WHAT oil in the 6 speed - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 8 (permalink) Old 08-17-2010, 05:06 PM Thread Starter
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WHAT oil in the 6 speed

what oil goes in the 6 speed I have an 02 6 speed 7.3 and a 08 6 speed 6.4
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post #2 of 8 (permalink) Old 08-17-2010, 09:47 PM
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It calls for mercon fluid which has been replaced by mercon V per a tsb, however Im running pennzoils version of the gm synchromesh in mine for the last 100,000 miles (flushed twice now) and It seems to shift smoother. You may also want to get one of those automatic transmission cooler flush kits and flush the cooler lines. When I did mine all kinds of nasty stuff came out the first time.

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post #3 of 8 (permalink) Old 08-20-2010, 08:35 PM
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I use Mobile 1 ATF in mine and no problems.

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post #4 of 8 (permalink) Old 08-20-2010, 09:06 PM
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When you say 6 speed, and 7.3 -- Are you referring to the ZF manual trans?? If so, that would need Gear Oil, and not ATF.
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post #5 of 8 (permalink) Old 08-20-2010, 09:08 PM
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Quote:
Originally Posted by NCfarmboy View Post
When you say 6 speed, and 7.3 -- Are you referring to the ZF manual trans?? If so, that would need Gear Oil, and not ATF.
Incorrect. The ZF6 Transmissions (at least in the 99-02) take synthetic ATF, not gear oil. Although I read somewhere that the later ZF6's (08-10) use a different lubricating oil.

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post #6 of 8 (permalink) Old 08-21-2010, 01:02 AM
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Nope. It's ATF (for the 02)
gear lube for the 08 (GL4)
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post #7 of 8 (permalink) Old 08-23-2010, 01:00 PM
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Cool, you learn something new everyday I guess.
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post #8 of 8 (permalink) Old 08-24-2010, 06:01 AM
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Quote:
Originally Posted by Thundercraft View Post
Nope. It's ATF (for the 02)
gear lube for the 08 (GL4)
ATF throughout the ZF lineage 5 or 6spd, I think it was 08 or so that they started specifying the use of Synthetic and/or regular Merc-V (synthetic for diesel, reg merc v for gasser), but I dont ever recall GL4 or any other type of gear lube. The ZF's have little needle bearings that wont lube well with heavy oil.

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