Bluebulldog Posted December 24, 2022 Share Posted December 24, 2022 2000 ch613 with a I believe a 2090 transmission. The one that has the odd shift pattern ( doesn’t use the high gear in low range). What oil should be in it. Servicing the whole truck a was gonna change it. We always had used 80/90 in others but read now that that may not be right. Quote Link to comment https://www.bigmacktrucks.com/topic/70926-2090-transmission-oil/ Share on other sites More sharing options...
Joey Mack Posted December 25, 2022 Share Posted December 25, 2022 75/90 synth.. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/70926-2090-transmission-oil/#findComment-519070 Share on other sites More sharing options...
BOBWhite Posted December 26, 2022 Share Posted December 26, 2022 Do you use that in Mack rears too? Quote Link to comment https://www.bigmacktrucks.com/topic/70926-2090-transmission-oil/#findComment-519074 Share on other sites More sharing options...
Joey Mack Posted December 26, 2022 Share Posted December 26, 2022 Yes... 1 Quote Link to comment https://www.bigmacktrucks.com/topic/70926-2090-transmission-oil/#findComment-519075 Share on other sites More sharing options...
Mackpro Posted December 26, 2022 Share Posted December 26, 2022 https://www.macktrucks.com/-/media/files/body-builder/manuals/heavy-duty/2022/mack-section-1--oil-and-filter.pdf?rev=3fe5689395524824988bae78e9d93183&hash=4A654651964E2CF482A1F80AB207CF46 Link to Mack website that list oil weights for manual trans and carriers 1 Quote Link to comment https://www.bigmacktrucks.com/topic/70926-2090-transmission-oil/#findComment-519095 Share on other sites More sharing options...
Joey Mack Posted December 30, 2022 Share Posted December 30, 2022 If you dont have one of these books for your year model, I suggest you try to get one. They are a wealth of information... Of course Mackpro is also a wealth of knowledge. but.... just in case he's not around, this book will help... 2 Quote Link to comment https://www.bigmacktrucks.com/topic/70926-2090-transmission-oil/#findComment-519374 Share on other sites More sharing options...
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