[Shop-talk] modern tranny service

[PJ McGarvey]

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.

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.

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.

________________________________
From: Shop-talk <shop-talk-bounces at autox.team.net> on behalf of John Miller via Shop-talk <shop-talk at autox.team.net>
Sent: Monday, August 5, 2019 4:11 PM
To: shop-talk at autox.team.net <shop-talk at autox.team.net>
Subject: Re: [Shop-talk] modern tranny service

On 8/5/2019 9:41 AM, Tim . via Shop-talk wrote:
> Someone please correct me here since I doubt this is accurate....
>
> I seem to remember reading, years ago, that if an automatic transmission
> has had regular service that it shouldn't be done if the vehicle has a
> lot of miles on it. Something about the new fluid can degrade the seals?

I don't think it's the seals, but a friend who was once an engineer on
the P71 Crown Vic (police) program at Ford once told me that auto trans
life is very simple: drain and fill the transmission pan every 50K.

Don't worry about the torque converter or the filter, just drain and
fill, then do it again the next 50K.  You can drop the pan and do the
filter every so often, but don't obsess about how much you get out or
how you do it, just get new fluid in there regularly.

That's kinda been my model since.

John.
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