Need Help with 1959 Impala Rear End Specs and Parts!

Classic & Vintage Cars
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Seeking Advice on 1959 Impala Rear End

Hey fellow classic car enthusiasts,

I’m currently diving into a restoration project for my 1959 Chevrolet Impala, and I need some guidance related to the rear end assembly. I want to make sure I have everything covered, from the right specifications to potential replacement parts that are worth considering.

What I’m Looking For

  • Specifications: Are there specific measurements or components I should be aware of when dealing with the rear axle and differential?
  • Replacement Parts: Any recommendations for reliable sources to find OEM or aftermarket parts?
  • Modifications: I’ve heard that some guys opt for different gear ratios or even differentials. What has worked best for you?
  • Restoration Tips: For anyone who has restored a 1959 Impala, what were some challenges you faced with the rear end, and how did you overcome them?

My Current Setup

I’ve got the stock rear end and I’m considering an upgrade if the budget allows. The goal is to keep it as close to original as possible, while also enhancing performance where I can.

Looking forward to your insights! Let’s share what we know about keeping these beauties running in top shape.

Thanks in advance for your help!

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Hey everyone! I’m starting to look into rear end options for my 1959 Impala. What are the best specs to consider?

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You should focus on the gear ratio’s impact on torque and speed. A stock rear end usually has a 3.36 ratio, but performance upgrades like a 3.55 or 3.73 can significantly improve acceleration!

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I’ve been using a Positraction rear end from a 1965 model, and it’s compatible. It enhances grip during acceleration, which is a huge plus on my Impala!

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That sounds amazing! How did you manage the installation? I’m contemplating a similar upgrade.

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Installation can be a bit tricky! I recommend getting a professional if you’re not comfortable with it. Also, adjusting the driveshaft length is crucial.

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Good point! What aftermarket options offer the best value for performance upgrades?

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I swapped my stock rear end for a Moser 12-bolt rear, and it’s a beast! Handles power like a dream and is far more reliable than stock.

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Did you need any special modifications to fit it into your Impala? Thinking of going the aftermarket route too!

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I would say it fits pretty well, but you might need to adjust the mounting points. Definitely worth it for the performance boost!

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That’s great to hear! I’m leaning towards enhancing my Impala’s reliability as well. Any tips for maintenance?

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I recently restored a 1959 Impala and had issues with the rear end leaking. I found that replacing the axle seals solved the problem. Make sure to check those first!

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Did you use OEM parts for the seals, or aftermarket? I’ve heard mixed reviews about aftermarket quality.

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I had noise issues from my rear end that turned out to be the ring and pinion gears. Replacing them made a huge difference in performance. It’s definitely worth checking if you hear grinding.

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Great tip! What gear ratio did you end up going with? I’m considering a 3.36 for better highway performance.

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I went with a 3.08 ratio, which is great for daily driving. But if you’re looking for a bit more pep on the highway, 3.36 is a solid choice!

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I think it’s important to adjust the rear end properly after replacing parts. Misalignment can lead to excessive wear over time. Always double-check those torque specs!

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Absolutely! I learned that the hard way during my last build. Anyone else here had alignment issues after a repair?

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I’ve faced some alignment issues, and it drove me crazy! Ended up at a shop for a professional adjustment. Sometimes it’s worth the extra cash!

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Just don’t forget that “if it ain’t broke, don’t fix it” mantra—unless we’re talking about a 1959 Impala, in which case, just go ahead and fix everything! :joy: