Problem somewhere in the drivetrain.

[Drusburn]

Hey guys,
Recently I've been hearing a clicking noise when I accelerate from a stop. It didn't happen all the time though and still operated just fine. Now today it stopped going forward. I originally thought it had to do with the differential so I took the tranny apart. My pede vxl is only a couple months old but since I added the GH gearbox I thought i did something wrong with the gears and stripped one or something. However everything in the gearbox and diff is just fine.
Could it be the slipper? I've never ran it more an 1/2 turn off and am only running the stock 7 cell nimh batt. The pads look ok I guess but the disk definitely looks like something slid around it, similar to a brake disk on a car. Could the slipper make the clicking noise I heard? I'm headed to the hobby shop tomorrow so should I get a slipper disk? Can they be refinished instead of buying a new one? Unfortunately it's all apart and I can't put the diff back together cuz I don't have the fluid so i can't flip the disk and try it, hindsight lol.
My problem has to be the slipper right?

[Captain_Rusty]

Everything inside your diff is fine? How old is it? The diff uses grease though not fluid, and the thicker the better. Also, double check and make sure that pins on your axles, both the shafts in the diff and your actual drive axles, are still there. Have you tried with the back wheels off the ground? Or hooking the motor straight to the battery if it's a brushed motor?

[tagar89]

slippers are like 5 bucks. no need to get it refinished even if it was the slipper, but its not. i would check the drive shafts, i went threw a couple sets on my vxl.

Thomas

[Drusburn]

The driveshafts are fine. The part where they mount to the diff is good too. Nothing appears to be stripped. I'm pretty puzzled. Since nothing is stripped anywhere it has to be the slipper right? It was on the ground spinning the motor and the spur gear and not going anywhere.

[tagar89]

Have you tried tightening the slipper, if its tight then there is know reason it would be your slipper. I would look at the pin holding on the gear thats on the other side of the spur, idk what its called. Open the transmission up, and there is a pin holding that gear on i believe, i had it snap on me and it didnt go anywhere.

Thomas

[trevdclear]

the slipper shaft has a little pin at the end where the gear is. if the brakes it will make a clicking nose and not move or move real slow.i broke 3 of them. actualy im putting one in right now lol. tht should be you prob

[Drusburn]

Nothing is stripped and I'm not missing any pins. The truck is only like 2 months old. How long should a typical slipper setup last?

[tagar89]

Ok, this isnt a car clutch were talking about here. IT takes a decent amount of time for a slipper to wear out. There is a pin that holds the slipper on, you cant see it from just looking at it assembled. There is also a pin inside of the transmission. It seems like you want it to be the slipper, so what you can do is go buy a rebuild kit for like 10$ and change it. There is no typical time they last, your driving and power plant come into play.

Take your transmission back apart, im pretty sure you can apply a little bit of power with out ish going everywhere and see whats not spinning. Is the slipper spinning when you apply throttle? Are you sure your pinion gear isnt just loose? There is only so many things it can be. Dont over complicate it, keep it simple these cars are pretty basic.

How you can rule stuff out, start from the motor and go to the tires.

Start with pinion, if everything is tight and its spins like it should go to the
Slipper, check the pin, after that if everythign spins like it should move to the
Transmission, check the pins, if everything is there and working move to the
Differential, if nothing is broke and it works like one should move to the
Half shafts, if these are also fine and are spinning liek they should move to the
Hub assembly, if this is in working order and there are no broken pins or stripped parts then move to

Burning your pede, because some force of nature really doesnt want you driving it if all that struff works I kid i kid

All in all im pretty sure that rules out everything.

Thomas

[tagar89]

Ha never midn, forgot you cant apply any throttle because your motor wont be mounted when you take the trans apart

[Oaks]

Quick trouble shoot...pick the rear off the ground. Spin one wheel. The other wheel should spin in the opposite direction. If so, the diff should be fine. Now use your thumb to turn the spur. Now both wheels should spin in the same direction. If so then the tranny is fine. Next, make sure your bearing is seated all the way into the spur gear. Finally, and I hate to even bring it up, make sure the three screws in the spur gear didn't miss the slipper plate.

[trevdclear]

it sound totally like a slipper shaft/spring pin that hold the gear on in the tranny

[CandyCaner]

Yay, the same thing's happening to my truck. Time to grab the screwdrivers and tear 'er apart.

[rag6]

If the drive shafts are spinning and the wheels are not, you lost a pin in the axles that key the hexes.
Internal top shaft pin may have broken. It would be hard to notice because that gear is pressed on the top shaft and would feel tight in your hands. When installed the gear would just spin on the top shaft when you hit the throttle without that pin there.

Can you see if the slipper back plate is also spinning when the spur gear spins? If they are both rotating, and the truck doesn't move, there is a pin somewhere in the driveline that is missing or broken. No other explanation unless a gear is shot, but you said their all good. Go find that missing pin!

[Drusburn]

Thanks for all the ideas. I got some diff grease yesterday so I can put it all back together later today and see if it works. I havent seen any pins missing. Ive checked every place you guys have said, the spring pin on the slipper gear is fine, and the pin on the outside of the gearbox under the slipper assembly is there too. The pins are in the wheel hexes and the output shafts and half shafts aren't stripped. I'm thinking there was grease or something on the slipper plate, so ill put it back together and see if it miraculously works. If it doesnt ill flip the slipper plate and see if that works. If not im lighting it on fire lol.

[Drusburn]

Ok so the verdict is, slipper plate. Put everything back together using the used side of the slipper plate facing the pads, and same thing happened. Motor and spur spinning but truck not moving, but as I accelerate slowly it will grab. Stab the throttle though and nothing but spin. Switched the plate around and my torque is back!! So I ripped the tranny and diff apart for nothing other than piece of mind I guess lol.
My question is that if ive never ran the slipper out more than a half turn how could that much damage be done to the slipper plate? I have kept it 99% of the time between 1/8 and 1/4 turn out. How long should these plates last?

[rag6]

Maybe grease on it?

You could sand both the pads and slipper ring with 200 grit to get the surfaces back.