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Old 08-30-2009, 07:15 PM
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Default Rear-end gears? (350-427)

I have a 350 in my camaro with a stock rear end. I am trying to get a little more punch out of it and was wondering if 356's would need any rear end work or if I would have to tighten the suspension down at all to handle the 350 for now?

The plan is to drop a 427 with 500-550 horses in it sometime next year, and I was wondering if the 356's would be also able to handle the hp coming from the 427?
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Old 08-30-2009, 10:46 PM
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The gear ratio has very little to do with whether the rear end will handle the horsepower. The ratio of 356:1 is a pretty decent ratio for either engine, and a nice range for both street and highway. The 427 can handle a lot higher geared rearend (lower number) than the 350, as it's extra torquedoesn't need a low range rear gears.
What you need to handle any engine with lots of HP is a rearend in good condition, and positraction, or a locker.
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Old 08-31-2009, 03:31 PM
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I didn't think they made 3.56 gears for a 1971 - 1981 8.5 but for a 1967 - 1970 8.2 rear they made a 3.55 IIRC. Is this a Ford 9 you're putting it in?
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Old 09-01-2009, 05:23 AM
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no its my 79 camaro...a friend told me that 356 was what i would want to maintain the highway miles instead of a 4.11..it has 2.92's right now and I am trying to figure out how to give it a little more power off the line...so i was told to get a set of 3.56's
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Old 09-01-2009, 12:20 PM
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If it's the stock rear end it's a 10 bolt (8.5"). As far as I know they don't make 3.55 gears for it. They make 3.42 then go to 3.70 and 3.73. You can get 3.55 gears for a 12 bolt (8.875").
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Old 09-01-2009, 12:35 PM
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If it's the stock rear end it's a 10 bolt (8.5"). As far as I know they don't make 3.55 gears for it. They make 3.42 then go to 3.70 and 3.73. You can get 3.55 gears for a 12 bolt (8.875").
Yeah, I've always seen it jump from 3.42 (what I have) to 3.73 gears. I really wanted a set of 3.55 or 3.6 gears but those only come in 8.2 ten bolts IIRC.
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Old 09-01-2009, 10:14 PM
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Default rear end gears

Ok so what would you recommend if it is a stock rear-end... I kind of want to be able to keep some highway driveability, but i also want to get it to jump off the line...is there a medium ratio that would offer both? From the sounds of things I should shoot for the 3.55 or the 3.73?
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Old 09-01-2009, 10:31 PM
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If you want highway driveability I'd go with the 3.42 with a small block, or 3.31 with a big block. I'm running 3.31 in mine with the 427 and it cruises at around 2,000 at 55-60 mph.
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Old 09-05-2009, 04:35 PM
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I have a 308 and want to convert it to posi. How is this done and where can I get the parts for it. I want good tracktion and good city/highway cruising. It seems from what Ive read above the 3.42 is the way to go. Please help
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Old 09-05-2009, 05:13 PM
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Originally Posted by Franksflying1 View Post
I have a 308 and want to convert it to posi. How is this done and where can I get the parts for it. I want good tracktion and good city/highway cruising. It seems from what Ive read above the 3.42 is the way to go. Please help
If you haven't ever done it before then I would suggest reading up on it before event thinking about the parts. A lot of the tolerances for setting up a rear end are within the thousandsth of and inch (.001 of an inch) and requires a certain set of tools. Even after reading up on it and watching any DVD's you can buy I would suggest doing it with someone who has done it before. It's definantly something that requires a lot of attention to detail.
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Old 09-05-2009, 05:13 PM
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