I know on transmissions on other vehicles I've owned, the process to check the fluid level can be quite complicated. Not as simple as just pulling the dipstick like you check your oil. Rather than deal with this when I change my spin on filter, is there any reason not to just collect the fluid that comes out and pour it back in after?
You risk pouring contaminant from the dirty side of the filter back into the transmission.
Better to ignore the small amount lost or figure an amount of new fluid to add.
They hold 7.4 qt (7.0L).
Spin on doesn't hold much. If you'd want to estimate what is removed you could drain what is in the filter into a measuring cup (or whatever) and then add that much fresh fluid + a little bit to make up for what is soaked into filter media.
You might decide that the amount lost with the filter isn't worth worrying about.
If you do want to check the level, the procedure for checking the Allison is in the Diesel supplement.
I just cleaned the magnet filled the little filter with clean fluid. The filter is straight up/down so you can just screw it on and not spill a thing.
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