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#1
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rear end?
what size rear end is in a 75 malibu? and will it fit in my 86 gn? my car only has the 7.5 someone snagged it along the line. so i am looking for the next best thing.any other cars you know of with 8.5 that will fit even with a little modifying. i am pretty good with a welder.
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#2
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Re: rear end?
1975 malibu is a 8.5 . The uppers are the widest control arm mounts out there on a GM rear. pretty tough to make them work. 1971 1972 skylark and cutlas rears were 8.5 and will be pretty good to do plus having bolt in axles is nice too. It will require the same mods as a 12 bolt chevy. upper conversion control arms and a bit of spring perch relocating also the shock mounts need some redrilling and or different add on plates to relocate that you can do yurself pretty easy. Hope that helps some. Jim
I am working on a 12 bolt GN rear as we speak. it will be for sale soon. 3.73 posi direct bolt in except for the upper control arms. the conversion arms will probably be sold with this rear as a package deal. Jim jdrace.com
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JIm Mitschke J D Race & Restoration Richfield, Oh |
#3
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Re: rear end?
I've got a rear axle from a 72 Skylark under my 86 GN. Same thing as what you are trying to do more or less. Only I think your overall length is way to wide with the 73-77 vintage A-body axle. I bought a kit from HPMotorsports in Omaha NE back around 1996. I couldn't find thier website but pick up a Fast Fords&Mustangs and they'll be in there. The kit was all 4 arms and new spring and shock mounts. You've got to do some cutting and welding. With my combo the axle tubes were 1.5" wider on each side. I made up the difference with some custom made wheels. I found I was able to stuff a 10" wide wheel and keep the rubber stuffed up under the sheet metal. I ended up with a 6.250 back space. I would imagine it would be more with your 75 axle. The kit from HP is to swap older A-body axles into a G-body. The arms are boxed and come with poly bushings.
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Eric Fisher OEM Parts Specialist. e-mail me at turbofish38@hotmail.com |
#4
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Re: rear end?
Eric lets see a pic of your setup
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#5
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Re: rear end?
I was interested in a cheaper alternative for a stronger rear end in the G-body so I decided to use the 64-72 A-body axle after one of the local Stock Eliminator guys told be how he stuffed a 65 12 bolt up under his 79 Malibu. The rear I picked is from a 72 Skylark I was using as a nuts and bolt car for my GS455. It is the B-O style that uses a pressed on bearing like a Mopar 8.750 or Ford 8/9". No need for C-clip eliminators as it doesn't use them. I had all of the rust and gunk removed by a local chemical stripper. The housing was soaked for 1 week until it looked like it was brand new. That is it in pic 2 before the spring and shock perches were welded on.Since this axle uses the standard GM 4 bolt flange I used some 11" drum brakes from a 77 ElCamino on it with some light weight drums. Notice the cooling fins aren't that large in pic 1.The stock park brake cables bolt right up with no mods needed.I went with drums becuase they needed to look stock for Solo2.Plus I can powerbrake the car up past 20 pounds if I want to. Pic 4 shows all of the hardware from HP Motorsports.Pic 5 shows the stock sway bar bolted to the box tube lower arm.Pic 3 shows the 72 rear with a stock 8.5 rear. Notice the difference in tube length. To build up the rear I used a boneyard 8.5 posi from a B-body wagon.Cost $25. I used a house brand 3.42 ring and pinion from Summit. Cost $135. The wheels are stock GN chrome steels widened to 10" with a 6.250 BS.Cost $125 each. The HPM swap kit is actually the second set they made. The first was a proto that was used to build the jigs. Since I was buddies with Paul Brown I just paid the cost of materials which was really nothing. Retail of the kit was around $300. A friend of mine welded everything up after I mocked the parts up in my garage.When I drag race the car I use some Weld 15X8 wheels with a 5" BS and a 10" wide slick. I'm using F-body springs cut down to lower the car over the tire combination. Since the roll center is a little off the 60' times are off by about .050-.100 seconds. With the wider rear track it handles like a slot car on rails.
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Eric Fisher OEM Parts Specialist. e-mail me at turbofish38@hotmail.com |
#6
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Re: rear end?
Here are some pics of how the rubber looks. When these were taken I was running a 285/40-15 tire on the 10" wide rear wheels. That size is non-existant today so I've been running anything from a 275/60 DR to a 265/50 Dunlap street tire on it. These sizes have a little taller side wall so I've had to raise the rear a little by stuffing another set of F-body springs in it.
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Eric Fisher OEM Parts Specialist. e-mail me at turbofish38@hotmail.com |
#7
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Re: rear end?
very nice info and pics.. im really diggin how far the wheels tuck under.. looks great !
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#8
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Re: rear end?
Quote:
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Steve Allen- '87GN "survivor" |
#9
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Re: rear end?
Quote:
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Eric Fisher OEM Parts Specialist. e-mail me at turbofish38@hotmail.com |
#10
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Re: rear end?
I think I actually found them from some metal sign maker outfit waaaaay back in the old days.
Can't remember, but they are pretty neat, huh?
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Ken Mosher 1987 GN original owner 650+ HP Black 2015 BMW 328xi XDrive wagon 2012 Volkswagen Tiguan (the Tig!) Night Blue Met (sold) 2006 Trailblazer SS Red Jewel Tint 395 HP AWD (sold) 2014 Silverado LTZ Crew 4WD 2012 Honda VFR 1200F Tahitian Blue (sold) 2015 BMW S1000R Racing Red 2013 Honda CBR500R Red (wife's bike) 2014 Triumph Bonneville T100 2003 Harley Davidson V Rod Anniversary Edition |
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