an ATF. There is indeed no ATF+4 listed on their website, though the data sheet for 204SAT recommends it for use in ATF+3 and ATF+4 applications. Is that the one you mean?
Its their #167 all-trans product, ram. It is a full synthetic even though the site shows synth blend..
Could you clarify some more? 167 is a Schaeffer gear lube, not an ATF. There is indeed no ATF+4 listed on their website, though the data sheet for 204SAT recommends it for use in ATF+3 and ATF+4 applications. Is that the one you mean?
Extra HP is not always harder on the rear end. If you are trying to tow way more than the truck is rated for just because you have got more HP then yes it's going to eventually get your rear end as well as your tranny, clutch if you have one, and drive shafts. And if so changing the best gear oil in the world at 50 mile intervals isn't going to keep yor diff intact.
Originally Posted By: ram
And if so changing the best gear oil in the world at 50 mile intervals isn't going to keep yor diff intact.
Then why did YOU ask the question??? If you already know the answers??
And if so changing the best gear oil in the world at 50 mile intervals isn't going to keep yor diff intact.
Then why did YOU ask the question??? If you already know the answers??
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