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Old 09-11-2007, 10:03 AM
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8.2 or 8.5 ??

Does it really matter if i get an 8.2 instead of an 8.5? According to nova resource chevy also made a 8.875 or 8 7/8 but i dont recall seeing gears in jegs for an 8/78. Funny thing is the guy at the yard i found this rear end at told me it was an 8.5 out of a 70 nova. And according to nova resource the 70 nova did not have an 8.5 as an option. If i get the 8.2 i am looking at 4.11 gears posi of course and some where in the neighborhood of 400 - 500 HP.

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Old 09-11-2007, 01:56 PM
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There are plenty of gears for the GM 8.875 available. I would use the 12 bolt with the kingd of HP you are talking about.
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Old 09-12-2007, 08:16 AM
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Does this mean that the 8.875is a 12 bolt? The guy said its a 10 bolt so then if thats correct it must be an 8.2. The guy on spikes muscle car show said its too hard to find the 8.5 so he went with the 8.2 and if i remember right he said there wasnt much difference between the 8.2 and 8.5. If im having a hard time finding an 8.5 im sure i wont find a 12 bolt. Thing is the 8.2 is right about a 1/4" smaller then the 8.5 i dont see that as being that much of a difference i mean its not as big a difference as it is to the 7.5. And even the 7.5 some guys have had luckwith it but from what i got out of that post was dont take the chance on the 7.5 its too much of a crap shoot. Imjust wondering howmuch of a crap shoot the 8.2 would be if at all.
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Old 09-12-2007, 03:18 PM
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8.2 and 8.5 are both 10-bolts. The 8.875 is a 12-bolt. Finding a 12 bolt for a Nova will be huge bucks. The 8.5 can be beefed up nicely and will take tons of power in a light car like a Nova. The 8.2 is a fine rear axle but parts are getting scarce.
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Old 09-13-2007, 08:20 AM
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Thanks for your input curtis. What part are getting scarce? If your referring to ring and pinions and the like i want new stuff anyways and jegs has several selections. What drive shaft do you guys think i would need? I have 2 from the 7.5 and i have 1 for the 8.5 i hope 1 of these will fit. I would hate to have done all that hunting for drive shafts to not put them to use.
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Old 09-14-2007, 02:18 AM
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I'm sure you can still find parts, but I remember searching high and low for a simple cover gasket. I don't think anyone makes bearings for them anymore but they're still on shelves here and there.

Its not that parts are non-existent, but it is an old design that hasn't been used for decades. The 8.5 is still in use and parts are super easy and cheap. I was just trying to steer you away from building up a strong 8.2 only to find you spent three times as much only to have an 8.2

The 8.5 is just so common and plentiful that parts are dirt cheap.
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Old 09-14-2007, 07:33 AM
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I appreciate that Curtis73, And i am happy to report that i found an 8.5 When i got to the yard the guy said he wasnt sure what it was and so i told him it was an 8.2. He then steered me to a 8.5 out of a 75 or 76 cadillac so i took the measurements and everything checks out. So as soon as i get my rug rat off to school imgoing to pick it up. I dont have anyone around to help me get it off the rented trailer so im going to try to use my engine hoist i think i will be fine with that. The only thing is the out put shaft is different it has the type of the CV joint. Flat plate with several holes for bolts in it. I was told when i go to pick it up he will have a new output for me the yoke style. so all i should have to do is remove the pinion nut pull off the old one and put on the new one. Thank GOD i bought the correct drive shaft on ebay for $6.00 when i had the chance. So it looks like im golden on the rear end situation. And thanks to everyone for there help and advice.
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Old 09-14-2007, 12:37 PM
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Gotta love junkyard scores. Congrats.
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Old 09-14-2007, 03:47 PM
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The 8.5 is suppose to be a pretty decent unit. From what I understand you want to stay away from the ones that have the later Gov-loc limited slip or what ever it's called.

Have yout thought about a Ford 8.8? Tons of them around. The Explorer versions are 5 lug and a lot have discs. The 8.8 is a pretty tough unit. My understanding is that it's actually a close copy of the Chevy 12 bolt. I've heard that even some of the bearing interchange.
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Old 09-14-2007, 06:41 PM
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8 7/8th's " is a 12 bolt truck 30 spl axles 5 or 6 lug was used from 69-92 i believe ...and much easier to find than a 12 bolt out of a car.....
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Old 09-18-2007, 02:44 AM
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Car and truck 12-bolts are both 8-7/8", but are different designs. If you need an 8.5" for a '77 Nova, just get one from a '73-'79 Nova or clone. You'll likely play hell getting anything else to fit without major mods or fit hassles, and they are not rare at all.
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Old 09-18-2007, 07:12 AM
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Quote:
Originally Posted by tinman386
I appreciate that Curtis73, And i am happy to report that i found an 8.5 He steered me to a 8.5 out of a 75 or 76 cadillac so i took the measurements and everything checks out. So as soon as i get my rug rat off to school im going to pick it up.The only thing is the out put shaft is different it has the type of the CV joint.
Thanks Jimfulco. The 8.5's from a nova around here is very hard to find or i didnt know where to look. Not to mention the price guys are wanting is crazy. I was shocked to seethat the caddy rear is identical to the nova minus the out put. Which he said he would get me and include in the price.
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Old 09-18-2007, 08:51 PM
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Might be a late-'70s Seville rear, which is similar to a Nova, but check and see if the wheel bolt pattern is the same. Some of the Sevilles from back then used the larger 5-on-5" pattern, although that may have just been the disc-brake cars.
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Old 09-19-2007, 10:46 AM
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Wheel bolt pattern is the same. This came out of a 76 seville. The only thing different is the brakes. The 7.5 had a 7.5/8" drum while the 8.5 rear has the 11.00" drum. I can switch the backing plates and run nova brakes if i want to cuz the mounts for that is also the same. But im thinking the 11.00" drums might be a better choice. I already bought all i need for rear brakes for the 7" drums except the drums. But i think i will just re ebay them and get the 11.00" stuff Its only $132.00 tax included for everything including the wheel cylinders and drums. I dont see how i can go wrong there. Now i just have to get the yard to pull an out put knuckle for a u joint and not a cv joint as it had on it when i bought it. Do you think the 11.00" brakes will work ok with the same master cylinder ive got?
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Old 09-24-2007, 10:52 PM
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Probably so. The 11" rear drums were used on some old Malibu wagons, and the sedans with 9.5" drums used the same master cylinders that the wagons did. I imagine there might have been a difference in the way the proportioning valves were calibrated, but I can't say for sure.
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