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Old 01-08-2004, 01:41 PM
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Rear end for 79 malibu

i have a 79 malibu with a built 327 and 350 turbo trans but my rear end is the question it is the factory 7.5 10 bolt i wanna swith the factory gears to a 4.10 posi trac by using a spool, would you guys build this rear end or swap it with another and if so what rear ends would fit with little or no work?

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Old 01-08-2004, 04:50 PM
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Is this a street driven car? If it is, rebuild the stock rearend with a good POSI unit and a good set of gears. You will not like driving a spooled rear on the street... Don't do it.
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Old 01-08-2004, 04:54 PM
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You WON"T be driving a spool long on the street. It will be broken, or the axles will after a few corners.
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Old 01-08-2004, 05:32 PM
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Just about everyone who knows anything about axles will tell you what the previous posts have.
A spool is only practical for racing purposes where you want all the power to both wheels and won't be doing much turning.
A spool on the street will tear up a new set of rear tires pretty quick, and the 7.5 inch in your car won't last long with that spool and 327 giving it what it wasn't designed to handle.
Posi, limited slip, or whatever the manufacturers want to call it is the most sensible choice for the price and benefits of the unit.
If you plan on racing that car you might want to look for a 8.5 inch g-body rear (getting pretty scarce), of an A-body rear with the changeover bars, this one is around 2 inches wider at the axle flanges- so a different offset wheel will be the only change necessary.
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Old 01-09-2004, 01:11 AM
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If your looking to get a limited slip unit on the cheap, here`s what I did. I have a 86 olds cutlass supreme, it has the same 7.5 inch rear, I got a rear out of a 83 Firebird T/A with posi and 3.23 gears, all I did was swap the guts to my cars rear, added a bottle of GM limited slip anti chatter lube and have been running it ever since. I later did this same thing to a friends 82 cutlass, however, we looked in 4 junkyards and 32 different F-body`s before we found one, we would jack up the passengers side rear and use sand paper and WD40 to sand off the rust on the front passenger side axle tube to expose the code and compared it to our notes, I`ll leave the codes here, 82 - 87 camaro Z28 and firebird T/A`s, after 87 they used a aussie rear, which won`t interchange.
Year Code Ratio
1982 2JR 3.42:1
1982 2JY 3.08:1
1982 2JZ 3.23:1
1982 2PZ 3.23:1
1982 2PY 3.08:1
1983 4JQ/5JQ 3.73:1
1983 4JR/5JR 3.42:1
1983 4JY/5JY 3.08:1
1983 4JZ/5JZ 3.23:1
1983 4PQ/5PQ 3.73:1
1983 4PY/5PY 3.08:1
1983 4PZ/5PZ 3.23:1
1984 6EF 3.42:1
1984 6EP 3.42:1
1984 6JQ 3.73:1
1984 6JR 3.42:1
1984 6JY 3.08:1
1984 6JZ 3.23:1
1984 6PQ 3.73:1
1984 6PY 3.08:1
1984 6PZ 3.23:1
1985 8JP 3.08:1
1985 8JQ 3.23:1
1985 8PP 3.08:1
1985 8PQ 3.23:1
1985 8PR 3.42:1
1985 8PS 3.73:1
1986 2H5 3.73:1
1986 2HT 2.73:1
1986 2HV 2.73:1
1986 2HY 3.23:1
1987 2HQ 3.23:1
1987 4HF 3.08:1
1987 4HY 3.23:1
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Old 01-09-2004, 04:27 AM
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EXCELLANT! Good info DV... Thanks
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Old 01-09-2004, 10:51 AM
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thanks for all the help guys, and yes this car will see limited street use, also i have a 9 inch ford how hard and how much would it cost to narrow it to fit, because one of my friends has a 68 firedbird with a chevy 454 and 400 turbo he has a 9 inch ford with 3.89 gears and he has a spool in it and drives it on the street quite a bit
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Old 01-09-2004, 02:27 PM
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Quote:
Originally posted by 79 Malibu327
thanks for all the help guys, and yes this car will see limited street use, also i have a 9 inch ford how hard and how much would it cost to narrow it to fit, because one of my friends has a 68 firedbird with a chevy 454 and 400 turbo he has a 9 inch ford with 3.89 gears and he has a spool in it and drives it on the street quite a bit
Or he has a posi, or locker and is lying to you. More likely the case.
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Old 01-10-2004, 08:12 AM
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Quote:
Originally posted by 79 Malibu327
thanks for all the help guys, and yes this car will see limited street use, also i have a 9 inch ford how hard and how much would it cost to narrow it to fit, because one of my friends has a 68 firedbird with a chevy 454 and 400 turbo he has a 9 inch ford with 3.89 gears [COLOR=red]and he has a spool in it and drives it on the street quite a bit[/COLOR]
Malibu...
Does your buddies car squeal the rear tires when doing a slow tight turn in a parking lot? If it does he is running a spool. If not, the car has a limited slip posi unit. If there is a spool present watch the inside rear tire during a turn and you will actually see the tire spinning trying to keep up with the outside tire... Even if he has a spool don't follow him over the cliff just because he jumped... Spools are not intended to turn corners. They put the rear axle and tires in a bind EVERY time you turn because the outside tire wants to turn faster then the inside tire. This puts a massive REVERSE twisting motion on the axles and spool and is very hard on them. It's also very dangerous when going around corners in the rain as the car can go sideways at a moments notice... I really don't think you want that to happen...
As far as doing the 9"? You really won't hurt the stock rearend if you put a good posi and gears into it. It's plenty stout for your 327.... and it's much cheaper to rebuild then replace.
Mark
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Old 01-10-2004, 11:12 PM
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The guys here gave you very good advice.

