Bjt Posted February 14, 2020 Share Posted February 14, 2020 Recently purchased a R686ST that has a Mack T2090 Mack reman transmission. On the passenger side near the bell housing it says, wet clutch only fill with automatic transmission fluid. What reservoir is it referring to? And will appreciate any tips or info on maintenance/dos and don’ts Thanks. Quote Link to comment Share on other sites More sharing options...
Mack Technician Posted February 14, 2020 Share Posted February 14, 2020 IOW- IF this IS a wet clutch, only fill with ATF. Quote Link to comment Share on other sites More sharing options...
terry Posted February 14, 2020 Share Posted February 14, 2020 Is that an actual plug, or where a plug went when they cast the trans. housing? terry Quote Link to comment Share on other sites More sharing options...
fjh Posted February 14, 2020 Share Posted February 14, 2020 That is a provision casting for a wet clutch option which that truck is clearly not equipped the bottom cover has a grease tube hanging out! Quote Link to comment Share on other sites More sharing options...
Maxidyne Posted February 14, 2020 Share Posted February 14, 2020 Kevin probably knows way more about the wet clutch era than I do, but IIRC the Spicer wet clutch was offered as an option by Mack and GMC around the late 60s into the 70s and seemed to have mostly been installed in UPS tractors. By the time I became a peak season UPS feeder driver in the 90s they'd all been converted to dry clutches. Quote Link to comment Share on other sites More sharing options...
Bjt Posted February 14, 2020 Author Share Posted February 14, 2020 Terry It is not a plug, prolly where a plug was supposed to go IF it had a wet clutch lol. I wasn't sure about it which was the reason for asking, the bottom plate and grease tube threw me off, just dbl checking since its my first big truck . Thanks everyone. 1 Quote Link to comment Share on other sites More sharing options...
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