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I've only owned one auto-trans car, our 05 Subaru wagon. The manual will tell you that trans fluid is a lifetime fill, and ours doesn't get driven hard or abused, but 50k seems reasonable. It's not like it's hard, especially if you're already doing the oil.
I've done ours twice in 144k.</div>
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One tip is to measure as accurately as possible how much fluid you drain and replace with exactly that much. Checking AT fluid levels is tricky depending on temperature (on Subarus at least) or how level your driveway is, and it's just easier to know how much
to put back in so you don't over or underfill.</div>
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I've replaced the AT filter at the same time, added a magnetic drain plug and dropped the pan once, but I don't think any of that is necessary during each fill. </div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>From:</b> Shop-talk <shop-talk-bounces@autox.team.net> on behalf of John Miller via Shop-talk <shop-talk@autox.team.net><br>
<b>Sent:</b> Monday, August 5, 2019 4:11 PM<br>
<b>To:</b> shop-talk@autox.team.net <shop-talk@autox.team.net><br>
<b>Subject:</b> Re: [Shop-talk] modern tranny service</font>
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<div class="PlainText">On 8/5/2019 9:41 AM, Tim . via Shop-talk wrote:<br>
> Someone please correct me here since I doubt this is accurate....<br>
> <br>
> I seem to remember reading, years ago, that if an automatic transmission <br>
> has had regular service that it shouldn't be done if the vehicle has a <br>
> lot of miles on it. Something about the new fluid can degrade the seals?<br>
<br>
I don't think it's the seals, but a friend who was once an engineer on <br>
the P71 Crown Vic (police) program at Ford once told me that auto trans <br>
life is very simple: drain and fill the transmission pan every 50K.<br>
<br>
Don't worry about the torque converter or the filter, just drain and <br>
fill, then do it again the next 50K. You can drop the pan and do the <br>
filter every so often, but don't obsess about how much you get out or <br>
how you do it, just get new fluid in there regularly.<br>
<br>
That's kinda been my model since.<br>
<br>
John.<br>
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