I have LOW gears lol. When im at 70 im at about 3200 or 3500

could someone explain this too me. why, in the same gear and at the same speed, do "low" gears have higher rpms, and "high" gears have lower rpms?

low gears have a small actual gears so it doest take as many rpms to turn it enough to spin the other gear. The high gear has a larger actual gear so it takes more rpm to get it around. I hope this makes sense im really tired. And someone correct me if im wrong. lol.

I've got 3.9 gears in mine and at 75 I'm at 2850 there about so I'd say you got 3.9 gears.

What h8z2luze said is close, the size of the gear is not that different, but the size of the teeth on the gear is. Smaller teeth means more of them and larger ones means less of them. For example, 4.11 gears have 37 teeth on the ring gear and 9 teeth on the pinion gear, so in short the driveline of the car must turn 4.11 times to turn the wheels all the way around once. You get your gear ratio by taking the number of teeth on the ring gear divided by the number of teeth on the pinion gear, 37/9=4.1111111111111. So if you have like 2.83 gears your driveline only has to turn 2.83 times to make the wheels turn all the way around once, thus giving you lower rpm. Hope this answers your question.

maybe i can help
http://img179.imageshack.us/img179/8595/gearsyu9.png
lower gears have small circumferences that allows them to do a complete 360
faster
while the higher gears have a bigger circumference, hence a longer rotation

bcuz the lower gears needs to rotate more to produce the same amount of power as the higher gear does
the higher gears puts out enough power so it does not need to rotate any faster
rpm = rotation per minute

im not making you sound stupid,
but look at it this way
you got the lower gears as a , small guy , really quick but no muscle
then you got the higher gears, big guy, muscular, but no speed

to push a 3600 lbs object
the smaller guy needs to work more harder than the muscular guy

i did my best to explain that, may not have the proper terms but, i think it works,
if not, oh well i gave it my best shot
hopefully it helps

I found mine, its G285 :)

So would that mean that the rearend has 4.30 gears like 4.11's? Cause that would be really low.

Yup, you got some the lowest ones there is, great for in town and racing, shitty for the highway.

thanks for the explination. ive got it all worked out in my head now.