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Old 01-10-2011, 09:51 PM   #1
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Question transmission and t case fluids

i need to change my transmission and t-case fluids what do you guys recommend? or should i just go with the oem stuff thanks

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Old 01-10-2011, 09:57 PM   #2
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ATF+4. Its proprietary by Mopar/Chrysler. Manufacturers have to meet the spec to call their stuff ATF+4. I use Valvoline ATF+4.

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Old 01-11-2011, 12:40 AM   #3
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Auto or manual.
if manual I believe you have a NSG370 6spd which requires special fluid not the ones you can put in AX-5/15's.
tcase just buy ATF+4
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Old 01-11-2011, 07:50 AM   #4
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I am curious to find out the answer to this as well...I think i have the ax-15, 99 4.0 sport. The parts stores all tell me to use gear oil but i know for a fact when i changed the transfercase about 2 years ago when i busted it loose from the tranny that ATF came out it was the pinkish purple color. The fluid wasnt from the transfer case cause it exploded running 75 down the interstate and all fluids from it were left on the side of the road...i have been told there was a miss-print for this in several books. I ask because i followed the advice of the parts store and went with gear oil. However, two months later i had two syncros get ate completely up and now i have to baby my transmission.
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Old 01-11-2011, 09:22 AM   #5
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2005 sport manual np231j t-case thanks
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Old 01-11-2011, 08:47 PM   #6
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syncromesh in the tranny, and atf+4 in the t case
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Old 01-11-2011, 09:45 PM   #7
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ax 15 replace with 10w30 motor oil,atf in np231
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Old 01-11-2011, 10:53 PM   #8
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little help in this area too. 2001 wrangler manual tranny.
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Old 01-11-2011, 11:11 PM   #9
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I sometimes wonder if these vehicle manufacturers have a special engineer whose only job is to figure out different lubricants or coolants for each model just to sell more after-market products and to keep us consumers confused enough that we'll have to go back to the dealer, who generally know even less than we do. Cummins and Caterpillar diesels each have their own antifreeze and matching anti-cavitation additive and neither can be mixed with the other.
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Old 01-12-2011, 12:57 AM   #10
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little help in this area too. 2001 wrangler manual tranny.
NV3550 is between 2003-2004, earlier than that they are all AX-15's for the 6 cylinder.
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Old 01-12-2011, 01:51 PM   #11
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Rockland Standard Gear recommended 10w40 synthetic motor oil for my nsg370 and 10w30 for the 231 TC. (I went with M1 10w30 for both.) I've used it for over a year and it works much better than OEM, Royal Purple, Synchromesh, ATF and ATF+4, and couple of other expensive, specialty fluids. I've also changed it out twice to look for excessive foreign matter and found none. It shifts great and is quieter as well. This was a recommendation that really paid off for me.
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Old 01-12-2011, 03:08 PM   #12
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just call your dealer,ask for parts & tell them you are looking for correct transmission fluid for your vehicle & they will tell you what you need,then go buy at local parts store
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Old 01-12-2011, 03:28 PM   #13
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Crivas19, You should have the nv3550, this is the manual 5speed trans. used after '99. I would recomend using the factory suff, I had a grinding issue into 2nd when trans. was cold and the factory fluid fixed that.
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Old 01-12-2011, 10:31 PM   #14
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I forgot to mention why RSE recommends 10w30 synthetic in the transfer case. According to them, ATF+4 is an excellent lubricant, however over time it tends to "mist" and disappear out the vent tube. This case will not tolerate low fluid levels at any time. They tested 10w30 as a replacement and found that it will not evaporate or mist out and lubricates as well as ATF+4.

I have a list of TC's they recommended this with. Any TC that has a hydraulic pump cannot use engine oil, and it should not be considered. The NP-231 and NP-242 cases found in many jeeps do not have fluid pumps, and both can use 10w30 successfully.

I know that DC now specs 10w30 engine oil for AX-15 transmissions as well. NSG-370's are still spec'd for OEM fluid, however I've used 10w30 synthetic engine oil in mine for about 2 years now with excellent results.

When in doubt, go with OEM fluid. I found OEM fluid and all aftermarket transmission fluid performance to be totally unacceptable and thus found excellent alternatives. A little research pays off nicely.
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Old 01-12-2011, 11:33 PM   #15
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NV3550 is between 2003-2004, earlier than that they are all AX-15's for the 6 cylinder.
AX 15's were used up until '99. 2000 thru 2004 are NV3550
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Old 01-13-2011, 01:23 AM   #16
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I forgot to mention why RSE recommends 10w30 synthetic in the transfer case. According to them, ATF+4 is an excellent lubricant, however over time it tends to "mist" and disappear out the vent tube. This case will not tolerate low fluid levels at any time. They tested 10w30 as a replacement and found that it will not evaporate or mist out and lubricates as well as ATF+4.

