Need Info on Upgrading My '55 Chevy Rear End!

Performance & Modifications
1

I’ve been looking to upgrade the rear end in my 1955 Chevy and could use some guidance from the experts in the community. Here are a few questions I have:

Current Setup

  • I currently have a stock rear end but feel like I need something stronger given the power upgrades I’ve made to the engine.

Questions:

  1. What are the main advantages of upgrading from the stock rear end?
    • I’m looking at performance improvements, reliability, and compatibility with future modifications.
  2. What specific rear end options would you recommend?
    • I’ve heard about some aftermarket solutions but I want to know what has worked best for you all.
  3. Compatibility with other models?
    • Are there any rear ends from later models that are a direct swap or good fit for my '55?
  4. Gear ratio recommendations?
    • With my engine setup, what gear ratios might maximize performance without sacrificing too much on the highway?
  5. Technical Specs & Measurements:
    • If anyone has the measurements for the '55 rear end that would be super helpful for comparison.

Additional Thoughts

I’m considering options that are also good for handling and not just straight-line speed. Any experiences with different setups or advice on brands would be greatly appreciated! Looking forward to your thoughts and any tips you have! Thanks!

Conclusion

It can be a bit overwhelming with all the choices out there, but I’m excited to hear your suggestions and experiences. Let’s get this discussion started!

2

I recommend you consider a 10-bolt rear end if you’re looking for an easy upgrade. It’s compatible with the '55 Chevy’s drivetrain and offers a good balance of performance and reliability.

3

I’ve heard great things about the 12-bolt rear end too. It’s a bit more heavy-duty, and it can handle more horsepower if you’re planning a performance build.

4

Stock rear ends are definitely easier to find, but aftermarket options like the ones from Moser Engineering can give you more performance customization. Just make sure to check compatibility with your current drivetrain.

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5

True, but don’t forget about the Freedom Performance and Currie rear ends! They come with great upgrade options and can make your ride more responsive.

6

I’ve been looking into these options myself. Is there an easy way to figure out if a rear end will fit with my TH350 transmission?

7

The general rule is that any GM 10-bolt or 12-bolt should fit with a TH350 if it’s set up correctly. Just check the mounting points on both your driveshaft and the rear end.

8

Good to know! I wonder if a Ford rear end would fit. People say it’s possible with some modifications!

9

You can swap a Ford rear end in, but it will require a lot of tweaking, especially in the mounting brackets. Just be prepared for some fabrication work if you go that route.

10

What about using a newer Chevy rear end? I’ve heard they can offer more gear ratios and better handling.

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11

You can absolutely use a newer rear end! Just make sure the width and spring perches are compatible with your '55 Chevy’s frame.

12

If you’re after performance, consider a G-body rear end. They’re wider and give better stability during cornering and high speeds.

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13

That sounds intriguing! But does it fit without major alterations?

14

It does fit with some slight modifications to the brackets. Just make sure to check the alignment before you make any cuts!

15

Honestly, upgrading the rear end is one of the best decisions you’ll make for your '55. Don’t skimp on quality if you’re going for performance!

16

I second that! You often get what you pay for with these upgrades.

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17

And hey, you’ll love the ride once you’ve made those upgrades! It’s like night and day difference in performance.

18

Hey there! Upgrading the rear end is a great way to boost performance. I’d recommend looking into 3.55 or 3.73 gears for a nice balance of power and drivability.

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19

What about posi-traction? Is it worth it for improving traction in my '55?

20

I think adding a posi-traction diff would make a huge difference! It really helps with acceleration out of corners.

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