i have a 90 maro rs v6 3.1L. wut do i need to look for wen lookin for rear end gears? bolt pattern? an anything else i need to know

 

not really anything to look for actually, except what your car is. Unlike the ole' muscle cars that sometimes got different options just for the sake of getting them , we were pretty standardized. On the boards here there is a list of all gear ratio's available for a particular car, it goes by year, engine, and transmission line up all three and boom, you've got ur axle ratio. On the contrary, there's also a code on the axle shaft, believe passenger side front, stamped on, and most likely covered under 14 years of road grime, but it'd be there if u scrape hard enough, as long as ur axle's original, it'll say it on there. Think Auto cars in 1990 got 3.07 while manuals might have gotten 3.27(3.42) do a check to see it's under the tech data on the first page.

 

first thing you might want to do is looking into a spell checker. only thing to consider as far as the 10 bolt rears go is the carreir series,

 

haha sorry about that i juss had to type that quick in my class i was abreviating everything i could. but i have an auto so is there anything thats gunna be too high or low? like i dont understand what 3.73 and 3.5 and all that stuff means. im looking mainly for acceleration.

 

3:42 i think is the most common for thirdgens. 3:73s work good too. i'd look at what other people have that run a similar set up as you have. with OD trans either gear set would work well for you.

 

the 3.73/3.42/3.07/2.77 etc are all ratios in comparison to :1 so it's actually 3.73:1 . It's a gear ratio, in other words, if you had a gear with 10 teeth on it, then the other gear would have 3.73 times more teeth, or 37.3 teeth, in effect this gives the car the ability to turn one thing more than the other. If you've got a "gearing advantage" it makes it possible to turn the wheels much faster than the engine is turning. There are gears in your transmission that do the same thing, those gears give you the ability to run at faster speeds (the reason the car shifts). So, the idea here is that the more gear advantage you have, the faster the car can turn the wheels and move into the next gear. The only cars that recieved 2.77 gears that i know of are v8 cars, the sixes didn't get nearly as many options, the vast majority of them came with a 3.42 ratio (really helps the acceleration, given our lack of hp) a 3.73 ratio would give you an even better advantage to turning the gears quickly in comparison to engine speed. The highest recommended ratio for anyhing is 4.10 but thta's high no matter what you say, infact it's way to high for street driving. 3.73 works good for driving around town, and improving acceleration, so if i were you that's the ratio i'd look for, 3.42 might be what you have now, but like i said, depending on how your cars setup (auto/manual) you may also have 3.07 or 3.27 and some 3.73's would really wake it up.

 

I know in 91, the autos got 3.23, and manuals got 3.42. I think 1990 was the same.

If it is your daily driver, its not really advised to go above 3.73 as said above, it will really turn some rpms on the engine, and suck the gas more.

If your auto, I would bump up to 3.42 (5sp ratio), and if your already 5sp, bump up to 3.73.

If your going yard scouting, you really need to do some research first, that way you can find the rear axle code on the housing before ripping it apart. You may also beable to pick up an LSD while while your at it for not much more

You can use gears from camaro, s10, astros, impalas, regals, grand national, and MANY other gm cars that used this same basic axle design.