Rear End Help!

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Rear End Help!

Postby gearheadmike » Sun Mar 17, 2019 11:41 am

Looking for some info on the early 6.5 rear end i need to find out the brake backspacing. I believed it to be 2-1/4" I narrowed my 6.5 for a project but the info and measurements i wrote down got damaged and illegible to read. Also i believe the overall rearend width was 54-1/2"
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Re: Rear End Help!

Postby 283vega » Sun Mar 17, 2019 3:01 pm

I think you are right about the overall width. The brake backspacing I am unsure of what you want. Also that measurement could vary depending on the year 6.5 you have. The drums went from 2" to 2 1/4 in 76 I think. Someone else please jump in and verify.
283 vega
70 corvette


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Re: Rear End Help!

Postby gearheadmike » Sun Mar 17, 2019 3:30 pm

The backspacing measurement from the outside axle flange to the inside of the flange welded to the rear-end. My rear-end stamped # is HAC 259 2
I'm 90% sure this is pre 75.
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Re: Rear End Help!

Postby cjbiagi » Sun Mar 17, 2019 4:38 pm

The 1975 and earlier rearends had the small 1 1/4" x 9" brakes. In 76 all H bodies went to the more common GM 2" x 9.5" brakes. I do not know about the back spacing measurement.
Clyde.........75 Monza 2+2
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Re: Rear End Help!

Postby Smiley » Sun Mar 17, 2019 5:17 pm

Are you ordering new axles or looking to put different brakes on it?
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Re: Rear End Help!

Postby gearheadmike » Sun Mar 17, 2019 6:52 pm

Getting them resplined through Moser. I removed 6+ inches off each side so i'm out of the spline area with plenty of meat to respline ithem.
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Re: Rear End Help!

Postby hammerdown7 » Sun Mar 17, 2019 8:23 pm

What are you using this for, it's a very weak rear end if you are changing engines.
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Re: Rear End Help!

Postby gearheadmike » Sun Mar 17, 2019 9:04 pm

I know it's a wear rear but right now with a budget it'll have to work as i'm only into it for $30 plus the $125 for re-splinning.
Its going in a 1500-2000 lb car with a s10 2.2 4cyl with skinny tires.
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Re: Rear End Help!

Postby hammerdown7 » Sun Mar 17, 2019 10:12 pm

That should be okay, the 2.2 and the stock Vega engine have about the same torque. Just didn't want you to put in a V8 and waste your money having the work done on it.
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Re: Rear End Help!

Postby Smiley » Thu Mar 21, 2019 3:39 am

Put the drum over the backing plate, measure through the center and add 1/8”
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