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Old 12-19-2013, 04:26 PM
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Clear answer 8inch vs 9inch

Can you tell if this is an 8 or 9 inch???
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Old 12-19-2013, 05:23 PM
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not from that picture.
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Old 12-19-2013, 05:29 PM
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This any better?
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Old 12-19-2013, 05:39 PM
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hard to see but it looks like a 8 as it is missing a bolt
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Old 12-19-2013, 05:43 PM
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8".................
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Old 12-19-2013, 06:05 PM
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8",As a gerenal rule, if you can take all of the third member bolts out with a socket and extension it is an 8". A 9" pinion is offset lower and you have to take the bottom two bolts out with a wrench.
9"


8"


Kelly
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Old 12-19-2013, 06:10 PM
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I agree, it's an 8 inch.
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Old 12-19-2013, 07:46 PM
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I am guessing I should find a 9 inch soon then. The 289 I have built is probably not too much for the car but I am looking to go quite a bit bigger. My future plans are for a big block and to push out over 450hp which is usually where I have seen people say to switch. If I were to go to a junk yard what would be a good vehicle to look for a 9 inch that I could put straight into my car?

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Old 12-19-2013, 09:00 PM
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Clear answer 8inch vs 9inch

Let's start of with the basics of the car. 289 Ford, bored out, good cam, switching to roller rockers and plan on having anywhere from 300-400 hp not sure what else I am going to do to THIS motor. Currently I have a stock 8 inch in the car. Looking all over the internet people have said anywhere from 300hp go to a 9 inch all the way to people saying good built 8 inches are in some 1000hp+ drag cars. I am not really worried about the 289 with the rear end now. BUT, I am currently looking for a 429 block to build. I am planning on not going to crazy of power but definitely above 450 which is another milestone I see for people saying to switch to a 9 inch. I want to know what opinions would be on if I should just have a good build on the 8inch or spend the money finding a 9 and using that. Final plans for the car are a nice hot rod some good sized tires, good horsepower and torque, burnouts, go to the track once in a while, little light to light quickies with friends of course, etc etc.
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Old 12-19-2013, 09:31 PM
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What car? I doubt that you are going to find anything that will bolt in. I would use a truck housing and narrow it to fit your car exactly.
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Old 12-19-2013, 09:32 PM
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Quote:
Originally Posted by big gear head View Post
What car? I doubt that you are going to find anything that will bolt in. I would use a truck housing and narrow it to fit your car exactly.
1963 Ford Fairlane 500
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Old 12-19-2013, 09:35 PM
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Use the 8 inch for now and start building a 9 inch. I would use a truck housing because they are stronger. Have it narrowed to fit your car exactly the way you want it. You are going to need a good differential. Don't try to get by with a junk yard differential for what you have planned. They won't hold up to burnouts. You will need a Detroit Locker or a Truetrac.
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Old 12-20-2013, 04:51 AM
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xh1gh: please do not start mulitple threads on the same subject.

I merged your posts here so the discussion is all located in one thread line
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Old 12-20-2013, 07:15 AM
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The 8" is a fairly strong rear end. A stock one is not going to take over 500HP but really not much in a stock rear is going to handle that much power. As others have said, start with the 8" and if you feel the need, start to gather parts to build a 9".
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Old 12-22-2013, 12:17 AM
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"

It's been 30 years since I've dealt with an 8" rear end but I never had any luck with them. On the street they were ok but if they had a manual tranny and you took them to the drag strip where the track was prepped they would twist off the pinion gear stem even with a mild 289 and BF Goodrich TA radials of the day. With an automatic and street driving you would probably be ok with the 8" but they won't stand any abuse in my opinion which is worth at least what you paid for it.
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