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#1059750 - 11/08/18 02:30 PM Re: Looking for a 8.5" rear from a Grand National [Re: Ryan Bequette]  
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Originally Posted by Ryan Bequette
I have a 7.5" that I picked up off Facebook marketplace for $250. Replaced the bearings, it is running behind a hopped up 305 with a t5 trans. With my current valve-train setup, I shift at around 7000 rpms. It will cut the 255's out back loose in 2nd gear. Haven't had any issues.

I'm building a 377 this winter that should be a 8000 rpm monster and am still debating on a 12 bolt swap or just keeping the 7.5. Not a fan of low end torque, I like high rpms.

As with the driveshaft, when I had mine balanced, the machine shop tec told me that the weak spot is the U-Joint, upgrading to a 3 or 3.5" driveshaft will make no difference with the stock U-Joints. The break will happen at the U-Joint regardless. Now this was coming from the technician at the machine shop. Not my opinion.

BTW, if you have Facebook and haven't checked out their marketplace setup, please do so there are a ton of sellers on it!!!!!

I couldn't give my perfect condition, open 7.5" away on Facebook marketplace. I scrapped it two weeks ago, too bad you could have had mine for free..(shipping would be the big problem)


86 MCSS Notchback coupe, LS3, 4L65E, QP 9", Eaton Truetrac, 4 wheel disc, column shift, Dakota Digital, silver with maroon bench interior

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#1059757 - 11/08/18 06:20 PM Re: Looking for a 8.5" rear from a Grand National [Re: Luis087]  
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Originally Posted by Luis087
Hello,
does any one know some one that is selling a 8.5" rear end from a Grand National ?

The supply is drying up.....the few that you will find will be worn out and priced obscenely high.

Have you considered a fox body 8.8 rear?

Last edited by 86SS86LS; 11/08/18 06:22 PM.
#1059758 - 11/08/18 06:30 PM Re: Looking for a 8.5" rear from a Grand National [Re: PB86SS/87LS]  
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Originally Posted by PB86SS/87LS
Depends on posi or not, or if work has been put into it i.e. freshened up, etc. I would say the cheapest is the $700-800 range for non posi, anything posi will be 1,000-1,200 or more if it is really clean or been gone through.


^This is about right. I sold an open 8.5" last year for $700. I had more calls and emails on this than anything I've ever sold on Craig's list....wish I had a dozen of them to sell.

#1059761 - 11/08/18 07:13 PM Re: Looking for a 8.5" rear from a Grand National [Re: thepezking639]  
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Originally Posted by thepezking639
Originally Posted by MC96
In the spirit of differing opinions, I built my 9" from scratch using a borrowed currie jig and had about 1200 or so total into it, with wilwood brakes. Sold it for 1500 this spring.

Seriously considering building a jig and making them myself......


I mean if you feel like making a jig to Narrow a 8.8 S197 rear let me know.



The jig is pretty simple (especially the narrowing part) just takes money, once I have the shaft I just need aluminum pucks to match housing end bearings and carrier bearings.

I will think more seriously about it once my welder is fixed. Feel free to PM me, you arent far away either.


86 SS
400SBC, 4l80e, MSD Atomic injection/trans controller, Tilt glass clip, all tubular arms, corvette brakes, 9" rear
In progress
#1059762 - 11/08/18 07:16 PM Re: Looking for a 8.5" rear from a Grand National [Re: 86SS86LS]  
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@86SS86LS , I have not looked into it. I found a few 8.5's , but i really can't trust by simply looking at pictures. I have requested a short video to proper inspection the rear end , but the out of state sellers have not replied.Also, they are asking 1100 for non posi and 1500-1700 on posi. super ridiculous ! plus another 200 to 400 on shipping, so I need to get the price right.

#1059764 - 11/08/18 07:51 PM Re: Looking for a 8.5" rear from a Grand National [Re: Luis087]  
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There are kits available to make a non 4 link 8.5 adaptable into a g body. If someone wanted to stay GM but didnt mind a non factory look.

There are a few available rears that are a little wider that would be nice for 4th /5th gen camaro wheels or vette wheels or narrower. as far as I know the G bodies are one of the few cars to deviate from the traditional 10/12 bolt housing end flange, picking something with a standard flange would open up your brake options as well.


86 SS
400SBC, 4l80e, MSD Atomic injection/trans controller, Tilt glass clip, all tubular arms, corvette brakes, 9" rear
In progress
#1059765 - 11/08/18 07:54 PM Re: Looking for a 8.5" rear from a Grand National [Re: Luis087]  
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MC96 Offline
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Also stepping back, for my money in a street car, if I were to do it again I would have an 8.8. Im sure by now someone has gm pattern axles available off the shelf for them.


