Comanchekid203 Posted July 30, 2021 Share Posted July 30, 2021 Hey everyone ! New member here , on my second Comanche now ( 89 4.0 4wd auto) I’ve already done plugs, wires , cap and rotor , oil filter housing seals , new oil pan with gasket , new valve cover gasket , tranny service and new tranny lines . Next on the list is flushing diffs and t case , I’m used to the Dana 30s , but the rear end in this truck is a Dana 44 , and I’m honestly not sure what type of fluid to put in it , anyone else have a Dana 44 with some knowledge of this ? Thank you ! Link to comment Share on other sites More sharing options...
rokinn Posted July 30, 2021 Share Posted July 30, 2021 You need to determine whether it is an open diff or a trac lock limited slip (or quite possibly something else). Trac lock LS needs a friction modifier. Should be a tag on the back. If it's not there then you need to open it up and determine what it is. If you open it up take a pic and someone on here can tell you what it is. Link to comment Share on other sites More sharing options...
Pete M Posted July 30, 2021 Share Posted July 30, 2021 I do believe it's straight up 80W-90 gear oil and then add in a friction modifier if it's a posi. Link to comment Share on other sites More sharing options...
MiNi Beast Posted July 30, 2021 Share Posted July 30, 2021 Link to comment Share on other sites More sharing options...
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