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rear end

 
irishmanspride irishmanspride
New User | Posts: 25 | Joined: 10/12
Posted: 10/21/12
07:22 PM

hello all,
thanks for all the help with the eng build!
   ok here is what's going on, I have a 84 oldsmobile cutlass chevy 350 BUILT turbo 350 tci street f fighter trans tci holeshot converter.tproblem stock rear end I believe a 7.5 10 bolt that I have been told will not hold up. is there anything I can do to make it stronger or is there another rear end that I can get that drops in with out mod? also don't want to break the bank lol budget is almost gone.  

jpatt87 jpatt87
Enthusiast | Posts: 567 | Joined: 02/10
Posted: 10/21/12
09:38 PM

get you a 8.5 10 bolt, they are plenty strong. As with any rear once you start making more power you will need to upgrade it as well, myne is stock behind my 383 running high 11s in 1/4 and i am just now going to upgrade with c clip elim and a spool, but it is doing fine with the stock parts  

irishmanspride irishmanspride
New User | Posts: 25 | Joined: 10/12
Posted: 10/22/12
09:15 AM

I have been looking for one from a 442 grand national or t type buick but know luck so far, any other vehicle that would be in?  I was told el camino but I think those are 7.5 to.  any ideas?  

Dave632 Dave632
Addict | Posts: 2220 | Joined: 07/08
Posted: 10/22/12
01:35 PM

A cast rear end cover which helps support the bearings will help.
Those 7.5 rears will not handle hard launch's with sticky tires.
If you have no traction they will hold all the HP you could put to it.
As soon as the bite gets good then you will be looking for a bigger rear.
I think the 7.5 will hold up until you start to see 60' times under 2.0.
I think the 77-94 1/2 ton Chevy/GM pickups had 8.5s along with the 71-81 Trans Ams some of which had Posi. Width could be a problem there.
I was taking teeth off Ford 9" ring gears with the Beretta but that had 60' times in the 1.0 range. The MW aluminum bolt thru carrier held up well with that stress.
The 9.75 Dana 60 ring gear in the 68 Camaro never gave any trouble but there was a lot of rotating weight there.  
[[SUPPORT AMERICAN CARS, STOMP A RICE CAR TODAY.]]

pepsi1 pepsi1
Guru | Posts: 1718 | Joined: 09/11
Posted: 10/22/12
02:52 PM

I'm a 9" Ford guy when it comes to real Power. I had a Dana60 with a spool in my 1968 Camao I had 5:13 gears in it. I punished it for many years, and I never broke it. Had to replace the gears, but it was do to gear Ratio Change.

Bob  

irishmanspride irishmanspride
New User | Posts: 25 | Joined: 10/12
Posted: 10/22/12
05:10 PM

My budget is a grand, I have looked at the 9 inch and just the housing starts at 750, I think I will try and build the 7.5 unless I can find a 8.5 . any thoughts on gear ratio?  om thinking 373 but not sure  

68scott385 68scott385
Guru | Posts: 1990 | Joined: 10/09
Posted: 10/22/12
06:26 PM

IMO, keep stockpiling money until you find a rear that will fit. Posi unit, gears, and axles will eat your grand and ask for more.  
68scott385 68scott385 68scott385

irishmanspride irishmanspride
New User | Posts: 25 | Joined: 10/12
Posted: 10/22/12
06:35 PM

that is true, winter is comming and it will be in my shop until paint and body is done.  

Dave632 Dave632
Addict | Posts: 2220 | Joined: 07/08
Posted: 10/22/12
07:13 PM

I agree, do it right and you will not have to worry about the rear coming apart at the track. Why throw water in an empty well. There are used Ford 9" assemblies out there that could bolt right into your car. In my opinion they are they best choice out there. With the drop out pumpkin they are the easiest to work on and many parts are available for them.
As far as ratio, if you are running strip only go for a 4.11-4.56.
If you are street/strip 3.23-3.73. If you are doing any amount of highway driving at all go with the 3.23.  
[[SUPPORT AMERICAN CARS, STOMP A RICE CAR TODAY.]]

76Skylark 76Skylark
Guru | Posts: 853 | Joined: 12/11
Posted: 10/23/12
05:27 AM

If you can Spend a grand then you need to Go Straight to a Ford 9".If you use a 3.73 gear that will be a good Street/strip Gear but at 60 mph you will be at 3200 or more(tire size etc.) you already bought a 350turbo so it is too late to say get a 200r4. Enjoy!  

irishmanspride irishmanspride
New User | Posts: 25 | Joined: 10/12
Posted: 10/24/12
09:12 PM

ok 9 inch is the way to go, a friend said look for a 70s ford granada
they have a 9 inch rear and better metal to wield on brackets. if any one knows of a 9 inch
that would bolt into the cutlass four link rear please share, im not to familiar with fords.
thanks for the help, and im thinking around a 343 gear.with a ford rear end will the studs still
line up to chevys 4 3/4 pattern?  I have american torque thrust wheels and would like to
keep them on the car  

pepsi1 pepsi1
Guru | Posts: 1718 | Joined: 09/11
Posted: 10/25/12
03:37 AM

I agree Dave"
  The Ford 9" is not only strong, but it has so many different, Gear Ratios to suit different type tracks. You can pick up third members and install the Different Gear Ratios. It takes maybe an hour to do a gear change with a 9"Ford.

Bob  

pepsi1 pepsi1
Guru | Posts: 1718 | Joined: 09/11
Posted: 10/25/12
04:33 AM

I just want to add the Ford 9" rear I ran was a small bearing rear. I always was a maintainence freak. So pulling the axles to check the bearings was routine for me. I was only going a 1/4 mile at a time. The 9" was braced, and supported as much as possible.I could only stuff a 33 Spline Axle and Spool in it.

Bob  

pepsi1 pepsi1
Guru | Posts: 1718 | Joined: 09/11
Posted: 10/25/12
04:38 AM

Icon Quoteirishmanspride:
that is true, winter is comming and it will be in my shop until paint and body is done.

Irishmanspride:

  Yeah winter is coming and so is Christmas! Tell your family what you want. Gift certificates....It's the little things that eat your budget up believe me. I've been at it a long time. Grin  Cool

Bob  

76Skylark 76Skylark
Guru | Posts: 853 | Joined: 12/11
Posted: 10/26/12
08:45 AM

Look Guys I have an 8.5 under My wagon it has ALL the tricks I am just using it to keep the car rolling,so I would let it go but its only about 40" wide so you cant use the Strange Axles but the Spool is good and I could cut the ends off to put on your rear you would need bearings(large) and the gear has a small nick in it so I wouldn't sell it but I can use it,know what I'm saying.  

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