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Eating Center Diff          OFNA Nitro Talk Back Forum Forum Index -> Ultra MBX Comp Series View previous topic :: View next topic   Author Message mrmas Joined: 13 Apr 2009 Posts: 6 Location: Mobile, Al Posted: Mon Apr 13, 2009 8:05 am    Post subject: Eating Center Diff Hello All, Newbie to Nitro and I recently acquired an MBX Ultra with a Big Block (3.5 I think). Awesome buggy, awesome grunt power. I have one major problem. It is eating center differentials. I am on number 3 now, and probably no more than a half gallon of gas. Any ideas? Back to top Author Message MotionMachine999 Joined: 20 Oct 2005 Posts: 1714 Location: Land of Oz Posted: Mon Apr 13, 2009 9:21 pm    Post subject: Re: Eating Center Diff mrmas wrote: Hello All, Newbie to Nitro and I recently acquired an MBX Ultra with a Big Block (3.5 I think). Awesome buggy, awesome grunt power. I have one major problem. It is eating center differentials. I am on number 3 now, and probably no more than a half gallon of gas. Any ideas? Could you be a bit more specific? What exactly is failing, spur gear, internal spider gears, output shafts, drive cups, other?? Back to top Author Message mrmas Joined: 13 Apr 2009 Posts: 6 Location: Mobile, Al Posted: Tue Apr 14, 2009 5:34 am    Post subject: I guess the internal spider gears. All external components are in good shape. The black is not even worn off the spur gear. Is the internal serviceable? I have just been replacing. I ordered a couple more and they appear to be larger than the ones I have been using. Perhaps the models I have been getting are not strong enough? Input to the spur gear is there, but there is no output. Back to top Author Message DJ Joined: 22 Jun 2006 Posts: 979 Posted: Tue Apr 14, 2009 8:23 am    Post subject: you should be getting part numbers 30769,30779 those are the gears and shims and since you've gone thru this a couple of times the I would suggest in getting a new case it might be warped 30761. Back to top Author Message mrmas Joined: 13 Apr 2009 Posts: 6 Location: Mobile, Al Posted: Tue Apr 14, 2009 11:02 am    Post subject: I bought the whole section, new brakes and all, last time. I got two new ones in the other day. If they don't hold up, where might you recomend I shop for parts. Please PM me if the forum doesn't allow you to recomend vendors. I am guessing form the limited responses, I am getting sub par parts and they cant hold up. Back to top Author Message DJ Joined: 22 Jun 2006 Posts: 979 Posted: Tue Apr 14, 2009 11:10 am    Post subject: Nitrohouse.com Back to top Author Message mrmas Joined: 13 Apr 2009 Posts: 6 Location: Mobile, Al Posted: Tue Apr 14, 2009 11:16 am    Post subject: I looked up those parts and they look pretty stout. Not sure how my car is breaking them. I suspect I am the recipient of bad parts. I am going to disassemble one and take a look tonight. Since I am new to Ofna, I do not know who is a reputable dealer. Any suggestions, as there are none in my area. Back to top Author Message mrmas Joined: 13 Apr 2009 Posts: 6 Location: Mobile, Al Posted: Fri Apr 17, 2009 4:29 am    Post subject: Sometimes a man has to come back to a forum and admit his troubleshooting skills let him down. Grossly let him down. This is one of these times. I changed the center diff last night. Nothing....upon further inspection...one of the dog bone couplers on the rear diff had come loose. Now, how I translated this to the center diff to begin with is beyond me. I swear I was getting nothing to the output shafts off the center diffs...... Anyway a twist of the allen wrench and bam, back in action now. I gave her a rip up and down the street last night...to my neighbors delight The moral of this story is a tube if loctite is a lot cheaper than a center diff... 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