2018+ Softail Models Breakout

Transmission Fluid Add/Full Difference

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Old May 6, 2024 | 05:35 PM
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Default Transmission Fluid Add/Full Difference

Does anyone know how much transmission fluid is between the ADD and FULLL marks?
2024 Heritage
 

Last edited by Number 6; May 6, 2024 at 05:36 PM.
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Old May 6, 2024 | 06:39 PM
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The manual says the level should be between the add and full marks. You’re good, but if you insist on adding, a couple of ounces should be okay without overfilling.
 

Last edited by GalvTexGuy; May 6, 2024 at 06:42 PM.
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Old May 7, 2024 | 01:24 PM
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Thanks TexGuy, I was at the ADD mark.
 
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Old May 7, 2024 | 02:09 PM
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Originally Posted by Number 6
Does anyone know how much transmission fluid is between the ADD and FULL marks?
2024 Heritage

Judging by the Harley Owners manuals, not even Harley knows how much tranny fluid gets it to the full mark. Much less the amount to go from ADD to FULL. They say add 28 ounces, then fill to between the add/full mark.

I now just dump a quart into the tranny and run it. I check tranny and engine fluids frequently. Only check the primary if the tranny fluid is low. I have not had any transference issue between tranny and primary since adding the primary vent, and only running the quart of fluid.
 
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Old May 10, 2024 | 09:16 AM
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The book says 24 ounces. If checked on the side stand the way the book says, it will barely show on the stick. A full quart shows "full" on the stick, so now I just put in a quart and forget about it.
 
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Old May 11, 2024 | 11:40 AM
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Originally Posted by Uncle G.
The book says 24 ounces. If checked on the side stand the way the book says, it will barely show on the stick. A full quart shows "full" on the stick, so now I just put in a quart and forget about it.
What book says 24 ounces?
 
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Old May 11, 2024 | 12:31 PM
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my 2023 fatboy service manual says 24 oz for trans replacement/fill
 
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Old May 11, 2024 | 12:58 PM
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I wonder what changed? My manual says 28.
 
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Old May 11, 2024 | 12:59 PM
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My 2024 Heritage manual says 28oz for a full load.
 
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Old May 11, 2024 | 02:38 PM
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I don't have a m8, but it is interesting how much fluid changes year to.

I have three tc all have different primary and tranny specs. Something to keep in mind in these threads
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Last edited by Rounders; May 11, 2024 at 02:47 PM.
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