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Old 06-13-2019, 10:25 AM   #1 (permalink)
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trans fluid change intervals

I have a 2013 Duramax and when I purchased it had only 11k on truck and I have 64k on the truck now. I mostly used it for towing fifthwheel 60-70 percent of the time other then that occasional city driving. I'm planning a trip from Michigan to Oregon in august and was wondering if I should change the fluid in transmission. Also I have another question...does GM put in Transyn fluid from the factory. Any help would be appreciated

2013 Duramax LML

Last edited by OkDually; 06-13-2019 at 11:27 AM. Reason: prefix/sig
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Old 06-14-2019, 02:11 AM   #2 (permalink)
Diesel Boss
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a) GM does not put in transynd, at least not through 2015, the factory fill is Dex
b) look at the manual but if your towing IIRC your probably due for a tranny fluid change
c) If you switch to transynd you can easily go another 50K, then drain fill again and go to 100K change intervals. Or drain, fill with transynd, drive a few days, drain and fill and then go to 100K change intervals.

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Old 06-14-2019, 05:06 PM   #3 (permalink)
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One way to get more fluid out with just a one drain and re-fill is to drive the front on blocks.(I use 6" blocks)
If you could let it set overnight (1-2 days would work even better) allowing most of the fluid drain back down from the converter and trans lines.
Then when you remove the drain plug allowing the fluid to drain into a measuring pail, you will get more fluid out letting your truck set longer.

With the pail you'll know the amount of fluid that was removed, but it does take the fun out of guessing how much fluid to put back.

Maybe not quite as much old fluid is removed compared to doing the double drain and refill method, but you do get quite a bit more fluid out this way and less waist of costly transynd..

Refill with transynd and have a safe trip.
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Old 06-14-2019, 07:41 PM   #4 (permalink)
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While my truck was down for head gaskets I removed the trans cooler, upgraded the lines and dropped the pan. It sat long enough that the converter drained down and it has taken about 3.5 gallons to refill.

Also I used Mobil Delvac ATF and its TES 295 approved.
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