Slant Six Forum :: rear end Question

What rear end do you have? 7 1/4 or 8 1/4 rear axle? Gear ratio? Limited slip?

A 1975 Duster could have come stock with a 7 1/4 or 8 1/4 rear axle. If you don't know how to tell what rear axle you have and aren't mechanically inclined, you really shouldn't be building a performance motor. My advice to you is to purchase a factory service manual for your vehicle and read it until you understand what it is you are working on. Get what you have running well in stock condition before you try and modify it.

I don't care if you are the boss. If you don't know what kind of rear axle you have, you shouldn't be telling your "skilled mech" what to do. Do your homework before you go telling other people what they should do for you.

Better yet, use the search button on this site because your questions have been answered and discussed many many many many many many times before.

GEE THANKS. DO ME A FAVOR DON'T REPLY TO ANY MORE OF MY POSTS.

I stand by my answer that if he is so unfamiliar with his vehicle that he can't identify the rear end it is equipped with then he really shouldn't be building a performance motor or telling someone else what he wants put in his motor.

How does he know what he is building will work? How does he know what he is paying for won't break some other part of his car? How will he know how to fix it if it does break?

I always tell people to get their car running right in stock form before they start changing things. If that person also does not know how to work on their car themselves, I also tell them they should do their homework and learn how their vehicle works before they start throwing money and effort at it.

I missed his previous post where he stated the car had drum brakes all around.

I will say this before I built a hot motor I would upgrade the brakes to front disc brakes, which usually involves upgrading the rear axle to an 8 1/4. I also wouldn't start building a motor without knowing the rear gear ratio of the rear axle. This is often stamped on a tag affixed to the cover on the rear axle.

My posts may have sounded harsh, but it really is the best advice for him. He needs to learn what he is talking about and doing before he goes modifying his car.

Author:	JokerRides [ Thu May 02, 2013 8:59 am ]
Post subject:	rear end Question
I have a stock 1975 - 225 motor duster . i will be doing .30 over,erson 270 cam 9.5 to 1 compression,headers,and 4bbl holly will stock rear end hold up? any comments and or suggestions would greatly be accepted.

Author:	Reed [ Thu May 02, 2013 9:09 am ]
Post subject:
What rear end do you have? 7 1/4 or 8 1/4 rear axle? Gear ratio? Limited slip?

Author:	JokerRides [ Thu May 02, 2013 9:39 am ]
Post subject:
Quote: What rear end do you have? 7 1/4 or 8 1/4 rear axle? Gear ratio? Limited slip? don't really know how to tell. I am not mechanically inclined. I do know its stock.

Author:	Reed [ Thu May 02, 2013 10:47 am ]
Post subject:
A 1975 Duster could have come stock with a 7 1/4 or 8 1/4 rear axle. If you don't know how to tell what rear axle you have and aren't mechanically inclined, you really shouldn't be building a performance motor. My advice to you is to purchase a factory service manual for your vehicle and read it until you understand what it is you are working on. Get what you have running well in stock condition before you try and modify it.

Author:	JokerRides [ Thu May 02, 2013 11:15 am ]
Post subject:
Quote: A 1975 Duster could have come stock with a 7 1/4 or 8 1/4 rear axle. If you don't know how to tell what rear axle you have and aren't mechanically inclined, you really shouldn't be building a performance motor. My advice to you is to purchase a factory service manual for your vehicle and read it until you understand what it is you are working on. Get what you have running well in stock condition before you try and modify it. 1. I don't "do the work" I'm the boss.I will aquire skilled mech for the actual work. 2. Car is in stock "running condition"3. I ask several "experts" online about what I propose to do before approaching "skilled mech",so i do it right the first time and know about how it is supposed to be. Instead of getting "ripped off". I will get the manual. Thanks again. now ,that i explained myself. will you answer my questions? 7 1/4 or 8 1/4 rear axle? how do i tell? Gear ratio? how do i tell? Limited slip? whats that? like the tranny slipping?

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rear end Question https://slantsix.org/forum/viewtopic.php?t=51929	Page 1 of 2

Author:	Reed [ Thu May 02, 2013 11:33 am ]
Post subject:
I don't care if you are the boss. If you don't know what kind of rear axle you have, you shouldn't be telling your "skilled mech" what to do. Do your homework before you go telling other people what they should do for you. Better yet, use the search button on this site because your questions have been answered and discussed many many many many many many times before.

Author:	JokerRides [ Thu May 02, 2013 11:54 am ]
Post subject:
Quote: I don't care if you are the boss. If you don't know what kind of rear axle you have, you shouldn't be telling your "skilled mech" what to do. Do your homework before you go telling other people what they should do for you. Better yet, use the search button on this site because your questions have been answered and discussed many many many many many many times before. GEE THANKS. DO ME A FAVOR DON'T REPLY TO ANY MORE OF MY POSTS.

