X4 gearing with brushless?

[dobber]

Hi

I have a standard x4 pro and am looking to upgrade the motor to a losi 6.5t brushless. Will the gearbox be ok or will it need some upgraded parts? I guess a 21 or 22 pinion would be ok too?

[jasonrcb]

The gearbox will be fine,just make sure you shim diffs up nice and tight and have the slipper set to slip slightly on take off.

I run a 5.5 in mine geared 21-85

[Cameo]

Hi

I have a standard x4 pro and am looking to upgrade the motor to a losi 6.5t brushless. Will the gearbox be ok or will it need some upgraded parts? I guess a 21 or 22 pinion would be ok too?

This will be fine I run a 7.5 with boost. They have released a new rear gearbox mount (pic attatched) I have one coming it should help manage the power of the big motors :D
http://www.tcmodels.net/index.php?page=shop.product_details&flypage=garden_flypage.tpl&product_id=1026&category_id=61&option=com_virtuemart&Itemid=71

This topic has been discussed check out http://www.oople.com/forums/showthread.php?t=69519