If it is an 7.5" rear end it will not live long with a spool.

Spools have NO place on the street. As mentioned above corners will cause a bind that usually ends up breaking an axle or the spool. It might not happen on the first corner but sooner or later it is going to break something. The problem is even worse if you have sticky tires.

Spools are meant for drag racing or dirt circle track racing.

A 9" is a great rear end, but if you can hop up your 7.5" it should live. You may also want to look for an 8.5"GM 10 bolt. They are very strong and cheap. I don't know what donor cars will have them to bolt into your car.
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Old 01-10-2004, 11:40 PM
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Actually, your 79' should have a 8.5" ten bolt not a 7.5" ! Check to be sure! I think that most malibu's had the larger rearend and all V8 cars came with the 8.5! If it is an 8.5 just add a posi and gears and have fun!
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Old 01-11-2004, 12:53 AM
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Unless all my researching was wrong, along with many websites, and automotive parts stores and their parts books too, the 78-87 G-bodies came from the factory with a 7.5-inch ring gear 10-bolt EXCEPT certain models with certain equipment.

The Buick Grand National came with the 8.5-inch 10-bolt.
Some (NOT ALL) Monte Carlo SS cars came with the 8.5.

More than 90 percent came with the 7.5 inch.
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Old 01-11-2004, 12:39 PM
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I'm sure that you're right M&M! I guess that I just didn't realize they put the 7.5 the malibu's. I have had a number of 75' to 79' nova's though and all were 8.5's. I was just using the analogy whats good for the nova must be good for the malibu! Sorry
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Old 01-11-2004, 12:51 PM
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Re: Rear end for 79 malibu

Quote:
Originally posted by 79 Malibu327
would you guys build this rear end or swap it with another and if so what rear ends would fit with little or no work?

I suggest finding a Monte Carlo SS with a 3.73 and installing the complete rear end.......

With a 14 inch tire your would be close to your desired ratio and will NOT have spent a lot of money......plus it should bolt in....


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Old 01-13-2004, 05:10 PM
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do you think an 8.5 would be easy to find? were any of them posi? as far as the gear ratio im going to have at LEAST 4.10 cause of the engine and rpms im going to be turning with it
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