Dana 44, 12 Bolt or 9"???
Dana 44, 12 Bolt or 9"???
I am going to be building up a 82 Camaro for some heavy street going and a lot of drag racing. I know SLP is selling the Dana for a good price. What I want to know is for those who have any of the rears, what are the advantages and disadvantages of them.
The engine is a 350 and I am probably going to install the Holley Sytemax Heads, cam and intake along with a Demon carb. The tranny is a 700R4 for now. Eventually though, the car will get a T350 and either a Big Block Chevy or, to be a bit different, a 455 Edelbrock headed Pontiac engine. The rear is going to have to survive some ET Street or slick launches.
So, any and all opinion will be greatly appreciated.
Thanks
The engine is a 350 and I am probably going to install the Holley Sytemax Heads, cam and intake along with a Demon carb. The tranny is a 700R4 for now. Eventually though, the car will get a T350 and either a Big Block Chevy or, to be a bit different, a 455 Edelbrock headed Pontiac engine. The rear is going to have to survive some ET Street or slick launches.
So, any and all opinion will be greatly appreciated.
Thanks
Dana 44 for sure,i dont know many rears that beat it,lets see what people think. 
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www.rearman.com/camarokid.htm
If it aint a V-8 that $hit aint fast!,unless its a GN,lol!
305 tpi,700r-4 with shift kit,16 by 9 American Racing cross laced wheels,My mods are minimal,just a bunch of little $hit.Anyone know where to get underdrive pulleys for a v-belt set up?

------------------
www.rearman.com/camarokid.htm
If it aint a V-8 that $hit aint fast!,unless its a GN,lol!
305 tpi,700r-4 with shift kit,16 by 9 American Racing cross laced wheels,My mods are minimal,just a bunch of little $hit.Anyone know where to get underdrive pulleys for a v-belt set up?
Supreme Member

Joined: Jan 2001
Posts: 1,978
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From: PA
Car: 88 Firebird WS6
Engine: 350 TPI
Transmission: T56
Axle/Gears: 3.42
The ford 9" has the advantage of easy center section swaps. So you could drive your car to the track and swap it out to 4.56's or whatever for quicker 1/4's.
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Joined: Jul 1999
Posts: 17,274
Likes: 171
From: 51°N 114°W, 3500'
Car: 87 IROC L98
Engine: 588 Alcohol BBC
Transmission: Powerglide
Axle/Gears: Ford 9"/31 spline spool/4.86
Dana44 is 8.5" ring gear, Ford is 9" and 12 bolt is 8.875".
The 12 bolt uses different series carriers as the gear ratios decrease. The 9" all fit on the same carrier. You can find a ford posi with 2.50 gears on it and install 4.56 with no problems. There are more gear choices with a 9". It takes a little less HP to turn a 12 bolt.
There are many pro's and con's to each but it all depends on what you want to use it for.
I still run a 7 5/8" 10 bolt in my car. When it finally goes, a 9" will take it's place.
The Dana44 isn't a bad diff. There just isn't as much aftermarket available for it as there is for a 12 bolt or 9".
------------------
Follow my racing progress on Stephen's racing page
and check out the race car
87 IROC-Z SuperPro ET Bracket Race Car
461 naturally aspirated Big Block
Best ET on a time slip: 11.242 altitude corrected to 10.69
Best MPH on a time slip: 121.52 altitude corrected to 127.76
Altitude corrected rear wheel HP based on power to weight ratio: 504.5
Best 60 foot: 1.546
Racing at 3500 feet elevation but most race days it's over 5000 feet density altitude!
Member of the Calgary Drag Racing Association
87 IROC bracket car, 91 454SS daily driver, 95 Homebuilt Harley
The 12 bolt uses different series carriers as the gear ratios decrease. The 9" all fit on the same carrier. You can find a ford posi with 2.50 gears on it and install 4.56 with no problems. There are more gear choices with a 9". It takes a little less HP to turn a 12 bolt.
There are many pro's and con's to each but it all depends on what you want to use it for.
I still run a 7 5/8" 10 bolt in my car. When it finally goes, a 9" will take it's place.
The Dana44 isn't a bad diff. There just isn't as much aftermarket available for it as there is for a 12 bolt or 9".
------------------
Follow my racing progress on Stephen's racing page
and check out the race car
87 IROC-Z SuperPro ET Bracket Race Car
461 naturally aspirated Big Block
Best ET on a time slip: 11.242 altitude corrected to 10.69
Best MPH on a time slip: 121.52 altitude corrected to 127.76
Altitude corrected rear wheel HP based on power to weight ratio: 504.5
Best 60 foot: 1.546
Racing at 3500 feet elevation but most race days it's over 5000 feet density altitude!
Member of the Calgary Drag Racing Association
87 IROC bracket car, 91 454SS daily driver, 95 Homebuilt Harley
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