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Cummins12V98

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Posted: 07/26/21 10:10pm Link  |  Quote  |  Print  |  Notify Moderator

Grit dog wrote:

Cummins12V98 wrote:

2015 user guide simply says "Change automatic transmission fluid" or "Change automatic transmission fluid and filter(s)" then goes on to give intervals.

I see nowhere partial fluid change. Common sense tells me it's better to change "ALL" fluid if possible.

People do what you want and I shall also. Funny how it rubs some the wrong way when I suggest changing all if possible.


Yes, you’re right, and yes you’re wrong…
I too prefer the fluid replacement method getting all or nearly all the fluid out and replaced at once. However that is not how the maint intervals are called for on the Aisin. It’s basically half the fluid each time.
Maybe no coincidence that the intervals seem about 2x as frequent as they would seem to be.


If I could figure out how to get it all exchanged I would simply do the service every 60k instead of every 30.

Some day I may call AISIN to see if they can spec a drain plug location in the torque converter.

I had a plug installed on my Turbo 400 at 30k and shifted like new with around 450k when I sold it.


2015 RAM LongHorn 3500 Dually CrewCab 4X4 CUMMINS/AISIN RearAir 385HP/865TQ 4:10's
37,800# GCVWR "Towing Beast"

"HeavyWeight" B&W RVK3600

2016 MobileSuites 39TKSB3 highly "Elited" In the stable

2007.5 Mobile Suites 36 SB3 29,000# Combined SOLD

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