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Old 10-02-2011, 10:14 AM
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8.5 10bolt question

are all the 8.5 10 bolt rear ends the same? i found one for a 9c1 cop car but i kno he bolt pattern is 5x5,can i switch axels to 5x4.75? can they also be shortened to work in a 1978 chevy malibu? has anyone ever done this before?
trying to find a grandnational rear or cutlass 442 rear is almost impossible or way too much money for a stock rear end and than add axles good posi gears etc!! any help would be great thanks
moe

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Old 10-03-2011, 04:44 AM
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Quote:
Originally Posted by CHUMPCHANGEBU
are all the 8.5 10 bolt rear ends the same? i found one for a 9c1 cop car but i know he bolt pattern is 5x5,can i switch axles to 5x4.75? can they also be shortened to work in a 1978 chevy malibu? has anyone ever done this before?
moe

The stock 78-88 G-body Rear width is:
58" Drum to Drum.
52.125" Housing Flange to Flange.

If your 9c1 Rear uses 28-Spline axles, you could shorten the Housing's Axle Tubes and use Stock or Aftermarket Axles for a 84-87 GN/GrandNational / T-Type / 442/HO. These Axles have 5" X 4.75" pattern.

A member on MonterCarloSS.com said someone makes the conversion UCA/UppercontrolArms for B-body to G-body Rear swap.

I think the B-body Rear is 3" wider than G-body, you could also use Rims with more Offset/BackSpacing if you don't want to narrow the Housing.

MikesMontes.com has a few 8.5" G-body Rears for sale. Last time He quoted $650 for an Open Diff Rear.
Also check 'For Sale' sections at:
Mailburacing.com
Turbobuick.com
Montecarloss.com

http://www.maliburacing.com/tech_rearend_swaps.html
http://www.maliburacing.com/rearend_guide.html
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Old 10-03-2011, 06:30 AM
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Quote:
Originally Posted by CHUMPCHANGEBU
are all the 8.5 10 bolt rear ends the same? i found one for a 9c1 cop car but i kno he bolt pattern is 5x5,can i switch axels to 5x4.75? can they also be shortened to work in a 1978 chevy malibu? has anyone ever done this before?
trying to find a grandnational rear or cutlass 442 rear is almost impossible or way too much money for a stock rear end and than add axles good posi gears etc!! any help would be great thanks
moe
I'm guessing you're aware of the 8.8 Ford diff swap that has been mentioned on several of the G-car forums. I don't know who exactly makes or sells the conversion parts needed- I'm not that far into this yet on my '80 Malibu wagon.

It's a crime GM didn't see fit to use the corporate 10-bolt in all of the G-cars, third gen F-cars and S-10's.
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Old 10-03-2011, 09:08 AM
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I wanted to do the 8.8 conversion,just have so many parts for a 8.5 just mo housing and it wouldn't make sense to so it. Thanks for the info anyway
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