Differences between 8.2 and 8.5 10-bolt rear axles - Chevelle Tech
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Transmission & Driveline Transmissions and Differentials

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  #1  
Old May 11th, 10, 5:58 AM
4strokeforce 4strokeforce is offline
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Default Differences between 8.2 and 8.5 10-bolt rear axles

I'm thinking of buying a differential that is made for an 8.5 10-bolt rear axle. Now I'm having an 8.2 10-bolt rear axle and wonder if it's possible to convert this axle to an 8.5?

Do you guys know if it's possible to do this and which parts to use?

If it's better to look for a complete 8.5 rear axle, which years and models will fit an El Camino -69?
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Old May 11th, 10, 9:38 AM
Lionel-n-Chevelles Lionel-n-Chevelles is offline
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Default Re: Differences between 8.2 and 8.5 10-bolt rear axles

You can not istall a 8.5 Posi Unit into a 8.2 Housing.
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Old May 11th, 10, 2:02 PM
4strokeforce 4strokeforce is offline
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Default Re: Differences between 8.2 and 8.5 10-bolt rear axles

Ok. Do you know if there are any 8.5" rear axles that is a direct fit to an El Camino -69?
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Old May 11th, 10, 2:45 PM
4strokeforce 4strokeforce is offline
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Default Re: Differences between 8.2 and 8.5 10-bolt rear axles

I have found an 8.5" rear axle from a Chevelle at a good price (not sure which year model). Could that fit my car if the year model is correct? I'm worried about if the mountings could have been changed during the years.
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Old May 11th, 10, 3:59 PM
novaderrik novaderrik is online now
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Default Re: Differences between 8.2 and 8.5 10-bolt rear axles

some say that there is a Chevy 8.5 housing that bolts into a 68-72 Chevelle frame, but i've never seen one. there are BOP 8.5 housings that were used in olds 442's and what not, but i don't think that the internal parts are the same as the later 8.5.
the 8.5 was put in every Chevy badged A body starting in 73 when the car was totally redeisgned, but that suspension is totally different.
do you have any 80's Ford Mustangs or Thunderbirds with 5.0 V8 engines around there? if so, it might be possible to put the 8.8 rear end from one of those in your car. the mounting points on the center section are similar to a 78-88 G body- which is similar to a 64-72 A body. it won't be a true bolt in deal, but you'd get all the strength of a GM 12 bolt with cheap and easy parts availability.
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Old May 11th, 10, 6:29 PM
big gear head big gear head is offline
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Default Re: Differences between 8.2 and 8.5 10-bolt rear axles

There were 8.5 10 bolt rear ends installed in '71 and '72 A body cars, mostly the Cutlass and Skylark. These 8.5 rear ends had bolt in axles instead of c clips, but the internal parts are the same as the other 8.5 rear ends. The '73 and later 8.5 will not fit your car.
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Chevelle Tech > Mechanical > Transmission & Driveline      Current Topic: Differences between 8.2 and 8.5 10-bolt rear axles
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