reddog6625

checked the clutch nothing checked the diff gear nothing checkedf gears nothing.and thats where the problem starts.
im outside with mi fg giwing it a full load the car goes fine rews up nice the engine is cool ewerithing is allr right until a little bump comes the car lifts up from the groun still ewerithing ok but lands back
and upps it is making funni noises lik a wrentch key
what it could be can anyone help please
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Mr. Mugen

can't understand your post. Too many spelling errors or something. What is your problem? I am sorry but it is unclear what your issue is. Peace

reddog6625

Checked the clutch, nothing. Checked the diff gear, nothing. Checked gears, nothing


I am outside with my fg adding it a full load of throtle, the car goes fine rews. up nice the engine is cool ewerithing is all right, until a little bump comes the car lifts up from the ground, still ewerithing ok but lands back .
Upps it is making funny noises (sounds) like a wrentch key
what it could be can anyone help please
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Mr. Mugen

It could be your rear left upper arm flexing. If so it will be hitting your spur gear. You will know it is by the gear being chewed up at an angle from the front of the gear towards the rear of it. It is common and CNR arms will fix it or a smaller spur.

reddog6625

it is not the upper arm it is absolutely clean
no marks on it what so ewer checked it (the spur gear is on left hand side of the engine?if it is than that is clean as well no marks. sorry im not wery good at english)
the sound comes out from the car ewen if it is the smallest bump, the weight of the car lifts up so the rear wheels can rew up a bit when it lnds back it does the wrenchy noise. (it is an fg monstertruck)

whizzy

i had this problem on mine and what we found it was was the layhaft gear an the diff gear more so when it lands after a bump its the flex between the 2 as the cars back lands on the rear obviously there is alot of weight at the back u cant really cure it but u can help it with a stronger rear brace alloy diff mounts alloy gear plate and generally just making sure everything is real tightly screwed up

notman

does it only make the noise under a full load?

reddog6625

could you plesa explain it to me easyer i did not understand it

reddog6625

::::to notman::: no it does it when the cars weight lifts up from the ground and the wheel can spin a bit more faster

whizzy

ok here goes when at the back end of your truck u have the engine which is the heaviest part and what happens because of the weight at the rear the plastic diff housing flexes causing the diff gear and the layshaft gear to cause that noise when u land it doesnt do it any damage in short term but the noise sounds as if it does but thru time it might

the way to solve it is to upgrade to alloy diff mounts,stronger rear brace or an adjustable rear brace and just generally making sure everything is tight screw wise

reddog6625

so the gearing slips between the two?

whizzy

basically yes but if u decide to upgrade to alloy diff mount u really need to do the gear gear plate and your upper arms too and kp designs stonger rear brace or the adjustable rear brace

reddog6625

yes but the car when it was new it was not doing it. and i tested it now it does not giwes that sound out when it has not got thorottle on it but goes across a bump

cyclops1970

My Feedback: (5)

readjust your motor , the layshaft pinion and diff ring gear have to much play in them now ..
give that go ..

raptor 8

sound to me like motor needs realigned and retightened down. IE you motor is moving. Lots of these suffer from this because of the plastic mounts.

reddog6625

ok so if i buy alloy motor mounths that will help a lot? and plus different gear ratio? thanks for the reply for all the rc maniakssss
i will let you know how it goes and than i post some pics

onewaymaxx

check rear wheel hex set screws

raptor 8

the alloy mounts keep everything aligned better, without alot of movement. Yes they help alot.