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Trans service

Discussion in 'Heavy Duty' started by Derek Powers, Jan 16, 2020.

  1. Derek Powers

    Derek Powers Senior Member

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    2016 2500 6.4 creeping up on 60k miles. Book suggest trans service. What do you suggest? Full service with flush? Just filter and top off fluid?
     
  2. 68PowerWagon

    68PowerWagon Senior Member

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    You probably will get a lot of opinions on this. I am going to do mine here in the next couple of months. I personally am going to do both filters & pump out as much fluid as possible with the tranny pump. There are several youtube videos on how to do this. And if you haven't already, get rid of that thermal bypass valve!
     
  3. Fast69Mopar

    Fast69Mopar Senior Member

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    I wouldn't perform a flush on my lawn mower let alone a trans. Perform the service with a new sump filter and a spin-on cooler return filter and be done.
     
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  4. James L Wren

    James L Wren Junior Member

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    I just did a flush with Amsoil did my transmission and transfer case front and rear diff's. the shop that does my service when they flush it they can tell with the pressure if there is a problem with the filter. I have been doing it for years never any problems. I have found with Amsoil in my transmission it runs 10 deg cooler when towing or plowing.
     
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  5. Derek Powers

    Derek Powers Senior Member

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    Ok...school me on the thermal bypass valve. What is its purpose and how do I get rid of it?
     
  6. 68PowerWagon

    68PowerWagon Senior Member

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    There are a couple of theories as to why FCA put these on our trucks. One being this helps warm up the oil quicker resulting in better fuel economy. The other is it helps the engine warm up faster so it shifts smoother. I have pulled mine & found no difference except my trans temp is 30-40* cooler. When it works & is not sticking, it still reduces oil flow by something like 60-70%. It will be obvious to see why if you remove yours. And then if it does stick you have reduced your oil capacity plus doesn't let oil to flow to the cooler. Do a search on here & you will find where one user has a youtube video of how to replace this. Currently there are two companies producing the bypass. The one I bought (Revmax) has just reduced their price to $99.
     
  7. CVX20

    CVX20 Senior Member

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    Flushing causes more problems than it ever prevented.Replace the filter and as much of the fluid as you can get out(you won't get it all out).If you're real anal drop the fluid again after a few miles to get more of the dirty fluid out.Probably not necessary unless you already have issues.

    Btw Would you guys that do the flush and not the filter,would you change your engine oil and not change the filter?
     
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  8. Blanked

    Blanked Junior Member

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    Drain and fill. Flushing will push the metal shavings back into the transmission . Ask me how I know from other vehicles
     
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  9. 68PowerWagon

    68PowerWagon Senior Member

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    What is the process for doing a "true" flush? Do they add lots of pressure to the system to push all of the fluid & gunk out? I am going to stick with my "generic" flush using the transmission's own pump. Can't see how that would stir up any metal shavings, especially after I have already dropped the pan, cleaned it, & then replaced filters.
     
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  10. Gr8bawana

    Gr8bawana Senior Member

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    Getting rid of the factory thermal by-pass valve is totally unnecessary. Just more internet hogwash.
     

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