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Author Topic:   Rearends
chevyscrounger
Member
posted June 30, 2002 09:40 PM
We've got a '75 Malibu and we need to know what cars have a rearend that will work in this car.The one currently in it is a olds with bolt in axles and we would like to stay away from them because axles are too hard to find.
Can somebody give me a a list of rears that will work?


racer17j
Member
posted July 01, 2002 01:25 PM
can you run a ford 9 in if so i'd go with that but if it has to be gm you can find them all over the place just look for another one like it they made all kinds of rear ends that will work in those cars just have to pop the covers off and check then out i'd look for a older chevelle or monte


uforacing51
Member
posted July 01, 2002 02:01 PM
anything out of Buick, Chevy, Pontiac, from that year should work, that must be a different rear cause I have not heard of a car from that vintage with anything other than a 10 bolt with axles that c clipped in.


chevyscrounger
Member
posted July 01, 2002 02:14 PM
We can run Ford 9s but then we would have to rework i tfor the coils springs and control arms and then if it gets bent you did it all for nothing.
So any GM midsize from 73-77 should work?

The rear that we are using is not the original for the car I dont think. It might be older cause its got the cover like the old 12 bolts used to have with the oil slinger thing stamped into it.

[This message has been edited by chevyscrounger (edited July 01, 2002).]

tilley88
Member
posted July 01, 2002 09:35 PM
73-77 cutlass, grand prix, monte carlo, buick century, malibu; all 8.5 gear. Novas and camaro same size gear, but leaf spring. Others out there too, but eludes me at this moment.


ray14
Member
posted July 01, 2002 11:39 PM
i would use a 9" leaf setup might have to do little moveing of spring mounts but its no big deal.


BayouGent
Member
posted July 02, 2002 03:38 AM
Some full size newer models too...like Chevy caprice (before it was built to resemble a big turtle), possibly Olds 88 and 98, Pontiac Bonneville (before it was downsized and put on metric chassis), and I believe it was a Buick LeSabre all the way up to about '88. The full-size station wagons of these years had larger brake drums and backing plates on most that I've seen. I'm not sure if the axles were any bigger. All of those cars had 8.5 differentials. Oh by the way, don't throw that Olds rearend away with the bolt in axles because the drag racers like em. You might be able to sell it.


redneck bubbas racing
Member
posted July 03, 2002 01:16 PM
Lots of people actually prefer the bolt ins in my area. I ran one for two years but my housing got woreout and "wobbled" where the bearing rides so the bearings wouldn't last long. Any of the big cars from 73-77 will fit. The bolt ins are referred to as BOP at the parts store. You will find bolt ins in chevy cars, you will find c clips under BOP(buick,olds,pontiac), it all just depends on what they had on the line whenever they built them.


racer17j
Member
posted July 03, 2002 09:04 PM
gent your right the newer rear ends will bolt up but after 77 all rear wheel cars has 7.5 ring and pinions


chevyscrounger
Member
posted July 03, 2002 09:48 PM
Well week before last we got hit in the drivers side rear and bent the axle.So last friday night we made one lap in the heat race and the rear end let go. I was thinking that it jarred the weld loose in the spider gears and it got into the ring and pinion. (We were told when the car was bought that it had a mini spool and new richmonds.That was a lie.)When we took it out the housing is bent a little.
So this week we're putting in another rear(74 Camaro modified to fit a Metric car but had to relocate brackets to make it work in the non metric)


BayouGent,I can get the rear out of a 81 Caprice but we didnt know if it would work or not and if it was a 8.5. I can get it free.

So I know that the mid-sized cars from 73-77 will work and so will the 7X-90 or so full size cars will work too...

[This message has been edited by chevyscrounger (edited July 03, 2002).]

BayouGent
Member
posted July 04, 2002 12:12 AM
Racer17 we ran a rearend out of a '79 caprice and it had an 8.5 rear. All of the 7.5's I've seen are in the "metric" chassis cars. Now the Malibu did go to a metric chassis in '78. Back when I was working on "go straight" cars we used to take the wider and heavier duty 8.5 rearends out of cars like the caprice (even though they are a touch wider) and bolt them right up under the smaller Malibu's because the stock 7.5 rearends that came in the Malibu would not hold up in a drag car that made some decent power.


BayouGent
Member
posted July 04, 2002 12:21 AM
The '81 Caprice rearend will work in your car Chevyscrounger. The V-6 cars came with a lower gear ratio if you aren't looking to buy gears.


chevyscrounger
Member
posted July 04, 2002 08:07 AM
Thanks thats good to hear.


Gofastturnleft
Member
posted July 04, 2002 11:54 PM
gent it's not that i don't believe you got a 8.5 out of a caprice but it must not have been stock i have the catolog right here with me and heres what it has listed 7.5 10 bolt 77-up gm all models (exc.monza/vega/starfire)
82 up camaro/firebird
83-up s10/astro
the only 8.5's that where produced after 77 are camaro up till 82 and full size trucks


chevyscrounger
Member
posted July 05, 2002 01:56 PM
Didn't they put 8.5s in Buick Grand Nationals and T-Types in the 80s?
My dad says that the spring mounts on the Big cars is different than the 70s mid sizes but i don't know if thats true or not.


widebody
Member
posted July 08, 2002 11:19 AM
chevyscrounger you are correct 73-77 midsize and 78-9x b-body cars have 8.5" rears.My 92 caprice has a 8.5.
1/2 ton trucks also had 8.5" rears.
Just watch some of the caddys and H-D optioned cars(wagons) came with the semi-floater rears(the bearings press on and NO c-cips), these are not 8.5" rears, 8.2". They have a different shape cover, and the axle tubes look different behind the brake drum backing plate. All metric cars except buick GN had 7.5 rears, as do S-10s and chevy monzas.


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