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Old 08-10-2012, 01:07 PM
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daily driver rear end gears

i have a th350 trans with a 2200-2700 stall. with 323 gears are these gears good or should i go to 342 or 373?

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Old 08-10-2012, 01:28 PM
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You didn't give much info, do you drive this car on the freeway or just around town? 3.23's would be good for hwy driving while the 3.73 would work around town. Why the stall converter?....what kind of engine and hi perf. parts?
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Old 08-10-2012, 01:43 PM
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You didn't give much info, do you drive this car on the freeway or just around town? 3.23's would be good for hwy driving while the 3.73 would work around town. Why the stall converter?....what kind of engine and hi perf. parts?
the car will be driven around town & hwy
sbc 350 bore 40 over comp cam 280h magnum,rpm intake, 600 edelbrock carb, long tube headers, 9.9.1 cr.
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Old 08-10-2012, 02:38 PM
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I would go with the 3.73's and give up a little gas mileage on the road, the 280 mag cam and almost 10.1 compression will like them. I would also go with a bigger carb, like a Holley #3310 700-750. You can get by with a 600 but it would run better at WOT with the 3310.
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Old 08-10-2012, 03:01 PM
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i have a th350 trans with a 2200-2700 stall. with 323 gears are these gears good or should i go to 342 or 373?
No mention of tire size?
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Old 08-10-2012, 04:04 PM
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No mention of tire size?
tire size is 205/70/15
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Old 08-10-2012, 04:07 PM
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I would go with the 3.73's and give up a little gas mileage on the road, the 280 mag cam and almost 10.1 compression will like them. I would also go with a bigger carb, like a Holley #3310 700-750. You can get by with a 600 but it would run better at WOT with the 3310.
so i would still be able to get on the freeway with the 373's
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Old 08-10-2012, 05:32 PM
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Originally Posted by the82elco View Post
tire size is 205/70/15
I come up with 26.3 inchs tall. I coming up with about 2900 RPM'S at 60 mph. That may be a little steep.

342's looks to be about 2700 at 60.

Your 323's should be around 2500 at 60.

Keep in mind the calculators are not always SPOT on.
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Old 08-10-2012, 06:00 PM
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Are you talking about a 60mph freeway or a 75mph freeway? IMHO you've got too tall of gears for quarter mile type activity, but good for a daily driver. I also feel your cam is a little big for a daily driver but that's up to you. The torque converter will get you by.

Gear ratios: About 3000 rpm at 71mph. About 3500 with 3.73. Trust me. 3500 for very long on the highway is buzzy and annoying for most people. Just ask around at a car show.

Over the years my friends and I have pretty much settled on the following gear choices: 3.08ish, stock converter and small cam-shift about 5000. 3.31s will work in anything that doesn't pull more than about 5800. A little too high taking off and at the end of the quarter mile, but killer once it's moving. A converter that stalls like yours. 3.73 for what I call the "three-quarter cam hot rod high school setup," shifting around 6000. 2400-3000 stall for a small block, 2400 for a big block.

Naturally you should modify any of the above to more meet your needs. In high school, when premium was leaded and truly high octane, my buddy had a 427 in a 66 Chevelle that would pull 6100 rpm with 3.08s in it. Don't ever do that with a stock Chevelle. I now know that hinge pins were not thought up just to be cool. Also the engine didn't start pulling until about 3200. We smoked a lot of clutches.

I'd drive the 3.23s for a while and then decide. You can't go wrong with that! Get it out and enjoy your ride.

One more thing. I believe you'd feel very little power gain, if any, by adding a larger carburetor. I'm presuming (not ASSuming) your engine isn't built hot enough (if you can actually use it as a daily driver,) to take advantage of the extra cfm. That's your call though.
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Old 08-10-2012, 09:55 PM
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The 3.23 will work well on the highway. You will hate 3.73 on the highway without overdrive. The 3.23 will still work fine in town. Like Rineholio said, give them some time and see how you like them.
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