Sorry to derail your thread OP.

Have to say when I first read your post title my response was "who isnt" but they are out there.


86 SS
400SBC, 4l80e, MSD Atomic injection/trans controller, Tilt glass clip, all tubular arms, corvette brakes, 9" rear
In progress
#1059770 - 11/09/18 05:17 AM Re: Looking for a 8.5" rear from a Grand National [Re: Luis087]  
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Originally Posted by Luis087
@86SS86LS , I have not looked into it. I found a few 8.5's , but i really can't trust by simply looking at pictures. I have requested a short video to proper inspection the rear end , but the out of state sellers have not replied.Also, they are asking 1100 for non posi and 1500-1700 on posi. super ridiculous ! plus another 200 to 400 on shipping, so I need to get the price right.


At those prices, I would take a hard look at the 8.8. I'm considering an 8.8 from an 02 mustang GT for my 86SS.....with the price of the rear.....I should have right around $600 into it.

#1059772 - 11/09/18 02:49 PM Re: Looking for a 8.5" rear from a Grand National [Re: Luis087]  
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Originally Posted by Luis087
@86SS86LS , I have not looked into it. I found a few 8.5's , but i really can't trust by simply looking at pictures. I have requested a short video to proper inspection the rear end , but the out of state sellers have not replied.Also, they are asking 1100 for non posi and 1500-1700 on posi. super ridiculous ! plus another 200 to 400 on shipping, so I need to get the price right.

Glad to hear you are being cautious, scammers know the 8.5 is scarce and in demand and will no doubt try to pass off a 7.5 as the real deal. The lack of cooperation from the seller to provide a video is a red flag. If it were me, I'd make a road trip to pick one up, too much money involved to simply trust online sellers. Road trip eliminates the hassle of figuring out the shipping.


86 MCSS Notchback coupe, LS3, 4L65E, QP 9", Eaton Truetrac, 4 wheel disc, column shift, Dakota Digital, silver with maroon bench interior

[Linked Image]
#1059773 - 11/09/18 02:50 PM Re: Looking for a 8.5" rear from a Grand National [Re: 86SS86LS]  
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@86SS86LS, Would it take a whole lot of fabrication if I was to go through that route?

#1059774 - 11/09/18 03:28 PM Re: Looking for a 8.5" rear from a Grand National [Re: upflying]  
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Originally Posted by upflying
Originally Posted by Luis087
@86SS86LS , I have not looked into it. I found a few 8.5's , but i really can't trust by simply looking at pictures. I have requested a short video to proper inspection the rear end , but the out of state sellers have not replied.Also, they are asking 1100 for non posi and 1500-1700 on posi. super ridiculous ! plus another 200 to 400 on shipping, so I need to get the price right.

Glad to hear you are being cautious, scammers know the 8.5 is scarce and in demand and will no doubt try to pass off a 7.5 as the real deal. The lack of cooperation from the seller to provide a video is a red flag. If it were me, I'd make a road trip to pick one up, too much money involved to simply trust online sellers. Road trip eliminates the hassle of figuring out the shipping.


Alot of sellers probably don't want to bother with shipping something that size, might be one reason no one will take a video. The seller should still respond but if it was me I'd probably state pickup only, especially for a 8.5" when there is going to be a lot of demand. Any larger items like that that I've had(never had a 8.5" to sell, but trans/rear ends) are pickup only, sure they can be shipped but more of a hassle than it's worth when you have people locally or who will drive to pick it up.


-86'SS 383 CCC QJet- BRF 2004r-8.5" 3.42 -313/344@RW - 13.35 @103
-87'LS 350 MAF/SD TPI- CRF 2004r-7.5" 3.42 -248/340@RW - 14.55 @ 96
-07'TBSS Stockish daily driver
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#1059783 - 11/10/18 11:22 AM Re: Looking for a 8.5" rear from a Grand National [Re: Luis087]  
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Originally Posted by Luis087
@86SS86LS, Would it take a whole lot of fabrication if I was to go through that route?

I have not actually done one.....but for those that have, the trick chassis kit is popular. Looks like you weld spring perches on the axle and a pair of brackets to the frame.
https://trickchassis.com/index.php?..._control_arms-no/weld_on_spring_perch-no


Southside Machine has an explorer 8.8 kit. This would be ideal since explorer rears or cheap and plentiful....as well as being stronger than mustang rears (28 spline vs 31). However I haven't seen anyone w/o has actually used their kit.
https://southsidemachineperformance.com/products/explorer-88-swap-kit

#1059821 - 11/13/18 07:35 PM Re: Looking for a 8.5" rear from a Grand National [Re: Luis087]  
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@86SS86LS, Thanks for those links..

Thanks to all of you that replied.

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