domonte Posted October 29, 2012 Share Posted October 29, 2012 I bought a Detroit Tru Trac differential for my 12 bolt rear and 3.08 richmond gears; Richmond says nothing but synthetic oil for their gears and Eaton(Detroit) says no synthetic oil for the diff'. frankly I don't know what to do. Has anyone else ever had an issue like this? what should I do? Thanks-Adam P.S. My brother says to use what he calls "magic pot" and go through the nearest salvage yard draining all the rear ends, mix it up and just use that.... I'm not doing that. Quote Link to comment Share on other sites More sharing options...
dbreese Posted October 29, 2012 Share Posted October 29, 2012 I have an eaton tru trac with Motive 3.73 gears. I run Valvoline 80w-90 conventional gear oil. Plenty of miles and passes down the track. No issues. I have run richmonds in the past on conventional oil without any problems. David Quote Link to comment Share on other sites More sharing options...
gprimm Posted October 30, 2012 Share Posted October 30, 2012 A friend worked for Eaton and recommended the Tru Trac for the posit unit. He said conventional only and NO POSI additive. Acts like sand in the Tru Trac. Been in the car for 3 years and 10,000 miles and no issues. Quote Link to comment Share on other sites More sharing options...
badddoin Posted October 31, 2012 Share Posted October 31, 2012 Yeah. Had the same issue. I put an Eaton posi carrier in w/ Richmond Gears. I bought a Richmond installation kit that came with synthetic oil (plus additive) so that's what I used. After the fact, I find a piece of paper that came with the carrier that said not to use synthetic oil. I've only driven it maybe 200 miles since so no tellin' if there's any issues. I'm gonna change it back to regular oil anyways. I want to point my eyeballs in the direction of that open housing just to make sure everything is OK. That's a job I wouldn't mind not doing again. Quote Link to comment Share on other sites More sharing options...
680HPStroker Posted November 1, 2012 Share Posted November 1, 2012 You will get lots of opinions from folks and manufactures will tell you to use this, but don't use that, so who do you trust? I rely on folks that have been building and rebuilding rearends for both the track and the street for many years. Two guys I trust say they have never had any issues with synthetic gear lube and todays high dollar synthetics already have the friction modifier already in it. I bought into the conventional oil only when I had my rearensd put together due to the guy who built my custom carrier kept banging it home to use only Lucas conventional oil. Since getting my axle seals fixed for hopefully the last time I've switched to Royal Purple and I don't anticipate ever having any issues with my rearend. Just my $0.2 Quote Link to comment Share on other sites More sharing options...
domonte Posted November 5, 2012 Author Share Posted November 5, 2012 Thanks for the tips, I'll go with the conventional oil then thanks guys. Quote Link to comment Share on other sites More sharing options...
domonte Posted November 5, 2012 Author Share Posted November 5, 2012 Also I need to get c clips for the axles, I'm not sure which ones to get (or the size thereof) anyone have a tip? Quote Link to comment Share on other sites More sharing options...
dbreese Posted November 5, 2012 Share Posted November 5, 2012 Randy's Ring and Pinion and Moser are two places I can think of right off the top of my head. I'm sure the tech guys can help you out. David Quote Link to comment Share on other sites More sharing options...
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