Tmaxx drivetrain problem - RCCanada - Canada Radio Controlled Hobby Forum
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Old 09-25-2008, 09:29 PM   #1
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Tmaxx drivetrain problem

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Well here it goes. When i give it power, the front wheels get full/more power than the rear wheels. The rears don't spin as fast which causes the truck to almost hop/bounce initially since the fronts break traction instantly and the rears are not moving as fast. Also it doesn't have the speed as it once did when it does get going.

Its not a loose wheel which is spinning off the hub, I checked that already.

Also I noticed when I spin the wheels when they are off the ground the two fronts and one rear wheel experience less friction when coming to a stop than the other rear wheel which will stop spinning a bit sooner.

diff problem or tranny?

help in diagnosing this problem greatly is appreciated!
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Old 09-25-2008, 10:01 PM   #2
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I had that exact same problem once w/ my HPI MT2 and it turned out to be a missing set screw on the rear driveshaft. So basically that driveshaft was just spinning w/o turning the rear gearbox. Good luck!
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Old 09-26-2008, 05:55 AM   #3
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sounds like your rear inner diff cup has spun off the ring gear. Tear it down and replace the inner diff cup and while it is apart you might as well shim it and replace the bearings
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Old 09-26-2008, 09:21 AM   #4
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Thanks, I will check the diff. Sorry I'm a complete newbie... but what is shimming and how do I do it?

Thank you

edit, ok did some reading, so shimming will take out the excess play in the gears so that they mesh more tightly therefore reducing the chances of chipping the gears?
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