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4L80e loosing line pressure

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Old May 21, 2026 | 05:59 PM
  #41  
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Originally Posted by MaroonMonsterLS1
The reason I recommended the Allison filter is because its a large truck application so I figured you might be able to more easily source one in your country.
Otherwise, you can find one of Caterpillar equipment or Komatsu or any other big equipment that uses hydraulics.
You're going to want to find something that is around 15 micron and rated to flow around 5gpm or greater...the more the merrier for flow rating.
You can use the Wix Filter Finder to cross reference Caterpillar numbers to get a good idea for flow rating and micron size. WIX does a good job of matching the OE spec.
Thank you! I can see that I have far better local availability on engine oil filters around 20 microns.

Would that be ok since it is not a high pressure hydraulic system or is there a general difference in the filter media etc between a hydraulic and engine oil filter?
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Old May 22, 2026 | 09:45 AM
  #42  
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Typically the trans filters have a different bypass pressure is the main difference.
Really anything that is going to allow that 5+ GPM flowrate will likely be OK, i've got so much access to trans filters here in the states I've never experimented with engine oil filters
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