ZF6 Trans fluid change
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8th Gear
Joined: Jan 2024
Posts: 8
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From: Georgia
ZF6 Trans fluid change
I know this may be a dumb question but I’m not a mechanic. I have 1999 7.3 with a zf6 trans. I have no clue when the trans fluid was changed last, it could have been years. My question- should I change it if it’s shifting fine? I wanna put fresh fluid in it but kinda scared because of all the people that say changing it after years can cause issues. So to change or not to change?
Logistics Pro
Joined: May 2017
Posts: 4,666
Likes: 1,455
From: Muskogee, Ok
If you want to go thru the extra work and risk ripping the white shift boot and the black boot's fragile trim you can add an extra quart thru the top of the shifter. Some claim it's quieter, less gear rollover noise, runs cooler. I didn't really notice a change tho
Cargo Master
Joined: Apr 2022
Posts: 3,190
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Park it on a pretty good side hill with driver side high like in a ditch or soemthing and get the extra quart in through the fill plug.
FTE Leadership Emeritus
Joined: May 2014
Posts: 27,344
Likes: 5,941
From: Lake Hartwell, GA
Loosen or remove the FILL plug before removing the drain plug. This may prevent you from having an oh crap moment if the fill plug is seized in place.
If it is, you can fill from the top as mentioned above if you find yourself in the oh crap zone.
If it is, you can fill from the top as mentioned above if you find yourself in the oh crap zone.
Laughing Gas
Joined: Jun 2017
Posts: 833
Likes: 124
From: CSRA, SC
All transmissions "shift fine" until they're slap worn out. They way to avoid premature wearing out is to perform regular maintenance. If you don't know if it was maintained regularly, it would not hurt to start doing so now!
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