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help with 8ight-t 2.0 rear diff making noise

help with 8ight-t 2.0 rear diff making noise

Old 03-21-2012, 08:13 PM
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Default help with 8ight-t 2.0 rear diff making noise

i have an 8ight-t 2.0 and the rear diff makes a noise when the wheels spin. it sounds like the pinion and gear ring but its not skipping and when i installed it after taking apart the rear diff/rear drive shaft, i pushed the pinion from the inside flush to the inner bearing and mounted the shaft coupler flush with the outer bearing so there is no play. i heard this noise before i re did my diff fluids so i am just trying to find out what is wrong and why its making a noise like someone put a card to a spinning bicycle rim. thanks
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Old 03-21-2012, 08:24 PM
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Originally Posted by jdtwenty6 View Post
i have an 8ight-t 2.0 and the rear diff makes a noise when the wheels spin. it sounds like the pinion and gear ring but its not skipping and when i installed it after taking apart the rear diff/rear drive shaft, i pushed the pinion from the inside flush to the inner bearing and mounted the shaft coupler flush with the outer bearing so there is no play. i heard this noise before i re did my diff fluids so i am just trying to find out what is wrong and why its making a noise like someone put a card to a spinning bicycle rim. thanks
If you're getting a clicking kind of sound, you probably need to replace the ring/pinion gears. They wont look particularly bad but will fail pretty quickly if this is the case.
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Old 03-21-2012, 08:43 PM
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the funny thing is that ill have the diff hooked up to the drive shaft and spin the front wheels and it sounds fine(quiet) but when i throw the shock tower and a arms and tires on, it does it. how can i be sure this is what it is? is this the only thing it can be, i just dont wanna go buy a 40-50 ring gear/pinion set and it still sounds the same.
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Old 03-21-2012, 08:58 PM
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im not sure how true this is but i was told that when it starts making that noise change the diff case and re shim again.
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Old 03-21-2012, 09:12 PM
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anyone else have this noise? i want to race this weekend and i dont know if i will end up breaking down or something.
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Old 03-21-2012, 09:46 PM
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Originally Posted by jdtwenty6 View Post
anyone else have this noise? i want to race this weekend and i dont know if i will end up breaking down or something.
It is definitely the ring and pinion. Replace the gear box/bulkhead, pinion and ring gear, diff case and bearings. Its better to be confident that you won't have a problem.

Make sure to shim the new ring and pinion and check it often.
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Old 03-22-2012, 05:56 AM
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That's standard equipment on the Losi 8T.
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Old 03-22-2012, 07:32 AM
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Still on my 1.0 gear's.
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Old 03-22-2012, 08:23 AM
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All of the above plus when you shim the rear diff, shim it tight as you can without binding.. The sweet spot is you will feel a tight spot and then it will loosen as you revolve it

A good upgrade is the aluminum diff inserts, they will help keep it tight!!
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Old 03-22-2012, 12:49 PM
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Originally Posted by jdtwenty6 View Post
anyone else have this noise? i want to race this weekend and i dont know if i will end up breaking down or something.
Tear it apart and find the problem. I could be shimming, it could be bearings, it could be a old diff case, it could be that the drive shaft is not all the way on the pinion.... The only way to find and fix a issue is to wrench on your ride man.
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Old 03-22-2012, 08:25 PM
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The other noise you could be hearing is the out drive about to seize up in the diff case. Pull it apart and put some hi temp hi pressure grease on the out drives and re assemble.
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Old 03-22-2012, 11:47 PM
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Originally Posted by Greg B View Post
That's standard equipment on the Losi 8T.
Yep.
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Old 03-23-2012, 12:17 AM
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Maybe there is something in the spokes (gears). Take an exacto blade and slide it in each groove of the gears and get all the dirt out. Just an idea.
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