4th gen rear axle into a 3rd gen?? - Team Camaro Tech
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  #1  
Old Feb 2nd, 07, 08:53 PM
Boosted_SS Boosted_SS is offline

Rich
 
Join Date: Feb 2007
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Default 4th gen rear axle into a 3rd gen??

hey everyone i have a question i was hoping you all could help me with. i am thinking about swapping out my 3rd gen rear end for a 4th gen rear end. will it fit without modifications? i have an 88 camaro with rear drums and i was hoping to get the rear disc brakes and still have parts easy to find. also i have done some work to the stock rear end (GM 3.73 gears and an eaton pro posi unit) will the ring and pinion and the posi bolt into the unit from the 4th gen? i know the axles are very similar. will i have to get a new brake master cylinder? any thoughts would be extremely helpful. thanks guys!

Rich
rbowers403@zoominternet.net
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  #2  
Old Feb 2nd, 07, 08:57 PM
WildBillyT WildBillyT is offline
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Bill
 
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Default Re: 4th gen rear axle into a 3rd gen??

It will stick out, I think the 4th gen rears are 1" longer.
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  #3  
Old Feb 2nd, 07, 09:01 PM
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BonzoHansen BonzoHansen is offline
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Default Re: 4th gen rear axle into a 3rd gen??

If you have a 10-bolt and the 4th gen rear is a 10-bolt, the brake package should be able to transfer over.
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  #4  
Old Feb 2nd, 07, 09:06 PM
Boosted_SS Boosted_SS is offline

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Default Re: 4th gen rear axle into a 3rd gen??

Quote:
Originally Posted by BonzoHansen View Post
If you have a 10-bolt and the 4th gen rear is a 10-bolt, the brake package should be able to transfer over.
yes it's the stock 10 bolt. believe it has the 8.5" ring gear and 26 spline axles. basically i want to buy one from the junk yard and take my gears and posi out of my axle and transplant them into the axle from the junk yard and bolt it into my car and hook up the disc brakes.
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  #5  
Old Feb 2nd, 07, 09:17 PM
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BonzoHansen BonzoHansen is offline
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Default Re: 4th gen rear axle into a 3rd gen??

3rd & 4th gen rears are not 8.5"

Why are you looking to do it the hard way? Just pull the axles, unbolt the drum backing plates, bolt on the disc brackets, reinstall the axels. You just have to get the disc brackets off a 10 bolt rear if you have a 10 bolt rear, the flange is the same (also same on 8.5 a bolt, 12 bolt) but not the 9-bolt 3rd/4th gen rear.
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  #6  
Old Feb 2nd, 07, 09:31 PM
Boosted_SS Boosted_SS is offline

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Default Re: 4th gen rear axle into a 3rd gen??

Quote:
Originally Posted by BonzoHansen View Post
3rd & 4th gen rears are not 8.5"

Why are you looking to do it the hard way? Just pull the axles, unbolt the drum backing plates, bolt on the disc brackets, reinstall the axels. You just have to get the disc brackets off a 10 bolt rear if you have a 10 bolt rear, the flange is the same (also same on 8.5 a bolt, 12 bolt) but not the 9-bolt 3rd/4th gen rear.
OOOO OK! so if i get the 10 bolt axel from a 4th gen the brake package will bolt right onto the 10 bolt from the 3rd gen?that would be sweeeeeeet!!!! it would make my life ALOT easier! LOL what size is the ring gear on the 10 bolts? sorry it's been about 7 years since i did the rear end and i forget lol

also will i have to change the brake booter, master, or the proportioning valve?
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  #7  
Old Feb 2nd, 07, 09:33 PM
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Default Re: 4th gen rear axle into a 3rd gen??

~7.5
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  #8  
Old Feb 2nd, 07, 09:35 PM
Boosted_SS Boosted_SS is offline

Rich
 
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Default Re: 4th gen rear axle into a 3rd gen??

also will i have to change the brake booter, master, or the proportioning valve?

so to make sure this is correct the brakes just unbolt and are interchangeable from the 3rd gen drum and 4th gen disc?
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  #9  
Old Feb 2nd, 07, 09:37 PM
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BonzoHansen BonzoHansen is offline
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Default Re: 4th gen rear axle into a 3rd gen??

Get a 3rd gen disc/disc master & prop valve.
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  #10  
Old Feb 2nd, 07, 09:38 PM
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BonzoHansen BonzoHansen is offline
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Default Re: 4th gen rear axle into a 3rd gen??

Also, search around www.thirdgen.org

http://www.thirdgen.org/techboard/brake-board/
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  #11  
Old Feb 2nd, 07, 09:50 PM
Boosted_SS Boosted_SS is offline

Rich
 
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Default Re: 4th gen rear axle into a 3rd gen??

you sir are the effin man!!!
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  #12  
Old Feb 3rd, 07, 12:01 AM
novaderrik novaderrik is offline
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Default Re: 4th gen rear axle into a 3rd gen??

i could be wrong, but i think all the drum brake 3rd gen Camaros with drum brakes used the same axle flange as the "G" bodies- Monte SS, Regal, etc. this is an oddball flange that is unlike any other rear axle- but i have read of people using the disc brake bracket as a template to drill the proper mounting holes for the disc brakes. the only 3rd gens with factory rear disc brakes had the oddball Borg Warner rear axle with a totally different axle flange, and not the 7.5.
all the 4th gen rears had the standard 10/12 bolt axle flange, and got upgraded to a slightly larger 7 5/8" ring gear.
also, i think they went from 26 spline axles to 28 spline with the switch to the 4th gen in 93.

so, if it actually works, get the rear disc stuff from a newer Camaro- or an S10 Extreme- and modify the axle flange to accept it.
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  #13  
Old Feb 3rd, 07, 03:08 PM
Boosted_SS Boosted_SS is offline

Rich
 
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Default Re: 4th gen rear axle into a 3rd gen??

actually upon further research it seems as though 87+ is 7 5/8 and 28 spline axles so they should be interchangeable. i hope! LOL i'm going to try and talk to the mechanic who does the rear ends at the local dealership to confirm this but the i looked up the eaton posi unit for an 88 camaro with a 10 bolt and a 95 camaro with a 10 bolt they were the same part number so i would assume they are interchangeable. i liked the idea of just switching out the brakes and leaving the original axle. has anyone actually tried this? if not the 3rd and 4th gen axles are interchangeable with no modifications correct?
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  #14  
Old Feb 3rd, 07, 07:28 PM
Boosted_SS Boosted_SS is offline

Rich
 
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Default Re: 4th gen rear axle into a 3rd gen??

is it possible to completely unbolt the brake assembly (backing plate, caliper mounting bracket, calipers, rotors, etc) from the 4th gen rear end and bolt it directly onto a 3rd gen rear after removing the entire drum assembly? will the mounting holes line up? or if that isn't possible to do is it possible to do it with the disc brake assembly from a 91-92 camaro which i hear are the same? has anyone done this?
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  #15  
Old Feb 3rd, 07, 08:27 PM
blue89bird blue89bird is offline
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Jason
 
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Default Re: 4th gen rear axle into a 3rd gen??

4th gen rear ends are 1.5" longer on each side
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