how to tell what gear ratio

[west747]

hi. i have ring and pinion set for a ford 9inch but i am unsure of the ratio. all it has for marking is m146 scribed in it. is there some way to dtermin the gear ration by counting the # of teeth in the ring and dividing it but the # of teeth in the pinion... thanks for any advise.

 

[redrooster]

Oil pressure?

Yes, divide the number of ring gear teeth by the number of pinion gear teeth. Example 43 ring gear teeth divided by 14 pinion gear teeth = 3.07

 

[west747]

cool. thanks

 

[Snitty]

so what did you end up with

 

[west747]

5.143564789...lol 5.14 i guess..however it was the ratio i was looking for. i need a set to match my dana 44's 5.13 and i think this is close enouigh.

 

[far_right]

Unusal YJ/TJ

wow.... where did it come from.... was it a drag-racing rear end, or was it already in a rockcrawler.... thats a little low for 36" tires....

 

[west747]

got the gears from a buddy of mine...he was going to use them but then just forgot about em....heheh my gain... i dont plan on running 36' tires for too much longer. i am doing an soa with my axle swap this winter an am planning on running 40 inch bogger( or something close to it) in the back and 39.5 tsl's up front,.

 

[Snitty]

personally, i'd say that 36" is plenty... anything bigger is overkill