Which Axle Ratio Should I Go With?

[southernfriedcj]

.355's should be fine, but I'd go .373 if you take it on the highway often and .411 if you don't. I'm a fan of low gears.

[Salvatore]

I love low gears in a small block too. 3.55 or 3.73's are fine. 3.73's if you ever want to put a bigger tire on.

[BUIZILLA]

3.55 with 26" tires
3.73 with 28" tires

[m22mike]

To heck with that...4.10's....
Black Beauty does good on the I state's @ 60 I am @ 3800.
Have some fun..

[XXXGoldL34M20]

i will use my friends car as a sample for you as the car is almost the same as yours.
he has a 1973 Camaro Z28 RS with stock 350 motor and a 4 speed,about 300 hp stock or less.only mod is headers.
he ran 3:31 before and the car ran like a dog.
we put a 4:10 gear in a few years ago,car runs like a champ!
with that little small block you need the low gear ratio of 4:10 to get that zip out of that low HP motor and my buddys car isnt all that bad on the highway as the small block handles the higher revs just fine.
he does have the factory taller 15"x7" rims though were you have a 14"x7" so you will rev a touch higher than his 3000 rpm. i would guess about 3200 rpm when your done at 60 miles per hour.

[Plowman]

Go 373 with a 700-r, best of both worlds.

[WILMASBOYL78]

Keith has a good point about the performance tune-up...get the engine running the best it can, before you make other mods. The stock exhaust and intake setup will also limit your progress...headers and an aftermarket intake will make a big diference, you can keep the QJ. They are bolt on items that can always be changed back if neeeded....you might also consider an upgrade for your tranny with a mild peformance converter. I think the 3.55's are a ggod choice for the street...especially with the stock size 14" wheels and tires. You didn't mention a budget....so that obviously will impact what you decide to do. Good luck...wilma

[jbsides]

If you are anywhere near J&S Gear on Gothard in Huntington Beach, I would talk to them before deciding. I have them populate my bare '69 12-bolt housings for me, usually with Eaton guts and Tom's axles. Nothing shows, so I don't care about part numbers, I just want it done right, and that is the way they do it. I would predict they recommend 3.42 posi with that combination. Driveable on the street and fwy.

JB

[Salvatore]

[ QUOTE ]
To heck with that...4.10's....
Black Beauty does good on the I state's @ 60 I am @ 3800.
Have some fun..

[/ QUOTE ] his motor will blow, its a mush lifter small block!

[musclecar fan]

Thanks everyone for your feedback. It seems given the fact that I have a 350/300 + Turbo 350 Trans with a 3.07:1 axle ratio, non-posi, 12-bolt rear and 14x7 ralley wheels with T/A 235/60/14 tires, stock dual exhaust with transverse muffler, Quadrajet, stock intake, and Air Conditioning that 3.55's is the recommendation. It's not Posi now. Any reason to change to posi? Not in an Icy state, I'm in California. Not looking to race the car. Just want more Umph to it when I step on the gas pedal. It's super slow now.

If I just change the non-posi 3.07 to no-posi 3.55 gears how much should that cost me for the ring/pinion and labor? Any recommended shop or individuals that can do this for me in Los Angeles area? I'm in Van Nuys. Thanks again fellow enthusiasts.