I just bought a used 2003 dually with an 8.1 and allison transmission. I want to swap the fluid over to Transynd. If I change the filter and add the 7.4 qm but what is the current fluid is just the old stuff from the dealer? The truck is 13 years old but only has 89k miles on it so I do not know if it was ever changed or what was used in it if it was changed. Thanks
Change the spin on filter and then do it again in 5000 + miles and they say thats pretty much a complete change to synthetic , expensive but worth it. Madjack diesel has a good price on Transynd
Probably going to do the change again in 5k too like suggested. Basically should end up with 85% transynd or so which is fine for me and what I need. I just want to tow a 3500lb camper and a 900lb atv in the bed. Talk about overkill but I love it!
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