Harry87

My car is making a knocking type noise while I'm running the car I checked the gear mesh and it's all good just can't figure it out

bmx_ican92

iTrader: (2)

Probably need to shim the gear diff.

Harry87

I don't know how to or what it is exactly I'm trying to learn as fast as I can lol

tom73

iTrader: (81)

Check for a small stone in the pinion or spur gear. Post a video and we can help further.

rustyus

iTrader: (1)

If you checked the pinion/spur, and found nothing, maybe check dogbones for the o-rings that are supposed to be at each end. If the o-rings are there, then the gear diff's planet gears should be looked at for probable shimming issues.

sport10

Did you hold the spur and spins the wheels to check the diff action. Good way to help narrow it down. Then dissemble down to the diff spinning each step till you find the culprit. I would first remove the pinion and spin the tranny to see if the clicking goes way too to eliminate the motor.

Harry87

Thanks for all the help guys,I just ran the car like 20 min ago and wanted to ask what part of the car controls the brake? Because I've noticed the car knocks more hitting the brake I didn't know if that can help figuring it out?

sport10

Braking is done by the esc. Check the spur and pinion for damage to the teeth or dirt in the teeth. I sometimes use an hobby knife to clean the teeth out or replace if too bad.

Harry87

Dumb question but the two rods that spin to turn the rear wheels have seems like they have alot of play in them could that be the reason ?

sport10

Being an RTR it problably came with dogbones for driveshafts. A good upgrade is going to cvd or cva style driveshafts like comes in the kit versions.

https://www.rcplanet.com/MIP_C_CVD_K...m?Click=119058

These should also add some traction underpower.

rustyus

iTrader: (1)

Side to side play? Those o-rings dry out, and deteriorate after awhile... they need replaced every so often.

Harry87

Not side to side play but I can 1/4 turn it before the wheel starts turning is that normal or loose? It's frustrating not knowing and I'm like scared to take the thing apart lol

sport10

look at the outdrives and see if the slots are worn. It should look straight. If it has been notched out you will have replace the outdrives which means a diff rebuild. Same with the dogbones if they are badly worn and not round they also need replacing. Pics would help a lot.