Change transmission fluid or not? - Ford Powerstroke Diesel Forum
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post #1 of 12 Old 07-19-2009, 05:59 AM Thread Starter
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Change transmission fluid or not?

I purchased a 99 F250 a few weeks ago that now has 180,000 miles. I'm the third owner. The person I purchased from informed me that the transmission fluid has never been changed because he was told that as soon as he changed it, it would cause the transmission to go out. A few of my friends have advised me also not to change for the same reason, is this just a myth or what? They say if the fluid had been changed regularly, yes. Should I have it changed or not? I checked it and looks like it should and smells OK. Thanks!!!

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post #2 of 12 Old 07-19-2009, 06:11 AM
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Dropping the pan and draining the fluid without flushing it wont do any real damage or harm, new fluid is always good, flushing sometimes can do more harm than good. Blow out the cooler lines, drain the tc and drain the pan and refill, you shouldnt dislodge anything in the tranny that is holding it together.

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post #3 of 12 Old 07-19-2009, 06:14 AM
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For sure don't flush it though. Don't ask me how I know!

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post #4 of 12 Old 07-20-2009, 01:07 PM Thread Starter
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Thanks guys, do I need to change the filter? Does Blackstone Labs analyze transmission fluid also?

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post #5 of 12 Old 07-20-2009, 01:16 PM
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if by simply flushing your tranny causes it to fail it was on its last leg to begin with

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post #6 of 12 Old 07-20-2009, 02:09 PM
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flushing tranny is ok, power flushing tranny is bad. flushed many a transmission in my day.....its all about the equipment. some machines force the fluid through, and some allow the trannsmission to suction new fluid in. you dont want to force the fluid through.

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post #7 of 12 Old 07-20-2009, 02:11 PM
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Quote:
Originally Posted by superxcrewfx4 View Post
Dropping the pan and draining the fluid without flushing it wont do any real damage or harm, new fluid is always good, flushing sometimes can do more harm than good. Blow out the cooler lines, drain the tc and drain the pan and refill, you shouldnt dislodge anything in the tranny that is holding it together.
Best advice you could get..
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post #8 of 12 Old 07-21-2009, 06:41 AM
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Best advice you could get..
I second that.



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post #9 of 12 Old 07-21-2009, 07:00 AM
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Originally Posted by superxcrewfx4 View Post
holding it together.
Ha Ha Ha

When I get my reman in I'll be sure to flush it regularly.

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post #10 of 12 Old 07-21-2009, 07:51 AM
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Quote:
Originally Posted by CUMMINS_KILLA99 View Post
if by simply flushing your tranny causes it to fail it was on its last leg to begin with
2nd this.

I would change the fluid using the internal pump. My fathers 00 X when purchased was shifting odd/rough etc. 2 fluid changes and 30K miles later he tows a 30TT with no issues.
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