boogaman Posted September 11, 2017 Share Posted September 11, 2017 I have a '99 RD688s with s440 rears ,4.42 ratio. Friday I was loaded and heard some clucking in the drive train and then it just felt like the trans was about to lock up so I threw it in neutral and coasted to a good place dumped my load and got lowboy to haul it to my shop. It's the front rear. After taking the side plate off I could see teeth in the case so I pulled rear out of truck. Can anyone tell me what caused this? And does anyone have a diagram or anything of the breakdown that I could see? Thank you so much for any help. Quote Link to comment https://www.bigmacktrucks.com/topic/50964-front-rear-differential-problems/ Share on other sites More sharing options...
Popular Post Mack Technician Posted September 11, 2017 Popular Post Share Posted September 11, 2017 Shock load, sustain overload, etc. Sleeping crack in gear tooth (teeth) that came to full bloom while driving. Kinda like when you throw your back out lifting a boat trailer tongue, but don't realize it. You sneeze two days later and you feel a "POP" then can't stand up for a week. 3 Quote Link to comment https://www.bigmacktrucks.com/topic/50964-front-rear-differential-problems/#findComment-379401 Share on other sites More sharing options...
Mack Technician Posted September 11, 2017 Share Posted September 11, 2017 (edited) Dump the compartments, remove both wheel hubs, clean wheel bearings, pressure wash banjo, etc. Edited October 3, 2017 by Mack Technician Quote Link to comment https://www.bigmacktrucks.com/topic/50964-front-rear-differential-problems/#findComment-379402 Share on other sites More sharing options...
boogaman Posted September 11, 2017 Author Share Posted September 11, 2017 Thanks for the reply. I've got it pulled out I'll probably tear it down this evening or in the morning. Maybe nothing else wrong just give it a good cleaning.? Replace gears. Quote Link to comment https://www.bigmacktrucks.com/topic/50964-front-rear-differential-problems/#findComment-379403 Share on other sites More sharing options...
Mack Technician Posted September 11, 2017 Share Posted September 11, 2017 You have the techs and specs on it? You install a mated top gear set you need some info on set-up. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/50964-front-rear-differential-problems/#findComment-379404 Share on other sites More sharing options...
Mack Technician Posted September 11, 2017 Share Posted September 11, 2017 (edited) https://macktrucks.vg-emedia.com/InformationListing.aspx?GroupId=407 Books... free downloadable. Edited September 11, 2017 by Mack Technician Quote Link to comment https://www.bigmacktrucks.com/topic/50964-front-rear-differential-problems/#findComment-379406 Share on other sites More sharing options...
boogaman Posted September 12, 2017 Author Share Posted September 12, 2017 Thanks so much 1 Quote Link to comment https://www.bigmacktrucks.com/topic/50964-front-rear-differential-problems/#findComment-379488 Share on other sites More sharing options...
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