Got a look at the gears inside my NV5600 with PTO cover removed. 36,000 miles on OEM lube, 32,000 miles on Amsoil 5-30 HDD. They are in excellent condition. No visible wear at all. Anyone wanting to see pics, e-mail me and I'll send them to you.
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Engine/Transmission (1998.5 - 2002) NV5600 Gear Condition
- Thread starter Riflesmith
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pic's
Being we seem to want to blow out our chest out over pictures guess i should drain mine tomorrow and snap a shot and challange" amsoil"-- being i don't use it----------------!!!!! and only change out lube every 100k needed or not,no added cooler-/filter system Hype ... over the 3 sisters at 98 deg. 32k plus , passing the big rigs as there were on jackstands ,and all bearings still in place!!!!!! Should up date profile mileage one of these days-------waiting for some one to catch up!!!!
Being we seem to want to blow out our chest out over pictures guess i should drain mine tomorrow and snap a shot and challange" amsoil"-- being i don't use it----------------!!!!! and only change out lube every 100k needed or not,no added cooler-/filter system Hype ... over the 3 sisters at 98 deg. 32k plus , passing the big rigs as there were on jackstands ,and all bearings still in place!!!!!! Should up date profile mileage one of these days-------waiting for some one to catch up!!!!
Well jeeze - not to rain on anyone's parade, but 75-80 thousand miles on a manual TRUCK transmission is hardly worth mentioning! Those things SHOULD do a million miles with decent care and maintenance - synthetic lube or otherwise! The plain 'ol 4 speeds used in my dad's trucks always lasted the entire LIFE of the chassis - and he put over a million miles on a couple of them - with NO transmission repairs/replacements of any kind - and THAT was back in the 50's and 60's... 
What's wrong with my transmission ??
How do you guys get so many mile sout of your trannies.
All I want to do is run 14's in the 1/4, and Tow 36,000 pounds with 400+HP.
I'm running AMSOIL in my transmission, with JB 80 Gear Lube.
My transmission has about 10K on it and is starting to get a *little* noisy. Maybe I should open the PTO covers and see how much metal is in it. ?
Whenever I change the fluid I'll let yall know what I find.
Merrick Cummings Jr
How do you guys get so many mile sout of your trannies.
All I want to do is run 14's in the 1/4, and Tow 36,000 pounds with 400+HP.
I'm running AMSOIL in my transmission, with JB 80 Gear Lube.
My transmission has about 10K on it and is starting to get a *little* noisy. Maybe I should open the PTO covers and see how much metal is in it. ?
Whenever I change the fluid I'll let yall know what I find.
Merrick Cummings Jr
lube
the only reason i posted was that some one seemed to be hype'ing a lube and a change interviel per the book I dont use that brand/or pay 1/4 the cost ++ per the book in 100k how many times should i have changed the lube??????????????$$$$$. and i don't use the mfg's recomended lube
the only reason i posted was that some one seemed to be hype'ing a lube and a change interviel per the book I dont use that brand/or pay 1/4 the cost ++ per the book in 100k how many times should i have changed the lube??????????????$$$$$. and i don't use the mfg's recomended lube
I am not claiming the condition of the gears is due to Amsoil. After all the greater percentage of miles is on the Texaco lube.
The low viscosity called for in these trannies has always made me nervous. Consider the tremendous stress these trucks are capable of putting on drivetrain components. The oil simply seems too thin to prevent metal to metal contact.
I had the Amsoil analyzed after 22,000 miles and it was in overall good condition. It had, however, suffered a viscosity loss from 11. 5 centistokes at 100 deg. C to 7. 7 centistokes at 100 deg. C. This tells me that these gearboxes are tough on lubricant and will shear oil over time.
Not claiming that there is anything remarkable about Amsoil in this application either. Simply sharing my experience with the six-speed and pointing out an alternative to the hard-to-find Texaco lube.
The low viscosity called for in these trannies has always made me nervous. Consider the tremendous stress these trucks are capable of putting on drivetrain components. The oil simply seems too thin to prevent metal to metal contact.
I had the Amsoil analyzed after 22,000 miles and it was in overall good condition. It had, however, suffered a viscosity loss from 11. 5 centistokes at 100 deg. C to 7. 7 centistokes at 100 deg. C. This tells me that these gearboxes are tough on lubricant and will shear oil over time.
Not claiming that there is anything remarkable about Amsoil in this application either. Simply sharing my experience with the six-speed and pointing out an alternative to the hard-to-find Texaco lube.
"I had the Amsoil analyzed after 22,000 miles and it was in overall good condition. It had, however, suffered a viscosity loss from 11. 5 centistokes at 100 deg. C to 7. 7 centistokes at 100 deg. C. This tells me that these gearboxes are tough on lubricant and will shear oil over time. "
HMMMmm - now THAT *is* interesting!
I wouldn't think we would see such a change in a transmission, where there is no combustion and it's byproducts - but primarily shear stresses... Wonder WHY lighter weight lubes are spec'ed fpr later trannies (of SEVERAL brands/types) - if it'd due purely for EPA fuel mileage purposes, rather than reliability and maximum transmission life, I'd sure like to know what's REALLY the best stuff to use for durability and long transmission life...
HMMMmm - now THAT *is* interesting!
