madkaw Posted May 23, 2009 Share Posted May 23, 2009 Well I just got around opening up the LSD I bought. I wasn't real happy to see the ring gear had some pretty bad pitting. Someone let this rear sit around without oil in it -I guess. I paid 700$ for this rear and now i wonder if I will have issues from this pitting. Please look at the pics and let me know what you think. The rear turns very freely and the outer axle bearings looked good. Do you think I will have any problems from this pitting? Quote Link to comment Share on other sites More sharing options...
dan5138 Posted May 23, 2009 Share Posted May 23, 2009 Not something I would run, but I'm kinda picky anyway. Honestly figuring out the gear ratio, and replacing the ring gear would be cheap insurance IMO. Quote Link to comment Share on other sites More sharing options...
RUZN Posted May 23, 2009 Share Posted May 23, 2009 Well Since im doing Drivlelines and Gear Ratio's in school lol. Yes its pitted but yes you can Sand thaat smoother.. As for Gear Ratio it shouldnt be greatly affected as those pits are prolly like 0.0005" deep so that litterally nothing. Best Bet. Sand it up or leave it be it should be fine. those gears can take huge HP so I doubt they will crack or chip. Reasons: Its not dented (causing hardened metal to be pushed up) which eventually stress cracks throughout metal And with normal wear those would be gone in a few weeks to months Quote Link to comment Share on other sites More sharing options...
woldson Posted May 23, 2009 Share Posted May 23, 2009 Run it with royal purple, just for extra insurance. Quote Link to comment Share on other sites More sharing options...
madkaw Posted May 23, 2009 Author Share Posted May 23, 2009 I believe they are worse then .0005, maybe .0010. Do you really think I should sand them? What would be the worst scenerio for this situation? I would have noise or it would cause a stress crack? Quote Link to comment Share on other sites More sharing options...
jt1 Posted May 23, 2009 Share Posted May 23, 2009 I wouldn't sand it. It will run quite a while like it is. I would put some thick oil in it, like 90W, and give it a try. It may or may not have some noise. jt Quote Link to comment Share on other sites More sharing options...
johnc Posted May 23, 2009 Share Posted May 23, 2009 Just run it and start looking for a replacement ring and pinion. It might last a week, a month, or a few years. Quote Link to comment Share on other sites More sharing options...
JMortensen Posted May 23, 2009 Share Posted May 23, 2009 Forget about replacing the ring and pinion, just swap the LSD into another diff if it comes to that. I'd run it. When I sold diff parts for Randy's R&P we had lots of oddball diffs that we had used gears for. Sometimes we'd sell them with light rust or pitting, because the guy just needed gears and couldn't find anything else. Never had a set sent back or complained about. If the pitting isn't really bad I don't think it will make a difference. It's tough to tell from your picture how deep the pits are... Quote Link to comment Share on other sites More sharing options...
madkaw Posted May 23, 2009 Author Share Posted May 23, 2009 I guess I will run it like it is since I sold my other diff I had. In the end it is my fault for not insisting the seller take pics of the inside. If your going to pay this much money for a used part, check it out thoroughly and ask for lot's of pictures. Quote Link to comment Share on other sites More sharing options...
RUZN Posted May 24, 2009 Share Posted May 24, 2009 Yeah it will be fine man seriously. I mean hose things arent totally sand blated and perfect from factory right. They allow for imperfections. only the gears are cut to certain Specs and it isnt like Micro thread Count its HEAVY COURSE hehe Quote Link to comment Share on other sites More sharing options...
HowlerMonkey Posted May 25, 2009 Share Posted May 25, 2009 If the ring is pitted, you might have the same pitting on the pinion bearing. If the car makes a whooshing/hissing noise, then it's the pinion bearing. Quote Link to comment Share on other sites More sharing options...
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