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/70927-2090-transmission-oil/ Share on other sites More sharing options...
Joey Mack Posted December 25, 2022 Share Posted December 25, 2022 Mack tranny's since the mid. 90's took 75W90 synth. From the factory.. Do you have a Maint. And Lube book? There should be other grade listings for the region and usage.. Quote Link to comment https://www.bigmacktrucks.com/topic/70927-2090-transmission-oil/#findComment-519032 Share on other sites More sharing options...
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