transmission flush at home question - JeepForum.com
 
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post #1 of 9 Old 10-11-2015, 12:26 PM Thread Starter
stumppc
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transmission flush at home question

I plan on changing as much transmission fluid as I can at home on my wife's Jeep. Going to drop the pan, change filter, and install a drain plug. I also plan on trying a DIY transmission flush after that. I've read on this forum about a procedure where you unhook the transmission cooler line, start the jeep, and allow the fluid to pump out while you fill the jeep with ATF4 simultaneously.

Would there be anything wrong with just letting the fluid pump out and refilling it afterwards? I'd fill a bucket that measures the amount pumped out, so I can be sure to fill it with as much as came out.

The perfectionist in me says I need to try and get as much of the old fluid out that I can...

refer to this thread about flush: http://www.jeepforum.com/forum/f96/d...-flush-941569/

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post #2 of 9 Old 10-11-2015, 04:58 PM
ronjenx
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How many miles on the Jeep? Has it had a trans fluid/filter service before? If yes, how many miles ago?

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post #3 of 9 Old 10-11-2015, 05:43 PM
SoK66
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This is more easily done if you have an aftermarket cooler where you can detach the return line. Remove the line from the cooler and put a plug in it. Run a length of tubing from the open port on the cooler into a clear container precisely marked at 2 quarts. Run the engine until the fluid pumped into the container reaches the mark, shut it off. Add two quarts, repeat 7 times. The trans system holds a bit over 13 quarts, so the routine I'm describing will replace virtually all the existing fluid.

The reason you have to stop at two quarts, the trans pump will quit moving fluid at just a bit more that that.

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post #4 of 9 Old 10-12-2015, 09:00 AM
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Quote:
Originally Posted by SoK66 View Post
This is more easily done if you have an aftermarket cooler where you can detach the return line. Remove the line from the cooler and put a plug in it. Run a length of tubing from the open port on the cooler into a clear container precisely marked at 2 quarts. Run the engine until the fluid pumped into the container reaches the mark, shut it off. Add two quarts, repeat 7 times. The trans system holds a bit over 13 quarts, so the routine I'm describing will replace virtually all the existing fluid.

The reason you have to stop at two quarts, the trans pump will quit moving fluid at just a bit more that that.
This is how I have done it, twice now. Considering I am at 108k I probably should do it again, not to mention drop the pan and replace the filter again.

Since we are talking transmission service, anything else that should be done to an auto trans that I am not doing with changing fluids and filters? Should I take it to a professional transmission place for a more thorough service?
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post #5 of 9 Old 10-12-2015, 09:07 AM
SoK66
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Not really much else to do. Droppping the pan and replacing the filter regularly is just a wise precaution. Inspect the pan for unusual stuff that shouldn't be laying there. In general the ATF+4 Mopar uses is stinky stuff that smells burned in the bottle. I flushed mine the first time using the above because I'd run the JK a year since new with no auxiliary trans cooler and the chime had come on a few times. (Later upgraded via the "Hot Oil" light recall.) Figured it would be a good idea to refresh the fluid when I installed the cooler. Repeated again a couple years later.

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post #6 of 9 Old 10-12-2015, 09:18 AM
Amtrack
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In the "good old days" torque converters also had a drain plug to ensure the old and burnt oil was drained out.
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post #7 of 9 Old 10-12-2015, 09:26 AM
SoK66
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Indeed. The process I mentioned above was called a "hillbilly trans flush" by one of the first guys I ever worked for. The point being that dropping the pan didn't get the old stuff out of the torque converter and transmission cooler. The downside is, of course, that you're mixing new fluid with old and there's quite a bit of a diminised return until you've gotten well along in the process.

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post #8 of 9 Old 10-13-2015, 09:10 AM
motoguy1251
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Great reminder, I need to do my manual transmission and transfer case.
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post #9 of 9 Old 10-13-2015, 11:28 AM Thread Starter
stumppc
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Thanks for the input. I am calling this the '2 quart at a time' tranny flush then. My wife's jeep is overdue at 74k miles, but at least it is just used as a mall crawler. I plan on coming up with some kind of pluming fixture then to make this procedure easier in the future.
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