RC-Monster Forums - View Single Post - Changing differential gear ration by using different pinion.

Gee

Could the beveled pinion used in say 1/8th scale diffs be changed to create a different gear ratio? Giving it is the same pitch.

I have some STRR diffs that are spiral cut and use a 13t spiral pinion and spiral cut ring gear. I picked up some 10t spiral cut GS Racing (Clearance) diff pinions. They didn't have the tooth count listed for the pinons, but $3 bucks a peice vs $15 a piece was chance I took. They seem to mesh fine with the strr ring gear. I think the # of teeth on the GS Racing ring and STRR are the same. Granted that the front and rear diffs would need the same gearing ratio.

Are there any issues I might be over looking?

Is it the ring gear that determines the pitch for the diffs?

Thinking silently but typing it in:

If the pinion came from another rc or manufacture the had the same amount of teeth on the ring gear:
Ofna
43/11
43/13
43/14

HPI
43/13

LST
43/13

H.B.
43/10

Pinions would be compatable as far as meshing goes,

but would the pinion from the:

HPI Hellfire
42/10

or

OFNA Ultra GTP
44/14

would those mesh okay with a 43t ring gear?

	(#1)
Gee A Horse's Ass Offline Posts: 1,065 Join Date: Oct 2007 Location: Spokane WA	Changing differential gear ration by using different pinion. - 12.08.2009, 05:12 AM Could the beveled pinion used in say 1/8th scale diffs be changed to create a different gear ratio? Giving it is the same pitch. I have some STRR diffs that are spiral cut and use a 13t spiral pinion and spiral cut ring gear. I picked up some 10t spiral cut GS Racing (Clearance) diff pinions. They didn't have the tooth count listed for the pinons, but $3 bucks a peice vs $15 a piece was chance I took. They seem to mesh fine with the strr ring gear. I think the # of teeth on the GS Racing ring and STRR are the same. Granted that the front and rear diffs would need the same gearing ratio. Are there any issues I might be over looking? Is it the ring gear that determines the pitch for the diffs? Thinking silently but typing it in: If the pinion came from another rc or manufacture the had the same amount of teeth on the ring gear: Ofna 43/11 43/13 43/14 HPI 43/13 LST 43/13 H.B. 43/10 Pinions would be compatable as far as meshing goes, but would the pinion from the: HPI Hellfire 42/10 or OFNA Ultra GTP 44/14 would those mesh okay with a 43t ring gear?