I bought some gears a while back and i was sure they told me they were 3.42 ratio. HOw do I find out exactly what they are. They are ont in my car so I can count the teeth... How many teeth should a 3.42 have?> What do I do to figure this out. thanks guys, Kurt M djk19@rcn.com

 

Like this

 

If you can count the teeth: divide teeth on ring by teeth on pinion:

41/12 = 3.4167 or "3.42" Ratios aren't always exact, except for combinations like 41:10

popular combinations:

41:15 = 2.7333 (2.73)
41:14 = 2.9286 (2.93) not that popular
40:13 = 3.0769 (3.08)
41:13 = 3.1539 (3.15) C5 automatic performance ratio
42:13 = 3.2308 (3.23)
41:12 = 3.4167 (3.42)
41:11 = 3.7273 (3.73)
41:10 = 4.10

GM liked 41 teeth!

 

THANKS more info then ai needed and definately helpful. Thanks!

 

I have a new ring gear with 41 teeth ( I bought a set a while back 2.73 when I thought I was getting 3.42) CAN I get a pinion gear that has 13 to get the 3.42 or is everythign different with the size of the teeth etc. I was thinking that I could just get anew pinion and be all set. let me knwo thats guys*

 

Ring and pinion are always sold as a matched set. They are usually run in together when they are made. GM gears have the same part number marked on both pieces.

 

I figured that but is it at all possible or worth it? Or shoudl I jsut sell these 2.73's they are off a 2002 camaro with less then 100 miles on them... no wear