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ATF or SAE 20W |
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gugi55 
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Joined: December-03-2011 Location: Hewitt, NJ Status: Offline Points: 26 |
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 Topic: ATF or SAE 20WPosted: February-07-2012 at 1:07am |
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I am restoring a 74 skier 16' with a 302 Ford. I am changing all the fluids and am trying to decide if I should go with ATF or 20W in the tranny. The 20 W will give it quieter operation and has better lubricating qualities but the ATF is what is recommended(we use 20W in outboard lower units). The ATF is not operating as a power transfer fluid and does not have the same lubricating qualities.
WHY ATF in the first palce .... and comments or words of wisdom! |
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8122pbrainard
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Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41045 |
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Posted: February-07-2012 at 8:01am |
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The ATF is basicaly a 20 weight and is easier to find. There's nothing wrong with using it and would be my first choice. All it's doing is providing hydraulic pressure to the clutch packs. Yes, it does lubricate as well but mostly in reverse when you are spinning the planetary gear set.
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eric lavine
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Joined: August-13-2006 Location: United States Status: Offline Points: 13413 |
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Posted: February-08-2012 at 9:55am |
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and atf is reccommended because it wont foam over 3000 rpms, no problem using motor oil in them in diesel applications
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"the things you own will start to own you"
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eric lavine
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Posted: February-08-2012 at 9:55am |
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atf has anti-foaming agents added
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"the things you own will start to own you"
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8122pbrainard
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Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41045 |
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Posted: February-08-2012 at 10:14am |
Comparing a marine trans to a O/B or I/O lower unit is really a pour comparison. Totally diferent gearing plus, the HP going though the lower unit gears which are always on the small side is very demanding. A lower unit is a gear engineers nightmare!  
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gugi55 wrote: