Trans. Fluid Additive?
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More Turbo
Joined: Feb 2004
Posts: 509
Likes: 3
From: Findlay, Il
Trans. Fluid Additive?
My old transmission is wanting to run a little hotter than normal, I think. Is there an additive that I can add, or can I just drain the oil that is in the pan and refill whith synthetic fluid? Or should I go all the way and have a tran shop drain and refill the entire system? '99 PSD, automatic, 792,000 mi.
Post Fiend
Joined: Oct 2003
Posts: 5,903
Likes: 1
From: MICHIGAN
792K miles, Holy crap! You might hold the record for the most miles on this site??
Do you have a trans temp gage? IF so, what is the temp?
Is it shifting OK?
Usually just changing the fluid won't reduce your temps IMO, even switching to SYN won't lower the temps, but SYN ATF can take the heat better than dino oil. A trans shop won't get any more oil out of it than you will. Drain the converter and flush out the cooler(s) will get just about all of oil out of it.
Do you have a trans temp gage? IF so, what is the temp?
Is it shifting OK?
Usually just changing the fluid won't reduce your temps IMO, even switching to SYN won't lower the temps, but SYN ATF can take the heat better than dino oil. A trans shop won't get any more oil out of it than you will. Drain the converter and flush out the cooler(s) will get just about all of oil out of it.
Last edited by Cuda_jim; Apr 8, 2007 at 07:10 AM.
Post Fiend
Joined: Jun 2006
Posts: 5,497
Likes: 7
From: Central, Al
Na older trucks have a drain plug in the TC under the inspection plate. But you dont have to manually drain it the pump will flush it for you
http://www.7point3.com/Writeups/TransFlush.aspx
http://www.7point3.com/Writeups/TransFlush.aspx
Post Fiend
Joined: Mar 2007
Posts: 26,966
Likes: 50
From: Texas
I can't speak for everyone else, but if you've gotten 792,000 miles out of your transmission and engine, I'd say do whatever you think is best. You've obviously done pretty well so far. I'm sitting in the low 200's so I would follow your advice.
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