BronsonA2150 Posted 3 hours ago Share Posted 3 hours ago Sorry im bombarding this place with questions. I’m brand new to Mack. Changing differential oil in my 94. Discovered you have to drain carrier and axle housing separate. Mack dealer wasn’t much help on quantity it holds so just going until running out check plugs. Want to make sure I’m doing it right. On rear axle I filled axle housing through the check plug and it held about 5.5 gallons. Then filling carrier through vent and when it came out side plug it held about 3-4 gallons. That seems like a %^|{ load of oil and don’t think there was quite that much in it when I drained it all. Is that right? Quote Link to comment https://www.bigmacktrucks.com/topic/75058-oil-quantity-in-differentials/ Share on other sites More sharing options...
Joey Mack Posted 2 hours ago Share Posted 2 hours ago Front diff has 3 sumps, 3 drain plugs... Power divider,,,, top reduction housing, that plug is on the back left side tucked in a hole,,,,, then the bowl. The rear does not have the power divider, but the same other drain plugs.. you fill mack rears from the top down when replacing oil, and only check the level at the rear plug in the axle housing.. banjo housing is another name. 30+ pints in the front,,,, 28 pints in the rear,,,,, 75W90 synth was what was in it, but other grades can be used depending on your climate. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/75058-oil-quantity-in-differentials/#findComment-567370 Share on other sites More sharing options...
BronsonA2150 Posted 2 hours ago Author Share Posted 2 hours ago 22 minutes ago, Joey Mack said: Front diff has 3 sumps, 3 drain plugs... Power divider,,,, top reduction housing, that plug is on the back left side tucked in a hole,,,,, then the bowl. The rear does not have the power divider, but the same other drain plugs.. you fill mack rears from the top down when replacing oil, and only check the level at the rear plug in the axle housing.. banjo housing is another name. 30+ pints in the front,,,, 28 pints in the rear,,,,, 75W90 synth was what was in it, but other grades can be used depending on your climate. Mack dealer did tell me 80-90 in mine. So do I need to drain out and start over? Where do I fill from then? Quote Link to comment https://www.bigmacktrucks.com/topic/75058-oil-quantity-in-differentials/#findComment-567371 Share on other sites More sharing options...
Joey Mack Posted 2 hours ago Share Posted 2 hours ago No. Quote Link to comment https://www.bigmacktrucks.com/topic/75058-oil-quantity-in-differentials/#findComment-567373 Share on other sites More sharing options...
BronsonA2150 Posted 2 hours ago Author Share Posted 2 hours ago 1 minute ago, Joey Mack said: No. Well I’ve got way more than 28 pints in the rear if that’s the total amount needed for the carrier and axle housing for the rear Quote Link to comment https://www.bigmacktrucks.com/topic/75058-oil-quantity-in-differentials/#findComment-567374 Share on other sites More sharing options...
Joey Mack Posted 2 hours ago Share Posted 2 hours ago Just pull the side plug on the side cover, drain it, then the rear plug on the banjo housing.. here is a link for you Quote Link to comment https://www.bigmacktrucks.com/topic/75058-oil-quantity-in-differentials/#findComment-567375 Share on other sites More sharing options...
Joey Mack Posted 2 hours ago Share Posted 2 hours ago https://www.google.com/aclk?sa=l&ai=DChcSEwjs9cCQ24qLAxVZ0OMHHbpjMu4YABAHGgJ5bQ&ae=2&aspm=1&co=1&ase=5&gclid=Cj0KCQiAy8K8BhCZARIsAKJ8sfSj2bKQVpWIQiqtppBk8KhriaUDnn-NbzzuHtYVb0wvtJGkBp38RBEaAoX4EALw_wcB&sig=AOD64_1ksenLV-e4xeTLZqbjEcRTV8hwxA&ctype=5&q=&ved=2ahUKEwixmLiQ24qLAxV1m7AFHQFMCekQwg8oAHoECAMQFQ&nis=7&dct=1&suid=33529432127&ri=26&adurl= Quote Link to comment https://www.bigmacktrucks.com/topic/75058-oil-quantity-in-differentials/#findComment-567376 Share on other sites More sharing options...
Joseph Cummings Posted 2 hours ago Share Posted 2 hours ago Always make sure to clean your vents also. If they get plugged up with dirt you'll have seals leaking like crazy 1 Quote Link to comment https://www.bigmacktrucks.com/topic/75058-oil-quantity-in-differentials/#findComment-567378 Share on other sites More sharing options...
BronsonA2150 Posted 2 hours ago Author Share Posted 2 hours ago 15 minutes ago, Joey Mack said: Just pull the side plug on the side cover, drain it, then the rear plug on the banjo housing.. here is a link for you Thanks. I tried looking for a book the other day but was striking out Quote Link to comment https://www.bigmacktrucks.com/topic/75058-oil-quantity-in-differentials/#findComment-567379 Share on other sites More sharing options...
Joey Mack Posted 2 hours ago Share Posted 2 hours ago So you could see the ad ? Quote Link to comment https://www.bigmacktrucks.com/topic/75058-oil-quantity-in-differentials/#findComment-567380 Share on other sites More sharing options...
Joseph Cummings Posted 1 hour ago Share Posted 1 hour ago I had one company that was always having wheel seal leaks. Turns out they were filling the bottom first and working up. Easy enough mistake to make if you are not familiar with them 1 Quote Link to comment https://www.bigmacktrucks.com/topic/75058-oil-quantity-in-differentials/#findComment-567384 Share on other sites More sharing options...
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