Mini tubbed = shorter axles? - Chevelle Tech
Transmission & Driveline Transmissions and Differentials

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post #1 of 7 (permalink) Old Mar 2nd, 19, 6:17 PM Thread Starter
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Chris
 
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Mini tubbed = shorter axles?

Those that have mini tubbed their cars, did you go with a narrower rear end?

I've been thinking of swapping gears in my current 12 bolt, or buying a new Moser rear end. But I'd hate to buy stock sized 70-72 rear end to find it's too wide if I ever do the planned mini tub. I was thinking of having axles 1/2" shorter for a 1" narrower rear end to bring the wheels closer to the frame when I run wider tires.

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post #2 of 7 (permalink) Old Mar 2nd, 19, 6:41 PM
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Re: Mini tubbed = shorter axles?

I mini-tubbed my '69 Camaro years ago. Before doing that I put a 9" under it out of a '67 Mustang. The swap was real easy because the rear was 1.5" narrower than the stock rear. When I mini-tubbed it I went even narrower on the rear because I planned on running the same wheels. You might be able to swap wheels with more backspace and not touch the rear.

Before and after mini-tubbing. Before I ran 28X10" slicks, after I went to 29X12". Now it sits down over the wider tire better.
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post #3 of 7 (permalink) Old Mar 2nd, 19, 6:59 PM
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Freddie
 
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Re: Mini tubbed = shorter axles?

The rear end width depends on the wheels that you are using, not the width of the tubs. You can run wheels as wide as you want with a stock width rear end as long as the wheel back spacing is right.

The '64 to '67 Chevelle rear ends are 1 inch narrower than the '68 to '72 rear ends. If you get a new rear end then you can have it built to the earlier width if you want a little less back space on the wheels. You can go a little narrower than that if you want, but if you go more than 1 1/2 inches narrower than the early rear end then you are going to be getting into trouble with the lower control arms brackets.
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post #4 of 7 (permalink) Old Mar 2nd, 19, 8:17 PM Thread Starter
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Re: Mini tubbed = shorter axles?

Right now I have 15x10 with 5.5" BS. I have 3 sets of wheels.

I would like to have the ability to run a Goodyear 8.00-15 Bluestreak road race tire, which is advertised at 13.2" wide. Rather than getting new wheels for that, I could run a narrower rear end to center the 15x10 in the wheelwell for when I run those tires. This would mean I'd need to run a 1/2" spacer during street and drag racing (if I keep the 295/55R15s). Many hate spacers, but with a 1/2-20x 3" ARP stud, I think it'd be okay.

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post #5 of 7 (permalink) Old Mar 3rd, 19, 5:36 AM
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Re: Mini tubbed = shorter axles?

When I installed a 12 bolt from a 70 Chevelle in my 64 I had it narrowed around 1.5Ē/side(from 30 1/16Ē axle lenght to 28 1/2Ē) its possible to narrow little more before you get in to trouble with the control arm brackets but I had to ĒreverseĒ the shock mounts to clear the backing plates. I only did it so I could use wheels with more backspace since I like the look of deeper wheels.

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post #6 of 7 (permalink) Old Mar 4th, 19, 12:05 AM
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Re: Mini tubbed = shorter axles?

Quote:
Originally Posted by -SS454- View Post
Right now I have 15x10 with 5.5" BS. I have 3 sets of wheels.

I would like to have the ability to run a Goodyear 8.00-15 Bluestreak road race tire, which is advertised at 13.2" wide. Rather than getting new wheels for that, I could run a narrower rear end to center the 15x10 in the wheelwell for when I run those tires. This would mean I'd need to run a 1/2" spacer during street and drag racing (if I keep the 295/55R15s). Many hate spacers, but with a 1/2-20x 3" ARP stud, I think it'd be okay.
A 15x10 wheel w/5.5" backspace (0 offset) will be located close to dead center in the wheelwell. Before I spent all that money to mini-tub it and narrow the rear, I would first try fitting a pair of those Blue Streaks. They might fit w/o all that extra work. However, if you have plans to fit at least a 12" width wheel and 335 tire, a mini-tub is required.
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post #7 of 7 (permalink) Old Mar 4th, 19, 10:11 AM Thread Starter
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Re: Mini tubbed = shorter axles?

Quote:
Originally Posted by Clint44 View Post
A 15x10 wheel w/5.5" backspace (0 offset) will be located close to dead center in the wheelwell. Before I spent all that money to mini-tub it and narrow the rear, I would first try fitting a pair of those Blue Streaks. They might fit w/o all that extra work. However, if you have plans to fit at least a 12" width wheel and 335 tire, a mini-tub is required.
My 295s have rubbed with hard cornering. I had to bang in the inner wheelwell for better clearance. 295s are 12.2" wide, wouldn't be able to fit 13.2. This is all future planning, and I figure I may one day want to try some 18" track tires, in which case I'll shove as much rubber under the car as possible.

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