gear ratio markings

[Blazin40s]

I know this has been asked b4, but how do u tell gear ratio from the numbers stamped on the ring gear?

[RIP_K52007]

divide the big number by the little number

like 42 & 13 would be a 3.23:1

[Blazin40s]

Mine has numbers on it:  1gm 3977334  10  41  12  19

[Blazin40s]

So do I divide 41 by 10?

[RIP_K52007]

i did 41 / 12  be a 3.42 but idk for sure.. thats just how ive done it

[Blazin40s]

I was told axle is a 4.10.......and if u do high number by little number that would be 4.10

[RIP_K52007]

maybe haha  if its sposed to be 4.10 then thats probably it... 3.42 is more common gear. the numbers are how many teeth are on the ring gear vs how many there are on the pinion so if you can see in there to count those it will either have 10 or 12 teeth on the pinion.

[marshall]

yes, its a 4.10, thats how you do it.

i usually count the ring teeth and pinion teeth and divide, not all are marked

[Blazin40s]

Last two numbers are sussposed to be month and year.....but i know this in not from december 1919   lol

[RIP_K52007]

Last two numbers are sussposed to be month and year.....but i know this in not from december 1919   lol

[Eroq]

first pair of numbers is gear ratio, last is date 

[Blazin40s]

first pair of numbers is gear ratio, last is date 

Ok so what would 12 19 mean as second set of numbers?