I'm looking for any helpful information that will help me determine what new gears to buy. I've been told its a good mod but it cuts down on gas milage(which dosn't bother me too much) What have you guys done? Postive and negative opions are welcomed.
Thanks

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89 Formula
Edelbrock Headers+
Catback system,Torque Converter,Rebuilt Trans,B&M Megashifter, K+N air filter, Accel Distr. Module, MSD coil,New Fuel injectors with adj. regulator, ECM with performance prom,and a Crate ZZ3 350

 

you've pretty much covered it. lower gears cut your milage and increase you engine rpm. OD trans helps lower the rpm on the road. 3:73 are no problem at all. i don't think 4:11 is bad with OD. i have 4:56 in mine, but i never drive it very far at a time, about a 1/4 mile or so.

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-=ICON MOTORSPORTS=-
1st & 3rd

 

Yeah, i think i'm pretty set on getting 3.73's cause i have a daily driver and i just have 2.77's now so i think that it will be a good mod. Would you recomend any brand. I'm swinging towards richmond.

 

go with richmond 3.73.....I got them and i luv them. Car screams now

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1989 pontiac firebird
bright red exterior(just repainted)
grey interior
5 spd
305 TBI (stock)
WS.6 formula wheels
3.73 posi rear end
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system: 2 10" MTX thunder 2000 in a Professionally done custom bandpass box.
Blaupunkt CD player
Blaupunkt 4x6 and 6x9
600 watt rockford fosgate 4.6 amp

thinking about a flowmaster

 

Ok wait a second. If you have 2.77's now, then you're just about out of luck on new gears. The 2.77 is a 9-bolt ratio, and they dont make gears to replace 2.77's, only for 3.27's and 3.45's. You'll need to get a new rearend, preferably out of a 90-92 f-body, so you keep your better brakes and 28 spline axles. Or you can try to find an 89 3.27 or 3.45 rear end.

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1991 Camaro Z28
5.7L 5-Speed (originally 305)
13.25 @ 107.18 MPH
Southern California
Member: SoCal 3rd Gen F-Bodies
Webmaster: SoCal F-Bodies
-=ICON Motorsports=-

 

I'm still not sure if i have 2.77 gears or not. I have no way to know for sure as of now so i guess i'll just have to wait until i take a look at the axle spline. I hope i don't cause it's gonna be a pain in the butt if i gotta get all new housing. I'm gonna try and find out tomorrow.

 

count the bolts on the rear end cover, if its nine then you are SOL (like me).

 

Do you have a single cat or dual cats? Do you have your RPO code sheet in your glove box? Check it for a GW or a GU code, then put that code in the RPO decoder on this site. That will tell you what rear end gears your car came with. Also, get on the freeway, put your car in third gear (drive) and note what RPMs you are at, at 70 MPH. Then post your findings here and we can tell you what gears you have.