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Old 12-24-2006, 08:37 PM   #9871
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Ok wondering if someone can help me, just bought a second hand RDX. the rear diff felt VERY gritty, I pulled it apart and regreased the diff balls (talk about bone dry) now when reassembled, no matter how loose or tight the diff is, it's still a bit gritty and I can detect some slip at almost any tension level.

What should I be looking for to fix this?
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Old 12-24-2006, 08:56 PM   #9872
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Quote:
Originally Posted by nexxus
What should I be looking for to fix this?
Check the thrust bearing too.

Change the diff balls and rings.

Does it have the updated bolt with the shoulder?
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Old 12-25-2006, 12:04 AM   #9873
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In addition to the above suggestions, replace the snap ring that holds the thrust bearing in. I believe Specialized RC (Corally USA's aftermarket brand) offers an updated version. A big portion of diff issues can be traced back to a bent or improperly seated snap ring.
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Old 12-25-2006, 12:05 AM   #9874
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Check out this guide on how to build diffs, too, it's excellent.

http://www.corallyusa.com/2005/diffs.htm
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Old 12-25-2006, 06:34 AM   #9875
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Question to all you that have purchased the new style front and rear arms. Has anyone had to file the openings that fit the hubs? I've found that with the hard thickness arms (35)I've had to file the openings to fit the hub. The website said they've got "High precision production and super tight tolerances". I don't mind the extra work but just wondering if I got an old batch or something.
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Old 12-25-2006, 06:36 AM   #9876
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Quote:
Originally Posted by nexxus
Ok wondering if someone can help me, just bought a second hand RDX. the rear diff felt VERY gritty, I pulled it apart and regreased the diff balls (talk about bone dry) now when reassembled, no matter how loose or tight the diff is, it's still a bit gritty and I can detect some slip at almost any tension level.

What should I be looking for to fix this?
The most over looked peice in a diff is the thrust bearing. Replace it! and all problems will be solved!
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Old 12-25-2006, 07:27 AM   #9877
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Quote:
Originally Posted by Electro-MAX RC
Question to all you that have purchased the new style front and rear arms. Has anyone had to file the openings that fit the hubs? I've found that with the hard thickness arms (35)I've had to file the openings to fit the hub. The website said they've got "High precision production and super tight tolerances". I don't mind the extra work but just wondering if I got an old batch or something.
Yep, had to do the same thing. Probably better to have them tighter to begin with, then you don't have to shim the play out.
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Old 12-25-2006, 11:04 AM   #9878
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Quote:
Originally Posted by RC Old Man
The most over looked peice in a diff is the thrust bearing. Replace it! and all problems will be solved!
yeah i just had the same problem with my diff a few days ago. i put in a whole new thrust bearing and it was good as new. the diff would loosen and tighten during runs and feel tight in certian spots while spinning the outdrives. i overlooked thinking that it was the thrust bearing and after rebiulding it twice with the same results i decided to change the thrust bearing and that was the problem all along.

btw.. i just got one of those delrin spools and those things are trick... very nice kudo's to corally..
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Old 12-25-2006, 12:04 PM   #9879
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btw.. i just got one of those delrin spools and those things are trick... very nice kudo's to corally..[/QUOTE]


Nice , but don't use it if your running on a track that's hard on cars. You'll be replacing it quickly.
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Old 12-25-2006, 12:24 PM   #9880
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my track isnt to bad.. why do the outdrives shatter or something?
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Old 12-25-2006, 01:24 PM   #9881
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Jeff,

A nice Xmas present would be an updated Setup Sheet for our RDXs.

Merry Christmas.

Bill
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Old 12-25-2006, 02:51 PM   #9882
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Quote:
Originally Posted by Still Bill
Jeff,

A nice Xmas present would be an updated Setup Sheet for our RDXs.

Merry Christmas.

Bill
Yeah- a rubber tire,low traction setup
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Old 12-26-2006, 06:14 AM   #9883
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Quote:
Originally Posted by outlandr91
Yeah- a rubber tire,low traction setup
If you need rubber setups on asphalt carpet with low med or high traction pm me your email and what kind of setup you need! I'll send the setup sheet to you as fast as i can!

Greetings Ollie
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Old 12-26-2006, 10:16 AM   #9884
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maybee a dum question, but with spool how often do you change the blades?
I drive 4-5, 5minutes race and then it's time to chnage, anybody with the same problem?

Daniel
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Old 12-26-2006, 10:24 AM   #9885
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Quote:
Originally Posted by _RDX_
maybee a dum question, but with spool how often do you change the blades?
I drive 4-5, 5minutes race and then it's time to chnage, anybody with the same problem?

Daniel
With the Alu spool yeah i even drive 2*5min runs because of the mod classe Brushless or 7T motors!
But i drive with the Delrin spool and i drive about 10 or 15 times 5+min and the blades are still good but not optimal!

Greetings Ollie
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