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Thoughts on doing a "Trans flush"...

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Old Sep 16, 2011 | 05:20 PM
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Thoughts on doing a "Trans flush"...

My good friend is a mechanic, owns a small shop and he is telling me if the vehicle (any kind...) has over 75K and has never had the trans flushed....he won't do it. My 02 Lariat in my sig has 135K, fluid looks fine but of course i have no idea if it's ever been flushed through as I got it w/ 129K...Whats your opinion? The flush just sounds good to me as it gets all the old stuff out.
 
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Old Sep 16, 2011 | 05:39 PM
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Originally Posted by 4EXTRDR
My good friend is a mechanic, owns a small shop and he is telling me if the vehicle (any kind...) has over 75K and has never had the trans flushed....he won't do it. My 02 Lariat in my sig has 135K, fluid looks fine but of course i have no idea if it's ever been flushed through as I got it w/ 129K...Whats your opinion? The flush just sounds good to me as it gets all the old stuff out.
Is he okay with flushing new transmission fluid? How about the filter? Are old filters better than new ones? I'd take my chance to have fresh fluid and filter.
 
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Old Sep 16, 2011 | 05:41 PM
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Follow this procedure and there will be no problem. Tranny Flush by Mark Kovalsky.
 
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Old Sep 16, 2011 | 06:39 PM
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Payson...I can't get the link to open..weird, check it if u dont mind
 
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Old Sep 16, 2011 | 06:41 PM
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worked for me?
 
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Old Sep 16, 2011 | 06:57 PM
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Got it on another computer...thanks
 
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Old Sep 16, 2011 | 07:16 PM
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homie sez flush it
 
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Old Sep 16, 2011 | 09:23 PM
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I actually agree with your mechanic friend if he is referring to what most consider a "flush" being the removal of fluid and using a flush(detergent). However the procedure Robin posted is more of a fluid exchange, the best way to do a transmission oil change and cleaning in my opinion.
 
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Old Sep 17, 2011 | 12:12 AM
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Originally Posted by BigAlsPSD
I actually agree with your mechanic friend if he is referring to what most consider a "flush" being the removal of fluid and using a flush(detergent). However the procedure Robin posted if more of a fluid exchange, the best way to do a transmission oil change and cleaning in my opinion.
Flush can also mean at a higher pressure than the normal tranny line pressure and that is not a good idea either.

The Kovalsky method also worked on my Nissan and will work on my Jeep. It will most likely work on any auto with an external ATF cooler. Just need to figure out where to open the ATF cooler circulation path.
 
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Old Sep 17, 2011 | 01:50 AM
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I do remember Mark saying it won't work on some of the newer trucks (can't remember the exact years) because the trans cooler only passes coolant once its up to a certain temp. Those trucks need a heated flush to do 100%.
 
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Old Sep 17, 2011 | 02:11 AM
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To me that's like saying "the engine oil shouldn't be changed if it's got over 75k on it" it's just Plain silly! sorry my opinion! Ask him to give you 1 good substantiated reason as to why he would not change the oil, aside from selling a transmission rebuild!
Jim & fat Monty
 
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Old Sep 17, 2011 | 05:10 AM
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Originally Posted by twags6
I do remember Mark saying it won't work on some of the newer trucks (can't remember the exact years) because the trans cooler only passes coolant once its up to a certain temp. Those trucks need a heated flush to do 100%.
The TorqShift (5R110 and 6R140) have thermostats. No 4R100 did, so 2003.25 and newer have thermostats.
 
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Old Sep 17, 2011 | 08:09 AM
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My friend (the mechanic's ) reasoning on his "75K" theory is based on pressures..he did tell me that (possibly screwing up the valve body I would assume) His machine does a fluid-only flush...no detergents. I also don't really agree w/ his theory, why I was getting some input but I do like Mark K's way better as it's natural pressure.
 
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Old Sep 17, 2011 | 09:10 AM
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Originally Posted by Mark Kovalsky
The TorqShift (5R110 and 6R140) have thermostats. No 4R100 did, so 2003.25 and newer have thermostats.


Are you sure about that? When I did the flush on my 03 7.3 X the trans lines were strait in and strait out, easy flush, no problems.
Then when I went to help a buddy with his flush on his 02 7.3 F350 the trans lines had a bypass line between the front and rear lines. I knew right away what this line was for and told him we have to drive the truck around for awhile and get it warm before doing the flush.
 
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Old Sep 17, 2011 | 01:43 PM
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Originally Posted by Snowseeker
Then when I went to help a buddy with his flush on his 02 7.3 F350 the trans lines had a bypass line between the front and rear lines. I knew right away what this line was for and told him we have to drive the truck around for awhile and get it warm before doing the flush.
The bypass on the 4R100 is not controlled by heat but by pressure. To much pressure due to a blockage of some type in the ATF cooler or cooler lines is what operates the bypass valve so ATF will circulate through the tranny.
 
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