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Old 05-13-2009, 01:50 PM   #1
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Default TC4: Shredded Ring & Drive Pinion Gear ?!?

Heres a little background on whats going on..

- I have a 5700K mamba w/ 3s Lipo in my Factory Team TC4.
- I blew the rear diff the first day i got it on the road.
- So i went with steel out drives and while i was at it i put a solid spool up front.
- It lasted about a week, the diff trust bolt broke so i rebuilt it.
- I was running foams when it blew again. (couple days ago)

I thought the bolt broke or the bolt came loss. So i decided to also go with a solid spool for the rear. I just took it apart to find the Ring & Drive Pinion Gear shredded!!! See Crappy iPhone picture..



Now, should i replace it with an OEM plastic gear or go with this aftermarket metal gear?
Are there any draw backs from going with metal-to-metal gears?



Opinions would are much appreciated.

Last edited by TomTomTuning; 05-13-2009 at 02:36 PM.
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Old 05-13-2009, 03:04 PM   #2
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Will the metal gears be fine?
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Old 05-13-2009, 03:32 PM   #3
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I had the same problem with my b44(same gears), you should put shims on the outdrives to get the gears closer to gether...
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Old 05-13-2009, 03:41 PM   #4
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Originally Posted by trdsupra88 View Post
I had the same problem with my b44(same gears), you should put shims on the outdrives to get the gears closer to gether...
Another friend told me about the shims...

Should i order this shim kit?
http://67.199.85.166/main/productdetails.php?text=3911

What shim size did you use?
Hmm.. Shimming is new to me so any info would be great.

My LHS has the plastic gears in stock so i'll pick them up tomorrow.
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Old 05-13-2009, 03:46 PM   #5
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don't use the metal gears, it's useless. The tc4 has the strongest shaft drivetrain EVER. Shim it right, take your time to do this. And rebuild you diff, the back spool is the reason why you bevel gear lost its teeth. Never use a solid axle on the rear of a touring car. Handles poorly.

good luck
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Old 05-13-2009, 03:52 PM   #6
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Originally Posted by heretic View Post
don't use the metal gears, it's useless. The tc4 has the strongest shaft drivetrain EVER. Shim it right, take your time to do this. And rebuild you diff, the back spool is the reason why you bevel gear lost its teeth. Never use a solid axle on the rear of a touring car. Handles poorly.

good luck
Thanks!

What about the rear diff caused the gears to shred like that?
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Old 05-13-2009, 05:35 PM   #7
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I have 2 TC4's & i use 1 shim on each of the outdrive bearings . I also use spools up FR as well . I just changed the spool to a slipper spool on both cars to help save the drive drain in case of a hard hit .
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Old 05-13-2009, 06:08 PM   #8
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I have 2 TC4's & i use 1 shim on each of the outdrive bearings . I also use spools up FR as well . I just changed the spool to a slipper spool on both cars to help save the drive drain in case of a hard hit .
Who makes these slipper spools?
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Old 05-13-2009, 06:16 PM   #9
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Quote:
Originally Posted by TomTomTuning View Post
Who makes these slipper spools?
For the TC4 you have to make them. Take the diff balls out, and glue some sandpaper to the diff rings, and put it back together (thrust bearing is normal), and tighten down the diff bolt. What this does is give enough friction for a solid axle on power, but it will give when you hit a board so it helps save drivetrain parts.


Just make sure to shim the diff right and those gears will last a long time
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Old 05-13-2009, 06:28 PM   #10
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Quote:
Originally Posted by geeunit1014 View Post
For the TC4 you have to make them. Take the diff balls out, and glue some sandpaper to the diff rings, and put it back together (thrust bearing is normal), and tighten down the diff bolt. What this does is give enough friction for a solid axle on power, but it will give when you hit a board so it helps save drivetrain parts.


Just make sure to shim the diff right and those gears will last a long time
After i glue sand paper to the diff rings (washer looking things).. Do i put the diff balls back?

Also what side of the Diff ring do i glue the sandpaper on? Both or the side that touches the outdrive?
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Old 05-13-2009, 06:39 PM   #11
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After i glue sand paper to the diff rings (washer looking things).. Do i put the diff balls back?

Also what side of the Diff ring do i glue the sandpaper on? Both or the side that touches the outdrive?
No, the diff balls stay out. The sandpaper goes on the side of the diff rings that would normally touch the diff balls. The paper will take up the space that is lost by the balls, and create a lot of friction for a solid axle, but still have some give, hence the name slipper spool
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Old 05-13-2009, 06:53 PM   #12
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Quote:
Originally Posted by geeunit1014 View Post
No, the diff balls stay out. The sandpaper goes on the side of the diff rings that would normally touch the diff balls. The paper will take up the space that is lost by the balls, and create a lot of friction for a solid axle, but still have some give, hence the name slipper spool
Sweet!!!

What about using Slipper pads from another slipper spool. Would that work to?
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Old 05-13-2009, 07:04 PM   #13
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cardboard paper works fine also to do this. But again this is something you need to do for the front of the car. On the rear : diff and nothing else, everyone will tell you that.

(btw a front spool on a tc4 is something a bit anachronic and the bones are going to suffer A LOT.)

to adjust shimming you can put only one of the two large shims on one side of the diff as suggested, on the side you want. The axle supporting the spur gear should keep its 3 litte shims, but you can place them wherever you want to move the small bevel gear closer or further to the diff gear.

So that's 3X2=6 shimming possibilities to test, to find the spot at which you have no binding and the gears are are close as possible to each other= perfect gear mesh

to have a diff working properly just build it as the manual says : no slipping though easy to rotate by hand .

hope it helps, sorry for my poor english.
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Old 05-13-2009, 07:07 PM   #14
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sorry, 4x2= 8 possibilities for shim placement
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Old 05-13-2009, 07:10 PM   #15
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Thanks so much for the info..

So the rear diff i should not do the sandpaper mod??? And just use the regular diff?


The biggest problem i am having is that the brushless/lipo setup is just so damn powerful.
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