I wouldn't think we would see such a change in a transmission, where there is no combustion and it's byproducts - but primarily shear stresses... Wonder WHY lighter weight lubes are spec'ed fpr later trannies (of SEVERAL brands/types) - if it'd due purely for EPA fuel mileage purposes, rather than reliability and maximum transmission life, I'd sure like to know what's REALLY the best stuff to use for durability and long transmission life...
I feel the same way. About a month ago I spoke with about three different technical folks at New Venture Gear about the NV5600 and its lubrication specs. All three told me NVG has never used anything else but the Texaco MTX/STF 1874. I think riflesmith has a good point about changing the fluid FREQUENTLY in these trannies.
"All three told me NVG has never used anything else but the Texaco MTX/STF 1874. "
Being new to these trannies, I'm not familiar with the Texaco stuff mention above, and presumably in my own 6 speed - roughly what are the specs on the stuff - is it lightweight similar to AT fluid, or something with more body to it?
Guess I'll hafta go to Texaco's website to check it out...
Being new to these trannies, I'm not familiar with the Texaco stuff mention above, and presumably in my own 6 speed - roughly what are the specs on the stuff - is it lightweight similar to AT fluid, or something with more body to it?
Guess I'll hafta go to Texaco's website to check it out...
Yes manuals should last forever
clutches on the other hand-- but they're still cheaper than autos and more fun to drive.
I had well over 250K miles on my F-150/Mazda 5-speed before I found out it was supposed to have ATF in it! I was running BG synthetic.
It's still fine after 329K, third clutch.
I've never even seen the gear oil in the box or transfer case of my 1977 F150.
With 49k on the 5600, I figure I've got 50k to find the blue stuff.
clutches on the other hand-- but they're still cheaper than autos and more fun to drive.
I had well over 250K miles on my F-150/Mazda 5-speed before I found out it was supposed to have ATF in it! I was running BG synthetic.
It's still fine after 329K, third clutch.
I've never even seen the gear oil in the box or transfer case of my 1977 F150.
With 49k on the 5600, I figure I've got 50k to find the blue stuff.
Last edited by a moderator:
Thanks for the above pointer - couldn't find it myself on their website... Interesting specs - not real certain as to viscosity ratings in "conventional" terms, due to the way they derive their specs - but it LOOKS like their stuff might be equivelent to a 10-50 weight oil???? Maybe someone with more knowledge as to ratings might chime in...
It's also interesting that they specify excellent EP ratings WITHOUT the usual corrosive effects to brass and other yellow metals in most trannies...
It's also interesting that they specify excellent EP ratings WITHOUT the usual corrosive effects to brass and other yellow metals in most trannies...
I read a spec sheet on the Texaco MTX some time ago. It is very close to 5W-30 engine oil specs. The difference was high temp. viscosity was 10. 8 centistokes at 100 deg. C, making the Texaco lube slightly thinner than the engine oil some are using.
I'm not opposed to going to a good, accepted and fully Cummins-approved synthetic engine oil myself (if there IS such a beast) - but would then adopt a once-a-year change policy, in addition to the use of my Frantz bypass oil filter. I'll probably be putting on somewhere around 10,000 miles a year or less on my new truck, so that would be safe enough, and inexpensive enough in relation to the increased margin of safety the synthetics provide in severe service.
I'd like to do the same in regards to synthetics in the transmission and differential - but too often it's really HARD to separate the truth from the BS as to what is REALLY best and advantageous to use in those applications. I've seen too many instances where fellas have swallowed the BS some makers/users spout about *their* favorite brand of snake oil - only to be sadly disappointed when a failure then occurs, and warranty is denied due to use of non-approved lubricants in that specific application. That happened a LOT in the 6-speed trannies and differentials used in the later Camaros, where use of Dexron AT fluid was clearly specified (in the transmission), but fellas wanted "more protection" from their favorite synthetic - only to then damage the syncros in the transmission due to incompatabilities with the synthetics used...
I'd like to do the same in regards to synthetics in the transmission and differential - but too often it's really HARD to separate the truth from the BS as to what is REALLY best and advantageous to use in those applications. I've seen too many instances where fellas have swallowed the BS some makers/users spout about *their* favorite brand of snake oil - only to be sadly disappointed when a failure then occurs, and warranty is denied due to use of non-approved lubricants in that specific application. That happened a LOT in the 6-speed trannies and differentials used in the later Camaros, where use of Dexron AT fluid was clearly specified (in the transmission), but fellas wanted "more protection" from their favorite synthetic - only to then damage the syncros in the transmission due to incompatabilities with the synthetics used...
Well, actually it would be a NVG (New Venture Gear) approved engine oil. ;-)
Finding just such a thing was the object of my previously mentioned telephone call to NVG about a month ago. No one I spoke with could give me a recommendation as MTX was the only thing they had ever used in the 5600.
jrp
Sorry - I thought you had wandered off topic a bit, and were referring to switching oil you are using in the engine - thus my comments...
At least, it was ENGINE oil *I* was referring to...
At least, it was ENGINE oil *I* was referring to...
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Issue 128 – Digital Version
Digital Magazines
FREE!
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Renew
Subscribe
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Back Issues
Subscription Status
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Buyer's Guides
Ram Diagnostic Trouble Codes
The Perfect Collection
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