Gear diff

[michaelt4]

Was thinking of putting a gear diff in my sons b4, just for easy maintance. What oil to put in it ( weight) runs on grass with a 13.5/17.5 ?

[KRob]

Do you mean B4 or B4.1?

The gear diff will go in the B4.1 no problem but it will not fit the B4 as the diff outdrive bearings are a different size (B4 is imperial and B4.1 is metric)

[michaelt4]

It's a b4.1

[michaelt4]

What oil is a good starting point?

[BeachBuggyPhil]

I used a good quantity of black grease and had no issues.

[SLEENAD]

Originally Posted by BeachBuggyPhil

I used a good quantity of black grease and had no issues.

Same here!

[Greenpiece]

It really depends on the surface you run on. The more grip the thicker you can go.

Grease will just give you a very free and an open diff. I run on an all Astro track and use Mugen 1.000cps but will be trying 3.000 when the weather let's me.

[Lee1972]

What are the advantages / disadvantages to running a geared diff as opposed to the ball diff?

[Greenpiece]

- a lot less maintenance
- 0% slippage

[BeachBuggyPhil]

I only use grease because I've had trouble keeping thin fluid in the diff but you can buy different weight diff grease. Kyosho sell it.

[BeachBuggyPhil]

That won't run out!!