Used tranny fluid
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Senior User
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From: Melbourne, Florida
Used tranny fluid
Guy came into a friends shop the other day to show my friend how to use the new tranny power flusher, then asked him what he did with his old tranny fluid. Then he commenced to pour all the old tranny fluid from a 7.3 truck into his main gas tank on his 7.3 and it seemed to run fine, says he does it all the time. Is this normal 
Post Fiend
Joined: Feb 2007
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From: Dallas-Ft. Worth
Maybe you get away with it on a stock truck, changing fuel filters frequently, but I wouldn't do it. I spent way too much on my injectors to risk putting junk from old trans fluid through 'em. Yes, the filter should catch that stuff, but why risk it? Even if it's been pre-filtered, I wouldn't. Too many horror stories out there from folks running "alternative" fuels for my comfort level.
Post Fiend
Joined: Jun 2004
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From: Parker, CO
Guy came into a friends shop the other day to show my friend how to use the new tranny power flusher, then asked him what he did with his old tranny fluid. Then he commenced to pour all the old tranny fluid from a 7.3 truck into his main gas tank on his 7.3 and it seemed to run fine, says he does it all the time. Is this normal
Fleet Mechanic
Joined: Nov 2008
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From: Seattle
Guy came into a friends shop the other day to show my friend how to use the new tranny power flusher, then asked him what he did with his old tranny fluid. Then he commenced to pour all the old tranny fluid from a 7.3 truck into his main gas tank on his 7.3 and it seemed to run fine, says he does it all the time. Is this normal
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More Turbo
Joined: Aug 2008
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From: Frankfort, KY
Heat to 120* and settle the tranny fluid (anybody else bothered by the term "tranny fluid" 
) and then filter the fluid with a 5 micron filter and add to your tank at 1:10 gallons ratio to diesel and then running tranny fluid is fine.
) and then filter the fluid with a 5 micron filter and add to your tank at 1:10 gallons ratio to diesel and then running tranny fluid is fine.
Postmaster
Joined: Jan 2009
Posts: 4,006
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From: AL, Reform
i have seen people run there 7.3 on 100% tranny fluid (started on diesel and cut off on diesel) they filtered it and preheated and had a second filter on it, and it runs great been on it for a a year. the only problem is the junk that is left over is hard to dispose of.
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