Previous Thread
Next Thread
Print Thread
Building a Pro Touring 69 Dart - Which diffferential? #2339922
07/19/17 07:14 PM
07/19/17 07:14 PM
Joined: Jul 2005
Posts: 2,634
Right Coast
Fabman Offline OP
master
Fabman  Offline OP
master

Joined: Jul 2005
Posts: 2,634
Right Coast
I'm building a Pro Touring 69 Dart. The car is mini tubed for wider rear tires. Looking to set up the rear end. My question is....if costs are the same - which differential setup should I install? 8 3/4 or Dana 60?

8 3/4 or Dana 60
single choice
Votes accepted starting: 07/19/17 07:13 PM
You must vote before you can view the results of this poll.
Re: Building a Pro Touring 69 Dart - Which diffferential? [Re: Fabman] #2340146
07/20/17 02:57 AM
07/20/17 02:57 AM
Joined: Aug 2004
Posts: 3,310
Walnut Creek, CA
blown340 Offline
master
blown340  Offline
master

Joined: Aug 2004
Posts: 3,310
Walnut Creek, CA
you really need to let us know horsepower, weight, and if you are going to be running slicks or street tires to get a good answer. The dana is stout but heavy. The 8_3/4 can handle alot of power as well and is a decent amount less unsprung weight.

-Jon


70 challenger convertible. 340/5 speed. blown, intercooled, efi, blah blah blah 71 valiant scamp 318/A833OD/AC/PS 00 dakota RC 4.7L 5 spd autoX'r. SRT10/T56 swap in process 73 W200 Power wagon, PTO winch, 4 spd
Re: Building a Pro Touring 69 Dart - Which diffferential? [Re: Fabman] #2340148
07/20/17 03:11 AM
07/20/17 03:11 AM
Joined: Jan 2003
Posts: 30,947
Oregon
A
AndyF Offline
I Win
AndyF  Offline
I Win
A

Joined: Jan 2003
Posts: 30,947
Oregon
For Pro Touring you probably want a Ford 9 inch. You most likely don't need a ton of strength but you'll want some higher gears rather than lower (Dana 60 is a truck rearend and highest gear is a 3.54). Also, you will most likely want some serious bling brakes on there. 13 or 14 inch rotors and that kind of stuff is off the shelf for a Ford 9 inch. Not a lot of brake choices for Mopar stuff. The Dana is too big for most Pro Touring cars. The big center section gets in the way of the exhaust, suspension, etc. If you are running big tires tucked under the car then there isn't much space left for shocks, springs and exhaust. Besides, you don't want all of that unsprung weight in a real Pro Touring car. If the car is being built to get up and go you don't want that big Dana center section bouncing the rear end around.

Re: Building a Pro Touring 69 Dart - Which diffferential? [Re: Fabman] #2340178
07/20/17 09:05 AM
07/20/17 09:05 AM
Joined: Jul 2005
Posts: 2,634
Right Coast
Fabman Offline OP
master
Fabman  Offline OP
master

Joined: Jul 2005
Posts: 2,634
Right Coast
Great information Gents. Anyone know what the weights are for these two axle asseblies? This will be street driven mostly. 450 hp 4 spd car.

Last edited by Fabman; 07/20/17 09:08 AM.
Re: Building a Pro Touring 69 Dart - Which diffferential? [Re: Fabman] #2341665
07/22/17 09:35 PM
07/22/17 09:35 PM
Joined: Jan 2003
Posts: 30,947
Oregon
A
AndyF Offline
I Win
AndyF  Offline
I Win
A

Joined: Jan 2003
Posts: 30,947
Oregon
No reason to even consider a Dana 60 at 450 hp. Build up a 8 3/4 or get the 9 inch.

Give Cass a call and see what he says. (DoctorDiff)

Re: Building a Pro Touring 69 Dart - Which diffferential? [Re: Fabman] #2341988
07/23/17 03:13 PM
07/23/17 03:13 PM
Joined: Feb 2011
Posts: 4,302
Nebraska
72Swinger Offline
master
72Swinger  Offline
master

Joined: Feb 2011
Posts: 4,302
Nebraska
8 3/4 has served me fine for 20 years. Until slicks, manual trans and a healthy 6.1 Hemi stroker entered the picture. Twisted axle splines and broken side gears in the Spicer made me go to a Dana.
http://i626.photobucket.com/albums/tt347/bdhmbre/20170712_181427_zpsgwksfiwq.jpg

Last edited by 72Swinger; 07/23/17 03:21 PM.

