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Bad mistake. The heavier oil will wear the chain faster, as the chain runs all the time. Seen it many times in quadratrac jeeps and NP203's in chevy/ford dodges.
Posts by MechBob
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1,678 Posts
How? Higher resistance. It can also hurt other parts inside, especially needle bearings..
Not sure where you get info, but here is some facts-
Early/original Jeep Quadratrac, chain runs all the time, has a "center diff." with limited slip clutches, use a tractor oil, light weight, with friction modifiers. Originally was mineral oil, I think. About the weight of 10w motor oil.
NP203, used in may trucks, many years. Full time AWD, but, also can be positive locked. Has center diff., no clutches. Uses 10-30w motor oil.
NP205, as big and heavy as a 203, but is all "gear to gear. Used in the same trucks as 203,optional. Uses 75-90 gear oil.
all NP and BW (new process/new venture, Borg Warner) that have a chain, use atf-- Except-
The NP used in newer gm's, 99 up astros, and some full size, any that have the electric motor that applies the clutch pack when slipping is measured, use Autotrak II fluid. Which is a very lightweight atf with lots of friction modifiers.
Basically, if it is after 1985, and has a aluminum case, it's a 98% chance it uses ATF.
Now, some of the bigger trucks still use a big, heavy gear to gear case, f500's and up, and such and use gear oil.
Subaru and audi, a "center diff. transfer case, with clutches that can be locked--use ATF.
The bottom line, if it has a chain, it does not use gear oil. Now there maybe an exception out there, but I have not seen it. And I've been working on these things most my life. Right now, sitting in yard, early Quadratrac, np203, np231, BW4472(all AWD astros, 90-98), and a NV136, 99-05 astros,AWD.
Woops, forgot camper truck--NP241
Not sure where you get info, but here is some facts-
Early/original Jeep Quadratrac, chain runs all the time, has a "center diff." with limited slip clutches, use a tractor oil, light weight, with friction modifiers. Originally was mineral oil, I think. About the weight of 10w motor oil.
NP203, used in may trucks, many years. Full time AWD, but, also can be positive locked. Has center diff., no clutches. Uses 10-30w motor oil.
NP205, as big and heavy as a 203, but is all "gear to gear. Used in the same trucks as 203,optional. Uses 75-90 gear oil.
all NP and BW (new process/new venture, Borg Warner) that have a chain, use atf-- Except-
The NP used in newer gm's, 99 up astros, and some full size, any that have the electric motor that applies the clutch pack when slipping is measured, use Autotrak II fluid. Which is a very lightweight atf with lots of friction modifiers.
Basically, if it is after 1985, and has a aluminum case, it's a 98% chance it uses ATF.
Now, some of the bigger trucks still use a big, heavy gear to gear case, f500's and up, and such and use gear oil.
Subaru and audi, a "center diff. transfer case, with clutches that can be locked--use ATF.
The bottom line, if it has a chain, it does not use gear oil. Now there maybe an exception out there, but I have not seen it. And I've been working on these things most my life. Right now, sitting in yard, early Quadratrac, np203, np231, BW4472(all AWD astros, 90-98), and a NV136, 99-05 astros,AWD.
Woops, forgot camper truck--NP241
Joined
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1,678 Posts
You can tell/convince yourself of whatever it takes to help you sleep. Put gear oil in some t/cases and you won't make it 10k miles before catastrophic failure. I guess in your mind, hundreds of thousands of engineers, and millions of hours of testing and real word use are just wrong. Whatever, it's your money. Better be keeping a eye out for a used awd case. Have a nice day.
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1,678 Posts
Try not being disingenuous when you quote. By leaving this out-
"Put gear oil in some t/cases and "
you change the meaning of my statement, and make it seem as if I was directing it at your astro case.
"Put gear oil in some t/cases and you won't make it 10k miles before catastrophic failure."
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