RCU Forums - View Single Post - Quick OFNA Truggy gear pitch question

05-06-2024, 06:55 AM

#6

byggd

Join Date: Jun 2006

Location: corona, CA

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Quote:

Originally Posted by bill_delong

I feel like a broken record:
OFNA Spur Gear Question

That link I posted is the most economical part that is likely compatible from the same OEM

According to this manual here for the Ultra MBX R2 they specify the stock spur as #31040
https://www.manualslib.com/manual/76...?page=6#manual

https://www.ebay.com/itm/175835724837

I've ran enough HongNor cars that chances are you may get a full diff to work as well if you measure the bearings and distance between the slots in the diff mount then ask someone on RC Tech to measure and confirm:
https://www.ebay.com/itm/255127759402

After you take your measurement (outer bearing to outer bearing) and verify bearing diameter, then ask someone on this thread to confirm measurements:
https://www.rctech.net/forum/nitro-o...in-x1-crt.html

I still have the original center diff and it includes the 31040 spur gear. When the truggy kit was installed, it included a solid shaft to replace the diff and an ONFA 18163 65T spur gear to compensate for the larger tires. Neither the 31040 or 18163 spur gears have a 32 (or 48) pitch. The bell clutch / 31040 and 18163 spur gears have a 22P. So purchasing the 31040 will not work when converting to brushless.

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