rearend help?
2nd Gear Member
Joined: Jun 2006
Posts: 181
From: West Virginia
RE: rearend help?
You may find one for less, but there will be no way to tell how worn the gears and bearings are. Also, the seals, brakes, and brake hardware will likely need replaced if it has been sitting for any length of time. What kind of horespower are you putting out. The 8" rearend should hold up to a stock cleveland just fine.
Thread Starter
5th Gear Member
Joined: Dec 2005
Posts: 3,806
From: DFW
RE: rearend help?
ORIGINAL: 428coupe
You may find one for less, but there will be no way to tell how worn the gears and bearings are. Also, the seals, brakes, and brake hardware will likely need replaced if it has been sitting for any length of time. What kind of horespower are you putting out. The 8" rearend should hold up to a stock cleveland just fine.
You may find one for less, but there will be no way to tell how worn the gears and bearings are. Also, the seals, brakes, and brake hardware will likely need replaced if it has been sitting for any length of time. What kind of horespower are you putting out. The 8" rearend should hold up to a stock cleveland just fine.
3rd Gear Member
Joined: Apr 2004
Posts: 686
From:
RE: rearend help?
Any nine inch rear from a 67-70 Mustang or Cougar will bolt directly into your 69. You will have to shorten your drive shaft. Factory rears came with 28 spline axles and the axles from your 8" rear will fit. That said, why don't you just replace the center section in your eight inch rear. For the cost of a drum to drum nine inch, you can get set up with a posi eight inch center section. Provided you're not racing or using super sticky tires, the eight should hold up.
2nd Gear Member
Joined: May 2006
Posts: 169
From:
RE: rearend help?
There just isnt that much strength difference between the 8 and 9 inch rears, I'm running an 8" detroit locker in a nine inch housing with a modified 351w. This combo works quite weee, I have a couple of 9" centers in my storage building, just siting there, and thery will stay as long as the 8" stays in. It can taks almost as much abuse and no need to change something that works well. To me it isnt worth getting doferent axles and shortning the pushpole. I can put seals and gaskets in a rear in an afternoon and spend that money on something else. I have a friend that runs an 8" locker behind a highly modified 429, and has for years, and he just loves to fry a set of tires.
5th Gear Member
Joined: Dec 2005
Posts: 2,634
From: SC
RE: rearend help?
I agree.. I just rebuilt my 8 inch and along with a set of 3:55's I installed a Richmond locker. According to the spec's it should have no problem handling 400hp. No clutches to worry about at all.
Here is the one I have, can't beat it for $200 (thats what I paid).... http://www.powertrax.com/lockright.html
Here is the one I have, can't beat it for $200 (thats what I paid).... http://www.powertrax.com/lockright.html
ORIGINAL: paladin_1888
There just isnt that much strength difference between the 8 and 9 inch rears, I'm running an 8" detroit locker in a nine inch housing with a modified 351w. This combo works quite weee, I have a couple of 9" centers in my storage building, just siting there, and thery will stay as long as the 8" stays in. It can taks almost as much abuse and no need to change something that works well. To me it isnt worth getting doferent axles and shortning the pushpole. I can put seals and gaskets in a rear in an afternoon and spend that money on something else. I have a friend that runs an 8" locker behind a highly modified 429, and has for years, and he just loves to fry a set of tires.
There just isnt that much strength difference between the 8 and 9 inch rears, I'm running an 8" detroit locker in a nine inch housing with a modified 351w. This combo works quite weee, I have a couple of 9" centers in my storage building, just siting there, and thery will stay as long as the 8" stays in. It can taks almost as much abuse and no need to change something that works well. To me it isnt worth getting doferent axles and shortning the pushpole. I can put seals and gaskets in a rear in an afternoon and spend that money on something else. I have a friend that runs an 8" locker behind a highly modified 429, and has for years, and he just loves to fry a set of tires.
I ♥ Acer
Joined: Oct 2004
Posts: 17,565
From:
RE: rearend help?
Yeah, but there is just too much information and facts about the 9 inch being a stronger rear for high powered Mustangs, big block torinos, etc. and trucks. Ford engineers weren't stupid when they designated which rear to put into which cars back then.
5th Gear Member
Joined: Dec 2005
Posts: 2,634
From: SC
RE: rearend help?
Yeah but, we have advanced a great deal in them years past.. If you have an 8 inch already, its cheaper to rebuild it then go and get a 9 inch. Just have to do the upgrades in the pumpkin and axles and you're set for a long time..
ORIGINAL: Soaring
Yeah, but there is just too much information and facts about the 9 inch being a stronger rear for high powered Mustangs, big block torinos, etc. and trucks. Ford engineers weren't stupid when they designated which rear to put into which cars back then.
Yeah, but there is just too much information and facts about the 9 inch being a stronger rear for high powered Mustangs, big block torinos, etc. and trucks. Ford engineers weren't stupid when they designated which rear to put into which cars back then.
3rd Gear Member
Joined: Apr 2004
Posts: 686
From:
RE: rearend help?
I agree with Soaring and I've broken enough eight inch rears over the years to say that there is huge difference between eight and nine inch rears. Even a warmed over 289 or 302 will break an eight with slicks, bars and a standard transmission. The street is a different story, an eight will usually hold up pretty well even with a big motor due to the limited traction available.
5th Gear Member
Joined: Dec 2005
Posts: 2,634
From: SC
RE: rearend help?
Well thats what I'm talking about. Most guys on this forum are not going to see track time therefor a 9 inch is a waste of money. An 8 inch done up the right way will handle up to 400 HP with no problem at all. If you're going to pound the **** out of it on the track, time to go to a 9 inch.
ORIGINAL: 69FECoupe
I agree with Soaring and I've broken enough eight inch rears over the years to say that there is huge difference between eight and nine inch rears. Even a warmed over 289 or 302 will break an eight with slicks, bars and a standard transmission. The street is a different story, an eight will usually hold up pretty well even with a big motor due to the limited traction available.
I agree with Soaring and I've broken enough eight inch rears over the years to say that there is huge difference between eight and nine inch rears. Even a warmed over 289 or 302 will break an eight with slicks, bars and a standard transmission. The street is a different story, an eight will usually hold up pretty well even with a big motor due to the limited traction available.