pbplya888

my rc18mt's diff seems to be slipping, i have it pretty much stock (stock motor ESC batteries) and the gold ourdrive rings and 2 shims in each diff. yet the still slipp and grind under load (taking off hard, breaking hard, going from reverse to forward, climbing dirt hills or going over little rocks) its pretty loud and i know it cant be good, anyone have any ideas would could be causeing this or how to fix it?

Wookie

My Feedback: (5)

Many times an extra shim or two needs to be added to the diffs to get them shimmed correctly (I run 3 shims instead of 2 in both of my RC18's).

Manufacturing tolerances are not great on plastic parts and some diff cases are a little wider than others. Also switching to aluminum differential/gear cases will help a lot since they won't flex like the plastic ones do.

pbplya888

so, they just do that out of the box?

Seek and Destroy

the pinion and the gear on the differential might be stripped. you might also have to rebuild it because it might be out of grease. my rc18mt had all those problems and i fixed it by changing all the gears except for the spur, rebuilding the diff and putting the shims on. problem solved.

wookie, which side do you put the shims on cause i forgot.

Seek and Destroy

i'm not sure but i've heard a probably 5 people that it has happened to not including me or you.

Wookie

My Feedback: (5)

The shims go on the back side of the ring gear (opposite side of the teeth).

Some of the RTR's will do it straight out of the box. Mine did, especially when braking. Some models will require more shims than others.

pbplya888

mmkay ill try getting some new diffs, but would you sugest more of the stock, the delrin or aluminum gears?

lvblueyedboy

I had the same problem I replaced every thing and then I posted a message and found out 1 I had the shims on the wrong side and 2 I need the third shim. It fixed the noise.

pbplya888

mmkay ill try and get the shims first

Savage_OWNS

i had this problem with my mini-t and it might be your actual spur and pinion not meshing too good

pbplya888

i opened it up and found out that the 2 front differential gears are a-bit rounded off, so i droped the $2.99 and got some off eBay, but untill i get them, i just lossend up the diff and lubed it up with some grease for my paintball gun and it seems to work pretty good.