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Old 04-19-2011, 09:53 PM   #16
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Yes, the outer diff case has far too much room for the bearing to move. I believe it's a necessity to eliminate this.

I use two strips of aluminum tape cut precisely to fit the bearing bed of the outer case. Snugs them up nicely. Two strips should tell you....there's too much room here.
That's a great idea......I would have never thought of that.....
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Old 04-19-2011, 10:13 PM   #17
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After reading this took my front gear case off and discovered this:



About 20 tanks in. Looks like the pinion was carving on the differential casing as you can see. Should i add a shim to my gear shaft? Also should i have greased my gears where it is metal to metal?

The grooves on the gears look fine also.
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Old 04-19-2011, 10:35 PM   #18
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Wow, that looks pretty bad. Does this happen to the mbx6 as well? I took off mine, and found out that my pinion gear does rub against the diff case and leaves pinion teeth marking on it.
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Old 04-19-2011, 10:57 PM   #19
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it looks worse than it is...especially after cleaning it. I am sure it is fine.
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Old 04-19-2011, 11:24 PM   #20
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it looks worse than it is...especially after cleaning it. I am sure it is fine.
I don't drive a Mugen but no vehicle should look like that. So I wouldn't consider it fine.
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Old 04-20-2011, 12:18 AM   #21
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That damage is caused by the bevel gear not being push/flushed with the joint cup.
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Old 04-20-2011, 12:37 AM   #22
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When I take my car apart, I always install my center drive shaft on first to ensure it is as flush as possible on the bevel gear. Then I install my diff into the case.
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Old 04-20-2011, 03:44 AM   #23
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Quote:
Originally Posted by MugenSeikiPro View Post
After reading this took my front gear case off and discovered this:



About 20 tanks in. Looks like the pinion was carving on the differential casing as you can see. Should i add a shim to my gear shaft? Also should i have greased my gears where it is metal to metal?

The grooves on the gears look fine also.
This is because you CVD probably came loose or was mounted with play. If you mount the cvd on the pinions, you need take out the diff and push the pinion on the diffcase and also the centercup. Then tighten the grubscrew. Don't push very hard, just a little so there's no play.

I can see the teehth in my diffscase because I've had a loose CVD in the beginning I drove this car, but not as worse as your diff case.
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Old 04-20-2011, 05:25 AM   #24
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We usually put a diff shim, behind the front bearing of the pinion shaft, then install the pinion shaft, hold the gear of the pinion shaft with my thumb and the center driveshaft universal with 2 fingers, hold then together with pressure, and tighten the set screw on the drivesaft universal. That takes the play out of the pinion and should eliminate what you see in the pictures.
Hope that helps.
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Old 04-20-2011, 09:23 AM   #25
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wow thats pretty bad! my diff case doesnt have any marks in it like that just no teeth on half the ring gear and little nubs on the pinions, both front and rear! they are being sent in to mugen later on this week i ordered new front and rear diffs and pinions ( although i dont think i should have too ) an MSPEC is ready to race and set up out the box. this is like the 4th truck i have seen at my track have this happen too. I love my mugen but durability has always been an issue.
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Old 04-20-2011, 09:34 AM   #26
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wow thats pretty bad! my diff case doesnt have any marks in it like that just no teeth on half the ring gear and little nubs on the pinions, both front and rear! they are being sent in to mugen later on this week i ordered new front and rear diffs and pinions ( although i dont think i should have too ) an MSPEC is ready to race and set up out the box. this is like the 4th truck i have seen at my track have this happen too. I love my mugen but durability has always been an issue.
This isn't m-spec. I bought the kit. For a first timer I would say that the instructions are partly to blame. They are so vague and leave a lot of guessing to finish the job. But durability? You kidding. The Mugen is probably the most durable truggy. This is probably my fault since I built it and the other 3 trucks you seen were probably built as well. I will talk to mugen today
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Old 04-20-2011, 10:23 AM   #27
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You HAVE to HOLD the pinion and universal cup TOGETHER while you tighten the grub screw, or this is what happens!
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Old 04-20-2011, 10:49 AM   #28
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You HAVE to HOLD the pinion and universal cup TOGETHER while you tighten the grub screw, or this is what happens!
Thanks. I just called Mugen and you said the same thing they did Time to take it apart. I shouldn't have to replace it right? Its probably half a millimeter deep groove and the case is a very strong plastic.
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Old 04-20-2011, 11:36 AM   #29
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It's fine. Sand the rough edges off the cup though
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Old 04-20-2011, 05:37 PM   #30
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That's a great idea......I would have never thought of that.....
I put one strip in the bed...then take a bearing and seat the tape really well, generating some heat...then add the other.

There's just enough room for two strips of you rub them in really well....
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