Mopar to the bone!!!
Re: Building a Pro Touring 69 Dart - Which diffferential? [Re: Fabman] #2342069
07/23/17 06:53 PM
07/23/17 06:53 PM
Joined: Nov 2006
Posts: 6,005
Reno, Nevada
NV69B7RR Offline
master
NV69B7RR  Offline
master

Joined: Nov 2006
Posts: 6,005
Reno, Nevada
Another option would be an 8.8 Ford rear out of an Explorer. Width is almost the same and comes with disc brakes and can be made pretty stout. Initial buy in is a fraction of an 8 3/4. Lots of info over on FABO.

Re: Building a Pro Touring 69 Dart - Which diffferential? [Re: Fabman] #2344730
07/28/17 09:56 AM
07/28/17 09:56 AM
Joined: May 2005
Posts: 723
Houston Tx
Uhcoog1 Offline
super stock
Uhcoog1  Offline
super stock

Joined: May 2005
Posts: 723
Houston Tx
9" floater. Depending on the brakes you intend to run.


-'02 Dodge Viper Ex-World Challenge racecar
-'73 Duster, 6.1 based 392 hilborn hemi, tko600, full floater rear 9", Hellwig custom bars, viper brakes, built for road course
Re: Building a Pro Touring 69 Dart - Which diffferential? [Re: Uhcoog1] #2344792
07/28/17 12:37 PM
07/28/17 12:37 PM
Joined: Dec 2003
Posts: 22,695
Bitopia
J
jcc Offline
If you can't dazzle em with diamonds..
jcc  Offline
If you can't dazzle em with diamonds..
J

Joined: Dec 2003
Posts: 22,695
Bitopia
He's probably grin right, ask him what he runs.


Reality check, that half the population is smarter then 50% of the people and it's a constantly contested fact.
Re: Building a Pro Touring 69 Dart - Which diffferential? [Re: Fabman] #2348899
08/05/17 12:18 PM
08/05/17 12:18 PM
Joined: Nov 2008
Posts: 1,490
Lethbridge, AB, Canada
dangina Offline
pro stock
dangina  Offline
pro stock

Joined: Nov 2008
Posts: 1,490
Lethbridge, AB, Canada
dana is 100 lbs heavier if i remember, food for thought..

Re: Building a Pro Touring 69 Dart - Which diffferential? [Re: Fabman] #2348945
08/05/17 01:44 PM
08/05/17 01:44 PM
Joined: Jan 2003
Posts: 8,016
Polson, MT
DoctorDiff Offline
master
DoctorDiff  Offline
master

Joined: Jan 2003
Posts: 8,016
Polson, MT
A new 35 spline S-60 with sure-grip is less than 50 lbs heavier than a stock 30 spline 8.75" rear.

Re: Building a Pro Touring 69 Dart - Which diffferential? [Re: Fabman] #2348964
08/05/17 02:15 PM
08/05/17 02:15 PM
Joined: Sep 2007
Posts: 14,889
up yours
Supercuda Offline
About to go away
Supercuda  Offline
About to go away

Joined: Sep 2007
Posts: 14,889
up yours
And it's all unsprung, this is a handling forum after all.


They say there are no such thing as a stupid question.
They say there is always the exception that proves the rule.
Don't be the exception.
Re: Building a Pro Touring 69 Dart - Which diffferential? [Re: Supercuda] #2349266
08/06/17 01:08 AM
08/06/17 01:08 AM
Joined: Jan 2007
Posts: 7,664
IN
A
ahy Offline
master
ahy  Offline
master
A

Joined: Jan 2007
Posts: 7,664
IN
The 8.75 should be fine with street or typical road track tires.

If you are running drag tires and launching hard, you may need the D60 for reliability.

Re: Building a Pro Touring 69 Dart - Which diffferential? [Re: Fabman] #2350578
08/08/17 10:36 AM
08/08/17 10:36 AM
Joined: Nov 2013
Posts: 111
Connecticut, USA
MRGTX Offline
member
MRGTX  Offline
member

Joined: Nov 2013
Posts: 111
Connecticut, USA
Great info in this thread.

So repressing the gag reflex and considering a "Ferd" rear axle (just kidding, I also own a Mustang and love it! laugh ) where would you look to source a complete 9"?

How do they compare for weight/cost, etc?

Re: Building a Pro Touring 69 Dart - Which diffferential? [Re: Fabman] #2350613
08/08/17 11:46 AM
08/08/17 11:46 AM
Joined: Jan 2003
Posts: 5,385
Pikes Peak Country
T
TC@HP2 Offline
master
TC@HP2  Offline
master
T

Joined: Jan 2003
Posts: 5,385
Pikes Peak Country
Since there are fabricated 8.75 housings out there, the only reason I could see to go with a 9" would be the simple proliferation of gear sets that can be picked up at reasonable prices from swap meets.







Powered by UBB.threads™ PHP Forum Software 7.7.1