Does changing burnt c5 transmission fluid make an overheating tranny worse? - Ranger-Forums - The Ultimate Ford Ranger Resource


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Old 04-24-2015
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Icon5 Does changing burnt c5 transmission fluid make an overheating tranny worse?

I busted a coolant line for my c5 tranny in my 84 ranger 4x4. It overheated and burned up the fluid. I repaired the line and have only driven about 45 miles since then. The fluid is dark and thick and I wanted to have it drained and replaced. The desk guy at aamco told me that doing this will make the overheating and slipping while hot worse and that I shouldn't proceed. I know it needs new plates and bands because it is old and weak and hasn't been serviced since I bought it 4 years ago. I just did a lot of engine and drivetrain rebuild work and the tranny just isn't up to snuff with the new hp. My question is; Is this desk guy full of ****? Should I change out the varnished fluid and go until I can rebuild? Or will doing this make my problem worse?

Also, I didn't have any issues w overheating until after the coolant line came off. Does this mean anything? Clogged filter, Maybe?

Last edited by WillMitchell; 04-24-2015 at 09:52 AM.
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Old 04-25-2015
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the transmission guy is correct

as you clearly stated yourself , the transmission is in dire need of a rebuild

changing out burnt fluid for fresh fluid will in fact make the transmission worse off
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Old 06-29-2015
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if it was me i would change the oil because oil like that will not shift or lube properly. i cant see how oil with contaminants and metal filings in it will help your transmission last longer. the filter is probably plugged too. transmission oil should be changed every 2 years. suggest mobil 1 synthetic if compatible. do not flush just change what is in the pan. good luck

Last edited by bjurke; 06-29-2015 at 04:31 AM. Reason: inaccurate
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Old 06-29-2015
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Don't only change the oil but have the tranny flushed and the filter cleaned. As per burke above, leaving that burt crap in there sonly going to accelerate wear and ultimately a catastrophic failure which means you'll probably be looking for a new tranny versus being able to rebuild your. Best of luck.
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