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I know it's here somewhere - just can't find it - what is the width on a 64-67 rearend I know it's 1" shorter than 68-72 - but what are the dimensions - thanks
 

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I believe it's 54 1/2" backing plate to backing plate. 68-72 is 55 1/2".

Here is a link to a site that list them by wheel mounting surface.

www.carnut.com/specs/rear.html
 

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Got this info from http://www.chevellestuff.com/index.htm
Click on a year,
then chevelle,
then rear axle codes.

Info is at bottom of page...

* 1964-67 Chevelle rear ends were manufactured by the Chevrolet Gear and Axle Division. The housing measures 53.25 inches from backing plate to backing plate and with the brake drums in place, the total width is 60.00 inches.


* 1968-72 Chevelle rear end housings measure 58.5 inches from flange to flange, and with the brake drums in place, the total width is 62.5 inches. (Note: Other sources put the total width at 61.125" to 61.25".)
The 10 bolt Chevelle rear end has the 8.2" ring gear from 1964 to 1972. It wasn't until late 1972 that the 10 bolt 8.5" ring gear was used in Chevelles.
Rear spring mounting pads differed in that 1964-66 rear ends used a flat pad with a hole drilled in the center while 1968-72 rear ends have circular spring mounting pads, which are 3/4" higher that the early flat pad.
1967 was a transition year in that A-cars might have a 1964-66 style rear end, a 1968-72 rear end (which is wider, and commonly available), or a "hybrid" rear end, which will have the 58.5" width, but with the early spring mounting pad and trailing arm brackets. (Note: For what it's worth, ALL 67 rear ends I've ever seen were the narrow variety and used the spring cup like 68-72 but were narrower like the 64-66.)
 

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Very old thread I know..

But I'm wondering if a 65-66 differential housing will work
in a 70 chevelle.

I don't care about numbers matching..

I was thinking it might fit ...and perhaps allow a little wider tire under the fenders. May hit something else though?

Thanks...Stan
 

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Very old thread I know..

But I'm wondering if a 65-66 differential housing will work
in a 70 chevelle.

I don't care about numbers matching..

I was thinking it might fit ...and perhaps allow a little wider tire under the fenders. May hit something else though?

Thanks...Stan
Think about it. The maximum width of tire you can fit is dictated by the sheetmetal of the fender wells and the placement of the frame rails not the width of the axle. To get the maximum tire width in there, you just need to get wheels with the proper backspacing and rim width.
 

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Thanks for the post Rich....

You are exactly right..

However getting the proper BS is getting harder and harder these days ...especially with companies like Cragar.
Back space is dependent on the width of the rear end/axles...hence the question.
I was hoping someone had used the narrower early Chevelle rear end on a 70 with a easy to find BS wheel of some kind...that perhaps filled the wheel well better at the same time.

I need to know because I know where a early differential housing is at 1/3 the going price of the 68 and up Chevelle differentials. (I already have a extra posi carrier and gear set)

...and I don't won't to buy the rear end and experiment only to find out its not going to work well. I was hoping someone has already been down this road...and knew how well it did, or did not work, from having tried it.

We are using Weld wheels more and more these days because of he wider selection of wheels they manufacturer...but I don't like the wheels nearly as well as some others on the market.

Regards..Stan
 

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Stan,

The early rear will work. Just be sure to use the correct length upper control arms for 68-72s in your '70. You'll be able to run more backspacing, but maximum tire size will be the same.

The only potential issue is if you're running 98-02 F body rear disc brakes. The distance between the flanges & the shock mounts is shorter & will interfere with the parking brake levers. If not, no other clearance issues I can think of.
 

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Cragar used too...the last time I checked (last year) they didn't .

Yes its a 12 bolt...and too cheap I think...that's why I'm trying to make it work in my 70...lol!

Thanks...Stan
 

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The 64 to 67 Rearends are 60.0" wide with Drum Brakes from Driverside Wheel Mount Surface to Passengerside Wheel Mount Surface

If you are mounting the 64-67 / 60.0" Rearend at the same mounting points as a 68-72 / 61-62" Rearend would be

Do the following Measurements of your car with the current Rearend in it
with the curent Wheels/Tires removed from Both DR & Pass sides, one side at a time or all same time
measure the following;

1. Current Rear End Width – Face of Brake Drum/Disc Driverside to Face of Drum/Disc Passengerside = “
2.OUT SPACE from inside Lip of outside Fender to Face of Rear Drum/Disc Brake Hub/Wheel Mounting Pad
DR Side = “ PASS Side = ”
3.IN SPACE from Face of Rear Drum Brake Hub/Wheel Mounting Pad to Frame/Inner Fender
DR Side = “ PASS Side = ”
4.Total Wheel Well Space = # 2 + # 3 measurements #s
DR Side = “ PASS Side = ”
if one side is less then use it as the applicable number or make sure the Rearend is centered properly
5. Calculate 1/2 of the difference of the Current Rearend Width and the New Rearend Width = "
6. This should give you what the 2. OUTSPACE should be Increased by
and what the 3. IN SPACE should be Decreased by
7.Total Revised Wheel Well Space = # 6. 2. OUTSPACE + #6. 3. INSPACE measurements #s
DR Side = “ PASS Side = ”

Important things to NOTE;
1. the Rear Lower Shock Mount Bolt may interfere with the Wheel’s Rim
2. and yes your car's exhaust may interfer with the Tire on a 10" Wide Wheel
3. Type of Brake system on rearend, Drum or Disc ! as the Disc setup is usually wider than a Drum setup
4. Is Rearend centred ?
5. Has the car been Lowered ?
6. Side Wall/Section Width of the Tire = ?
7. Diameter Height of Tire = ?
8. Size of Wheel you wish run ?

Measure twice and you will only need to buy once the Wheels/Tires
you need to fit within your car’s Fenderwells with the Shorter/Earlier Chevelle Rearend.

Supply the above info and then I can calculate for you !
 

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Thanks for the offer Kirk..

I cant get all that right now...the car is in storage till after Christmas..

I was only asking if anyone had used one of the early rear end successfully with a standard bs wheel.
I can fit any wheel if it's available.
On many of the cars I've done ...what was needed was often not available in any wheel I cared for.
This car has stock 14 inch SS wheels with 245/60 14 BFG Radial TA's....and has 2" lowering spindles on the front.
I'm changing the rear gear...and just want to keep the old rear end "as is" for another car.
I'm thinking 15s with 70 series tires would help raise the car a little to the stance I prefer...and I will get rid of the lowering spindles for sure. I prefer a little perkier stance than lowered cars have.

thanks...Stan
 

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I'm thinking less back space...and a little deeper offset (dish) on the front side

...and no disc brakes on the rear...just stock drums.

Less backspace with a larger lip is what I meant. :thumbsup:
 

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There are plenty of wheel companies that make wheels with a custom backspace. The ones on my wagon are a perfect example and they weren't outrageously expensive.
I agree...just not what I'm looking for sometimes.
What wheels do you have on your wagon though..I dont see any pics?
 
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