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Old 03-14-2011, 02:05 AM   #1
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Default help traxxas slash 4x4

Ok so I have a traxxas slash 4x4 that is driving me crazy. It was running like a champ until about two weeks ago, it still runs but any time I give it full or even three fourths throttle it squeals like a banshee.i have a two month old center dif with maybe 10 bashing sessions on it, I have read around about some possible causes, I didn't think it was the gear mesh due to it suddenly starting, but some people had that issue so I remeshed the gears to no avail. I replaced the driveshaft bearing and the motor mount, and even the drive shaft, I'm very frustrated idk what else it could be. any body have any ideas or similar experiences?
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Old 03-14-2011, 02:11 AM   #2
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I'd try to isolate it... have you taken the motor out and just run it standalone?
Does it do it when you just roll the truck without the pinion/spur meshed?

If it does - I'd remove the center driveshaft and see if its in the front or rear.
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Old 03-14-2011, 02:33 AM   #3
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Ok its not the motor, when I roll it with no spur pinion mesh I don't think I am getting it fast enough because it doesn't make the noise. But I did notice that my rear diff seems off, both wheels seem to spin free independently but if you spin one the other doesn't spin by itself like the front difc. but they don't bind when I roll them together. is this normal?
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Old 03-14-2011, 02:34 AM   #4
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slipper loose?
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Old 03-14-2011, 02:35 AM   #5
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No slipper I have a center diff
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Old 03-14-2011, 02:46 AM   #6
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My Slash had a similar squealing noise - it was one of the bearings that held the rear diff. I had to remove the seal/clean/re-lube. Much more quiet now.
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Old 03-14-2011, 02:48 AM   #7
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I literally just put a new one in yesterday, in the rear that's why I am getting so frustrated
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Old 03-14-2011, 02:51 AM   #8
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Actually I just realized there is one that is between the rear and center diff, not the one right by the motor but when you pull the center diff out the bearing that stays in the rear diff opening?
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Old 03-14-2011, 03:02 AM   #9
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how hot does your motor get
might need a new motor , happened to my xcelorin motor.
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Old 03-14-2011, 03:10 AM   #10
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I don't have a temp gun but I do check with my finger hold it on for 3 seconds and it doesn't feel hot. But it makes the noise from the start, I can accelerate on a fresh run and it does it instantly with the motor still ice cold, and once it warms up too.
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Old 03-14-2011, 03:27 AM   #11
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so is it different when its warm or hot?
it will act different if its hot or cold i mean?
if so id say your motor is toast for sure.
only thing that moves and heat effects...
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Old 03-14-2011, 03:42 AM   #12
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It's the same no matter hot warm or cold
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Old 03-14-2011, 05:44 AM   #13
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get a video and upload it to youtube, ill help you from there
easy problem to fix if i had it in front of me
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Old 03-14-2011, 09:47 AM   #14
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Quote:
Originally Posted by And187 View Post
Actually I just realized there is one that is between the rear and center diff, not the one right by the motor but when you pull the center diff out the bearing that stays in the rear diff opening?
yup that's the one - inside the diff case facing the slipper/center diff.
while you're in there, check the output bearings as well left/right of the diff (along with the fluid in the diff itself).
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Old 03-14-2011, 06:58 PM   #15
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The only time mine squeals is when I put a small pionion gear in it. (9 tooth) It does not affect the truck in any way at all, just makes noise.

My only suggestion would be to loosen the motor from the spur gear and run just the motor. If no noise, remove the driveshaft, mesh the pinion and spur, and run the motor and rear-end. If no noise, put driveshaft back in, and run the entire car. This may help you to isolate the area.??

Whenever I took the front and rear diff off my 4x4 slash, there was hardly any grease in them, and I had not run it very much. It was not making any noise though.
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