Author:	DusterIdiot [ Thu May 02, 2013 12:29 pm ]
Post subject:	Sbp...
His previous posts said he had drums all around=SBP...if so for that late of a car it will be a 7 1/4"... If he goes with and erson and 10:1 compression to make the best use of the cam and an appropriate intake he will blow the diff and be crying for something bigger...if he keeps the bolt pattern, he will need an 8 3/4" rear... ...and Joker, to confirm the rear diff...get your butt under the rear bumper like the rest of us and count how many bolts are in the rear cover of the diff... you won't ever get to know what the car is all about and how to work on it without getting in/under/around it and taking notes and pics so you can determine the best approach. (Being a boss myself I follow a golden rule with my subordinates- Don't ask them to do something you can't do yourself. You get way more respect for that attitude). Also we have posted a lot of information about upgrades, research your car, look at the build matrix and axle/brake/suspension upgrades...then make a plan (the mechanic being the guy knowing more about what you are asking may need lots of $$$ to do what you propose as parts may not be easy to get for the upgrade...) -D.Idiot

Author:	sandy in BC [ Thu May 02, 2013 2:23 pm ]
Post subject:
Quote: GEE THANKS. DO ME A FAVOR DON'T REPLY TO ANY MORE OF MY POSTS. No Problem! USERNAME: JokerRides is <IGNORED>

Author:	valiant1966 [ Thu May 02, 2013 3:17 pm ]
Post subject:
That's nice. Someone comes on here asking questions and we are supposed to be here to help and share ideas and we tell them that maybe they shouldn't even be working on cars! I enjoy a good steak but don't know crap about how to butcher a cow. Maybe I shouldn't be eating steak. I don't know how to fly and airplane so maybe I should stay out of them.

Author:	Reed [ Thu May 02, 2013 3:38 pm ]
Post subject:
I stand by my answer that if he is so unfamiliar with his vehicle that he can't identify the rear end it is equipped with then he really shouldn't be building a performance motor or telling someone else what he wants put in his motor. How does he know what he is building will work? How does he know what he is paying for won't break some other part of his car? How will he know how to fix it if it does break? I always tell people to get their car running right in stock form before they start changing things. If that person also does not know how to work on their car themselves, I also tell them they should do their homework and learn how their vehicle works before they start throwing money and effort at it. I missed his previous post where he stated the car had drum brakes all around. I will say this before I built a hot motor I would upgrade the brakes to front disc brakes, which usually involves upgrading the rear axle to an 8 1/4. I also wouldn't start building a motor without knowing the rear gear ratio of the rear axle. This is often stamped on a tag affixed to the cover on the rear axle. My posts may have sounded harsh, but it really is the best advice for him. He needs to learn what he is talking about and doing before he goes modifying his car.

Author:	valiant1966 [ Thu May 02, 2013 3:42 pm ]
Post subject:
Maybe this will help. I don't mind helping someone searching for knowledge if I can. http://www.crankshaftcoalition.com/wiki ... %27s_guide

Author:	kesteb [ Thu May 02, 2013 10:51 pm ]
Post subject:
Quote: I stand by my answer that if he is so unfamiliar with his vehicle that he can't identify the rear end it is equipped with then he really shouldn't be building a performance motor or telling someone else what he wants put in his motor. How does he know what he is building will work? How does he know what he is paying for won't break some other part of his car? How will he know how to fix it if it does break? I always tell people to get their car running right in stock form before they start changing things. If that person also does not know how to work on their car themselves, I also tell them they should do their homework and learn how their vehicle works before they start throwing money and effort at it. I missed his previous post where he stated the car had drum brakes all around. I will say this before I built a hot motor I would upgrade the brakes to front disc brakes, which usually involves upgrading the rear axle to an 8 1/4. I also wouldn't start building a motor without knowing the rear gear ratio of the rear axle. This is often stamped on a tag affixed to the cover on the rear axle. My posts may have sounded harsh, but it really is the best advice for him. He needs to learn what he is talking about and doing before he goes modifying his car. While this is commendable, the OP will not be the first to build a car with his checkbook instead of his hands.

Author:	Dart270 [ Fri May 03, 2013 6:01 am ]
Post subject:
Easy folks. No reason to discourage someone from getting into building a car, however he or she wants to do it. Also, taking offense at someone's "opinion" post usually leads to no progress (cars, learning, etc...). I try to have a very thick skin when it comes to internet advice and traffic, and that serves me well to learn what I need to learn and accomplish things. Thanks, Lou

Author:	75valiant [ Fri May 03, 2013 8:13 am ]
Post subject:
reminds me of "kung fu" or "the karate kid". i certainly welcome jokerrides as a newbie, as i am a newbie myself. on the other hand, i've learned a lot since being a teenager about dealing with oldtimers with lots of experience. reed DID give good advice, but it wasn't exactly diplomatic. on the other hand, the joker needs to understand one of two things: if you are young and inexperienced, be humble when dealing with the experts. if, on the other hand, you plan to buy your way to success because you've got the money to do so, don't expect free and cheerful advice from someone who may very well feel that you are ignoring that advice.

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