2004 Astro @ 200K miles, any tricks/tweaks for transmission?

2004 Astro @ 200K miles, any tricks/tweaks for transmission?

Postby LAZ 1 [OP] » March 1st 2020, 12:48am

I am planning to get my transmission serviced soon, and with 200K miles on my ASTRO, was wondering if there were any special tricks or tweaks to extend the tranny service life?
Original Poster [OP]
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Re: 2004 Astro @ 200K miles, any tricks/tweaks for transmiss

Postby MmusicmanMmusicman is online! » March 1st 2020, 4:01am

Change the filter, flush the fluid (using only "natural flush" method).. run a cooler.
If fluid still looks good... then the partial fluid change with filter will be more than sufficient.
Not much else you can do... love it, talk to it, read stories to it.. and be thankful for 200K! If you don't abuse or overheat it.. then you may still have plenty of life still to go!

Sidenote: A "Corvette Servo" is an easy and very inexpensive improvement that can bring back some life to an older trans. It is installed in the side of the transmission. I've put them in both my 92 700R4, and my 2000 4L60E. Same part fits both.. cost about $12 online. Boosts hydraulic pressures and restores/improves shift points. Very popular improvement mod.. but not vital.

Corvette servo in my 2000: https://www.astrosafari.com/viewtopic.p ... tart=14698
Corvette servo in my 92: https://www.astrosafari.com/viewtopic.php?f=70&t=115002
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Re: 2004 Astro @ 200K miles, any tricks/tweaks for transmiss

Postby AstroWill » March 2nd 2020, 10:15pm

LAZ 1 wrote:I am planning to get my transmission serviced soon, and with 200K miles on my ASTRO, was wondering if there were any special tricks or tweaks to extend the tranny service life?


A fluid/filter change at proper intervals is always recommended. The newer Dexron VI ATF they have is miles ahead of what came with the transmission originally so that will help. If you travel heavy or tow often an auxiliary cooler is always a good idea. https://sites.google.com/site/astrosafa ... ion-cooler

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Re: 2004 Astro @ 200K miles, any tricks/tweaks for transmiss

Postby LAZ 1 [OP] » July 25th 2020, 7:45pm

Got my trans serviced by my industrial park neighbor, who just happens to be a transmission specialty shop.
There were some "interesting" issues going on ...
in low gear,
taking off from a stop,
seemingly at random,
it felt like the trans wanted to shift, hesitated, then changed its mind.
Felt almost like the G80 LSD slipping.

After a flush and new fluid, all is good.
Apparently the flush was overdue. 320,000 kms = 200 k miles)

So far, in all eight of my A/S vans, I have only had one transmission issue, HARD SHIFT from first to second. A new oversized piston was installed ( $300 Canadian, done with the trans still in the van). In my limited experience, the transmissions seem to be pretty reliable.

BUT,
There are several A/S vans listed for sale locally that need transmissions.
I just bought a LOADED 2000 AWD Astro with no reverse gear for $ 500. Picked up an AWD transmission for another $ 200.
The van is sitting in the yard right now waiting for the trans shop to make some time.

What is the consensus regarding these transmissions?
Reliable?
Fragile?
Original Poster [OP]
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