Tranny fluid and transfer case fluid question?
 

Im converting my truck to a 5speed. and i was just wondering on the fluids. Is there a difference between dexron 2 and dexron 3? And i went by advance to see if they had any manuel tranny fluid, and the computer said to use mobil 1 sys. 75w-90 is that safe to use? Thanks

I wouldnt use the Mobile 1.

The NV4500HD takes a GL-4 fluid. The NV4500HD has carbon fiber synchros and using the wrong fluid will eventually damage them and you will need to tear it down.

The 2 best fluids to use are Castrol Syntorque and Amsoil MTG. http://www.amsoil.com/storefront/mtg.aspx

The Amsoil is about 1/2 the cost or less.


As for your other question - check out Fritz's Dodge Ram Tech - theres all kinds of info there you should familiarize yourself with, including capacities and such.

For the T-case i just put Amsoil ATF in there, and the trans i put full synthetic vavoline 75w-90.

Why would you not put Amsoil in the transmission when you put it in the transfer case?

Its well known that the life of the 5 speed is very much dependent on it getting the proper oil as specified by New Venture.


The Amsoil is not on this list but thats because it came out after this list was issued. The Amsoil MTG does meet the proper spec for this transmission as shown in the amsoil link I posted above


http://www.dodgeram.org/tech/transmi...v4500_spec.htm

I own a transmission shop, and both contain Dexron. There is hardly any difference between the two, other than the three has a higher boiling point than the two does. This means the 3 is a better grade of fluid due in part to it doesn't get hot, and foam as the two might.




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how to replace transfer case fluid

What about +4?

The ATF +4 is what you are supposed to use in a Dodge automatic trans. As for the NV4500, I believe you need 75 w 90 GL5. I have not done mine yet because the trans is out of the truck still broken (hopefully getting to it soon). A friend of mine who has a 4500 was using Redline fluid but had problems. He ended up going to Chrysler and getting the fluid from them, and hasn't had issues since.

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But... I am not saying any of the fluids listed above are incorrect.

It needs a GL-4 fluid. Gl-5s have a higher sulfur content which starts to attack the synchros when the fluid gets hot.

Thank you. That is very good info for me because when I get mine done. I was always under the impression that it was supposed to be GL-5. I'm guessing synthetic will probably be the way to go correct?

If you put +3 in an Auto (vs. putting +4), is it 'hard' on it?
I know it has to do with the boiling point (mostly), so... is it a good idea?

There are several different things being talked about here and hard to keep up.
ATF+3 was discontinued in 05 and replaced with +4. If you have some old fluid still to use in an older than 05 vehicle, you'll be fine in both and auto tranny and tcase. The main difference between the +3 and +4 is the +4 went to using group 3 basestocks(synthetic??) as opposed to mineral based.
Dexron is GM's rating on fluids and really shouldn't matter for this discussion.

The NV4500 does need a GL-4, not GL-5 rated 75/90 gear lube.

For the most part. Synthetics control heat better.(usually) That and the last time I priced it, The Amsoil synthetic fluid was cheaper than the Mopar fluid by a good margin. IIRC The Mopar fluid is The Castrol Syntorque anyways.

I went ahead and bought some amsoil just because it was cheaper. Whats the point of buying fluid that is higher and its pretty much the same thing

Some transmissions shift different with different fluid. My nv5600 actually shifted worse with the amsoil fluid than it did with the mopar fluid.