Revo runs but won't drive...differential?

[getsch]

I just got a traxxas revo 2.5r from a buddy and just got it running. It seems to run fine and I drove it around for a couple minutes but then it progressively lost accelleration do to some type of slippage. The engine wines but the car slowed down and then stopped moving after a little bit. The forward drive went first, and at first reverse was fine, now neither run right. when I spin the transmission by the motor it seems to spin fine to the drive shafts but there seems to be some clicking in the front differential that seems to be causing the slip.

Anyone?

 

[itsalifeworthliving]

first check the slipper clutch to make sure it is tight enough, if you havent all ready. if all is good there, next try to hold the spur gear and push the rig, to see if its still popping. are you saying the front drives went and it was only running on 2 wheel drive. if so then you can count on the rear diffs being bad as well. the diffs arent independintly strong enough to run the rig.. when you had it running, was it popping when you applied the brakes? if so, thats the diffs as well..

 

[Rolex]

If you were noticing slippage, and getting engine whine, you must have a problem with the slipper clutch. Deal with that first, then run the car and check the rest, and let us know.
itsalifeworthliving is right when he suggests that the pops or clicks are from a diff.

 

[Revo Lover]

i dont know if i understand your problem completely but from what i get out of it, i would say hubs? take off your tires if you havnt already and check your hubs.

 

[olds97_lss]

You have to follow the power. If your on the gas and the truck isn't moving, but the engine is rev'ing, your power is obviously being lost between the engine and the ground.

1) Watch the spur/CB. if they aren't spinning, then your clutch is gone or your flywheel is spinning on the crank.

If ok, move on.

2)Check the shaft the spur is on. If the spur is spinning, but the shaft is not, your slipper is either loose or fried. Tighten or rebuild.

If ok, move on.

3) Check the center axles. If they are both not spinning, then your issue is in your trans or the pins fell out that hold the axles onto the trans input shaft.

If ok, move on.

4) If the center axles are spinning, but the wheel axles are not, then either your diffs are blown (badly), your pins fell off the diff end of the center shaft or the pins fell off of one or more of the front/rear wheel axles at the diff end.

If ok, move on.

5) If the wheel axles are spinning but the wheels are not, then you blew a wheel hex or axle pin.

If it's inside the trans, it could be a fist full of things, like not being in gear properly, having gears with the teeth ground off inside, having a blown OWB in the two speed, a sheared pin for one or more of the gears, a pin that fell out inside for one of the gears...

That's the general process of elimination of drive train failure in most rigs.