I have a list of TC's they recommended this with. Any TC that has a hydraulic pump cannot use engine oil, and it should not be considered. The NP-231 and NP-242 cases found in many jeeps do not have fluid pumps, and both can use 10w30 successfully.

I know that DC now specs 10w30 engine oil for AX-15 transmissions as well. NSG-370's are still spec'd for OEM fluid, however I've used 10w30 synthetic engine oil in mine for about 2 years now with excellent results.

When in doubt, go with OEM fluid. I found OEM fluid and all aftermarket transmission fluid performance to be totally unacceptable and thus found excellent alternatives. A little research pays off nicely.
Chain driven transfer cases like the 231 and 242 require ATF. Gear driven transfer cases like the 300 require gear lube.

Regarding the use of ATF in manual transmissions... they don't use ATF in manual transmissions any more. They tried it for several years and determined ATF did not have sufficient shear strength for the gears and went back to gear lube. Yes some manuals that base their specs on that period of time may still indicate ATF but ATF was never a good choice for manual transmissions. ATF was tried, found wanting, and discarded as a suitable lube for manual transmissions.

And not many report anything but dissatisfaction using GM or Penzoil Synchromesh in their NV3550 transmissions given enough time. Technically, it meets the NV3550's specs but that transmission doesn't seem to do well long-term with Synchromesh.
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Old 01-13-2011, 10:42 AM   #17
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[QUOTE=JD Adams
I have a list of TC's they recommended this with. Any TC that has a hydraulic pump cannot use engine oil, and it should not be considered. The NP-231 and NP-242 cases found in many jeeps do not have fluid pumps, and both can use 10w30 successfully.
.[/QUOTE]

this is false info, the jeep 231 has an oil pump, so it wont work then according to this info, when doing a sye , you have to make sure the pump tube doesnt come out of the pump,
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Old 01-13-2011, 10:53 AM   #18
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royal purple

Im flushing my trans (auto) and t case this weekend and replacing with Royal purple
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Old 01-13-2011, 11:47 AM   #19
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I forgot to mention why RSE recommends 10w30 synthetic in the transfer case. According to them, ATF+4 is an excellent lubricant, however over time it tends to "mist" and disappear out the vent tube. When in doubt, go with OEM fluid. I found OEM fluid and all aftermarket transmission fluid performance to be totally unacceptable and thus found excellent alternatives. .
I think I'll stick to New Ventures recommended ATF+4 and check my TC fluid level on occasion if it's prone to "misting out".

As far as "I found OEM fluid..performance to be totally unacceptable"...
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Old 01-13-2011, 04:16 PM   #20
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Thanks tokkie and others. will have to go get some of the NV3550
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Old 01-13-2011, 06:15 PM   #21
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Im flushing my trans (auto) and t case this weekend and replacing with Royal purple
Just make sure it is ATF+4. Personally I really like Valvoline's Synthetic ATF+4.
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Old 01-13-2011, 09:16 PM   #22
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this is false info, the jeep 231 has an oil pump, so it wont work then according to this info, when doing a sye , you have to make sure the pump tube doesnt come out of the pump,
The NP-231 does not use a hydraulic pump as a part of the case design. I have a complete, exploded-diagram of the entire unit if you would like to take a look for yourself.

Also, if you message me for this .pdf file, use complete sentences, proper grammer and syntax.
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Old 01-13-2011, 09:18 PM   #23
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[QUOTE=pokey;986704]I think I'll stick to New Ventures recommended ATF+4 and check my TC fluid level on occasion if it's prone to "misting out".

AFT+4 works fine and I recommend you use it, so long as you check the fluid level at least yearly. You'd be surprised how many people never bother.
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Old 01-13-2011, 09:18 PM   #24
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The NP-231 does not use a hydraulic pump as a part of the case design. I have a complete, exploded-diagram of the entire unit if you would like to take a look for yourself.
You may looked at a diagram once but others of us have actually worked on them and both the 231 and 242 transfer cases do indeed have an oil pump.

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Old 02-13-2011, 09:57 AM   #25
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Old 02-13-2011, 11:26 AM   #26
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Is what really true?
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Old 02-13-2011, 11:32 AM   #27
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Is what really true?
" It uses a 10W30 or automatic transmission fluid weight manual transmission fluid. " if so which one can i use 10w30 synthetic ( i am a big fan of mobil 1 synthetic oils ) or atf+4 thanks
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Old 02-13-2011, 11:41 AM   #28
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I would be inclined to believe 10W-30 is ok for the NGS370 but I personally would not use ATF in any manual transmission. Manufacturers experimented with using ATF in manual transmissions years ago but discovered ATF did not have sufficient shear strength and went back to gear lube. Some old manuals from that era still specify ATF for certain manual transmissions but such information is outdated.
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Old 02-13-2011, 12:01 PM   #29
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i would go with the royal purple since people has good reviews about it but i don't have any around here that i can pick up so i would just go with 10w30 mobil 1 fully synthetic can i use the extended performance too? thanks

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