RB5 Gear Diff Mod

[snowmiu19]

Hello fellow RB5 drivers,

Have anyone of you encountered someone who have done a geardiff mod on the RB5? Please share if you have any know hows.

Thanks

Regards
Calvin

[Gayo]

I run an Ultima SC gear diff on my RB5-based MCS. I had to dremel slightly the diff screws and the gearbox in order to avoid any friction, but I think it is a drop-on fit on the roomier RB5 gearbox.

I had to buy the parts separately as Kyosho doesnt sell it as a unit.
-KYOUM605 (gear set)
-KYOUM610 (bevel gear set)
-KYOUM613 ((bevel shaft set)
-KYOUM612 (outdrives)
-KYOUM611 (gasket) (not sure if needed, read below)

I filled it with 3000wt Kyosho oil but it quickly made a mess on my gearbox, oil everywhere and none into the diff So I filled it once again, but I used silicone bathroom sealant instead of the paper gasket and under the diff screws.
So far so good, after 2 trainings on our outdoor carpet club track (roughly 2 hours of track time) the diff is fine, smooth, with all the oil still inside
Don't forget to set your slipper properly as there is no give on a gear diff.

I see on Red RC that Kyosho is about to sell steel diff gear : http://www.redrc.net/2012/04/kyosho-...Car+News+DF%29

[Matthijs]

indeed a perfect fit in the normal RB5 gearbox,parts:
um605
um610
um611
um612
um613
ORG045S, must use them for no leakage, used 1000 cps for a smooth balldiff feeling

[Gayo]

Oops, I forgot the ORG045S o-ring.

Yes, 1000cps must be good. My 3000cps diff feels a little too stiff, awesome for traction but a little glued on hairpins.

[snowmiu19]

Thanks for the respond guys. Got any pics to show?

Regards
calvin

[Matthijs]

Originally Posted by snowmiu19

Thanks for the respond guys. Got any pics to show?

Regards
calvin

nothing special, here is a gear- and balldiff. I've used it for a few day's on an indoorcarpet track. Have yet to try it outdoors on a dusty loose track ;-)