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Driveline Transmissions, Differentials, Axles, Bearings, etc. This forum covers the entire driveline from the Transmission to the wheel bearings!

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Old 06-21-2019, 12:58 AM
chillzone chillzone is offline
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Default Tranny fluid

I have a 2002 Dak with a 5 speed manual transmission. I don't have the owners manual and I can't seem to find what fluid I should use. I read where people said they used 75W90 gear oil and others used Royal Purple Syncromax transmission fluid. Could someone give me some idea what should be used. Thanks in advance.
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Old 06-21-2019, 02:37 AM
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Don't use 75W90. My regular garage changed the oil out on my manual transmission at 130,000 miles and put in 75W90. This was in cooler weather (30 to 50 degrees out), and the transmission was hard to shift, and synchronizers were very stiff until warmed up. I drained it and put in Pennzoil Synchromesh Manual Transmission Fluid (a lighter viscosity than 75W90), and things freed up quickly. I suspect the Royal Purple Syncromax fluid is about the same formulation. See the link for specifications of the Pennzoil fluid.

https://www.pennzoil.com/en_us/produ...2NhbGU9ZW5fdXM
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Old 06-21-2019, 03:08 AM
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Thanks for the info. I'll give that a shot.
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Old 06-30-2019, 08:20 PM
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When I changed the transmission fluid in my 2004 (at approximately 130k miles) I used the MOPAR fluid. It was expensive, about $25 per quart. You only need 2 quarts. I couldn't find an alternate fluid in any of the documentation I had and I wasn't a member of the forum at the time.

The fluid drains fine out the drain, but you need to use a squeeze bottle or transfer pump to get the new fluid in through the (top) inspection hole. Conversely, you could take the shifter off and pour it in from the top.

Take your time and it is a relatively easy job.

https://en.wikipedia.org/wiki/New_Ve...0_transmission
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Old 07-09-2019, 10:44 PM
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Thanks for the info, when I went and looked at the Pennzoil synchromesh, I noticed it was listed as an alternative for the Mopar MTF, but the Synchromesh isn't synthetic and the Mopar fluid is. Would that make a difference? Thanks again.
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Old 07-10-2019, 02:11 PM
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I think the additives are more important than the base fluid (natural or synthetic). The additives are what 'play nice' with the different metals used inside the transmission, and prolong their life. In our transmissions, viscosity is also important for the ease of function of the synchros and gearsets.
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Old 07-10-2019, 11:47 PM
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Personally, I would bite the bullet and use the MOPAR. If you don't intend to drive the truck forever (or don't mind changing the fluid inside 100k miles) the Pennzoil could be okay.

Now when I change engine oil or rear differential, I use Valvoline. That is to say, I am not wedded to only using MOPAR fluids.

I think this is one of those cases where the Pennzoil is *probably* fine, but the Mopar is *certainly* fine.
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