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Speedometer Gear
#1
Hey guys I need help figuring out which speedometer gear I need. I have been looking online to figure it out and have been getting stuck on figuring out how many teeth my transmission has.
My car has 215/70/r14 in the front and 235/60/r14 in the rear. I think the diameter is 19.55.

I have the automatic transmission. and i have a 3.00:1 gear ratio
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#2
you need a 16 tooth speedometer gear for a 3.00:1
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#3
72HCODE;24630 Wrote:you need a 16 tooth speedometer gear for a 3.00:1

alright thanks a ton!
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#4
Hey 72Hcode, can you figure mine out? It's not a tricky question. lol , I need one as well. I have 3.50 gears,FMX trans, 275/40/17 rear tires, 245/45/17 front, diameter of rear wheel w/tire is 25 inch. Where can I get one?
Thanks,
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#5
according to my math you would need a 19 tooth gear.

i think the FMX uses the same gears as the c4 or c6, not 100% sure

http://www.summitracing.com/parts/TCI-881001/
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#6
72 HCODE,

Thanks for the help. What is your formula?
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#7
performance trends gear calculator Ver 3

Tongue
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#8
how about a c6 with 3.50 gears 225 70r14

'Mike'
73 Convertible - 351C/4V CC heads/4bolt/forged flat tops/comp 270/rhodes/mallory unilite/tri-power/hookers/glasspacks/c6/3.50 limited slip/Gear Vendors/Global West sub frames, strut rods and shelby style traction bars/ Rear sway bar/tilt steering (not original)

Pics of modifications included in:
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#9
72HCODE;24642 Wrote:according to my math you would need a 19 tooth gear.

i think the FMX uses the same gears as the c4 or c6, not 100% sure

http://www.summitracing.com/parts/TCI-881001/

H, your killing me LOL
Speedometer gears
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#10
72HCODE;24642 Wrote:according to my math you would need a 19 tooth gear.

i think the FMX uses the same gears as the c4 or c6, not 100% sure

http://www.summitracing.com/parts/TCI-881001/
The FMX actually has 2.40:1 as the first gear instead of the 2.46:1 that is shared by the C4 and C6.

Second gear is also different in that it is 1.47:1 in the FMX versus the 1.46:1 for the C4 and C6.

Third gear 1.00:1 is the same for all three (FMX, C4 and C6) transmissions.

BT


Do the RIGHT thing.
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