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weight difference 8 3/4, 9 in and d60 #1770125
03/03/15 02:35 PM
03/03/15 02:35 PM
Joined: Jan 2007
Posts: 774
Midland,Tx
wyldebill Offline OP
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has any body ever sat down and compaired the weights side by side? ive seen all the bickering about what is stonger. i just wondering about a weight dif.

Re: weight difference 8 3/4, 9 in and d60 [Re: wyldebill] #1770126
03/03/15 02:48 PM
03/03/15 02:48 PM
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Florida
Locomotion Offline
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FYI, while there are obvious weight differences, the Dana 60 is more "efficient" than an 8 3/4 rear. I've been told by several class racers that in most cases, there has been minimal, if any, change in ET. The Ford 9" is probably the least efficient of the popular rears and the Chevy 12 bolt is the best!

It's been discussed and, for some reason, 30 - 40 lbs sticks in my mind. But it will have to be an apples-to-apples comparison with the same width, spool or sure-grip, etc.

Last edited by Locomotion; 03/03/15 02:51 PM.
Re: weight difference 8 3/4, 9 in and d60 [Re: Locomotion] #1770127
03/03/15 02:50 PM
03/03/15 02:50 PM
Joined: Mar 2007
Posts: 1,608
Rudolph, Ohio
moparguy7074 Offline
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Quote:

FYI, while there are obvious weight differences, the Dana 60 is more "efficient" than an 8 3/4 rear. I've been told by several class racers that in most cases, there has been minimal, if any, change in ET. The Ford 9" is probably the least efficient of the popular rears and the Chevy 12 bolt is the best!




Are you trying to start WW III? Saying a 9" is the least efficient! Oh the humanity! LOL

Re: weight difference 8 3/4, 9 in and d60 [Re: moparguy7074] #1770128
03/03/15 02:58 PM
03/03/15 02:58 PM
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dogdays Offline
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It's a simple fact, the farther the pinion centerline is away from the ring gear centerline, as a percentage, the lower the mechanical efficiency. That's because there is more sliding of surfaces.

These are called hypoid gears. The inventor of the hypoid gear actually worked out the mathematics of the surfaces before building the first one. That flat boggles my mind. Before his invention, those right angle gear drives had the pinion centerline and ring gear centerline intersecting.

The hypoid gearset allowed car manufacturers to lower the driveshaft, thus lower the floor of the car.

Hypoid gearsets mandated the development of Extreme Pressure (EP or GL-5) gear lubes to deal with the sliding surfaces.

R.

Re: weight difference 8 3/4, 9 in and d60 [Re: dogdays] #1770129
03/03/15 03:04 PM
03/03/15 03:04 PM
Joined: Jan 2007
Posts: 1,167
MI
6
68shifter Offline
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A complete dana 60 with posi, 11" drums, 35 spline axles and a body width that I shipped weighed 212lbs. This was complete with brake lines etc.

No idea on the other two.

Re: weight difference 8 3/4, 9 in and d60 [Re: moparguy7074] #1770130
03/03/15 03:06 PM
03/03/15 03:06 PM
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Florida
Locomotion Offline
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Quote:

Quote:

FYI, while there are obvious weight differences, the Dana 60 is more "efficient" than an 8 3/4 rear. I've been told by several class racers that in most cases, there has been minimal, if any, change in ET. The Ford 9" is probably the least efficient of the popular rears and the Chevy 12 bolt is the best!




Are you trying to start WW III? Saying a 9" is the least efficient! Oh the humanity! LOL




It would be pointless to argue with the facts.

As far as strength, I'm well aware of my old buddy Quicktree's opinion on 9" vs Dana 60's. But despite the ease of gear changes in a 9", a Dana 60 will handle anything most people would ever need. Once the optimum gear ratio is known, the drop-out center benefit isn't that big of a deal. Besides, the expense of maxing out a 9" is astronomical.

Re: weight difference 8 3/4, 9 in and d60 [Re: 68shifter] #1770131
03/03/15 03:08 PM
03/03/15 03:08 PM
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U.S.
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moparniac Offline
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My Dana 60 was lighter than the 83/4 it replaced ...the danA had a spool and disc brakes.


Mopar Performance
Re: weight difference 8 3/4, 9 in and d60 [Re: moparguy7074] #1770132
03/03/15 04:25 PM
03/03/15 04:25 PM
Joined: Feb 2007
Posts: 2,578
sweden
1
1Fast340 Offline
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sweden
Quote:

Quote:

FYI, while there are obvious weight differences, the Dana 60 is more "efficient" than an 8 3/4 rear. I've been told by several class racers that in most cases, there has been minimal, if any, change in ET. The Ford 9" is probably the least efficient of the popular rears and the Chevy 12 bolt is the best!




Are you trying to start WW III? Saying a 9" is the least efficient! Oh the humanity! LOL




Dont we need the pinionangle variable to be perfectly sure?

Re: weight difference 8 3/4, 9 in and d60 [Re: 1Fast340] #1770133
03/03/15 05:08 PM
03/03/15 05:08 PM
Joined: Jan 2007
Posts: 774
Midland,Tx
wyldebill Offline OP
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i didnt start this to argue witch is best. only asking for weights. i dont thing the parasitic drag is enough to worry with.

Re: weight difference 8 3/4, 9 in and d60 [Re: wyldebill] #1770134
03/03/15 05:39 PM
03/03/15 05:39 PM
Joined: Dec 2004
Posts: 113
Va Usa
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beecrazy Offline
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Va Usa
According to this article in Hot rod its 17lbs without brakes.


W/O BRAKES W/BRAKES

12-bolt 171 210
Strange S60 191 230
Currie 9-inch 174 238


http://www.hotrod.com/how-to/transmission-drivetrain/ccrp-0806-chevy-chevelle-rear-axle-swap/

Kevin

Re: weight difference 8 3/4, 9 in and d60 [Re: wyldebill] #1770135
03/03/15 05:49 PM
03/03/15 05:49 PM
Joined: Sep 2010
Posts: 170
renton , washington
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perfmachst Offline
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renton , washington
hi, my dana 60 with 35 spline axles and spool was 32 # more versus 8 3/4 with same parts. did not slow car one bit. actually rolled easier.

Re: weight difference 8 3/4, 9 in and d60 [Re: wyldebill] #1770136
03/03/15 05:52 PM
03/03/15 05:52 PM
Joined: Jan 2003
Posts: 29,974
Oregon
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AndyF Offline
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Oregon
It is going to depend on what parts are used. Spools are very light compared to a locker or limited slip. Big axles are heavier than small axles. Standard gears or lightweight gears? Aluminum center section or iron? No brakes, drum brakes, disc brakes?

Re: weight difference 8 3/4, 9 in and d60 [Re: wyldebill] #1770137
03/03/15 06:25 PM
03/03/15 06:25 PM
Joined: Feb 2007
Posts: 2,578
sweden
1
1Fast340 Offline
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Quote:

i didnt start this to argue witch is best. only asking for weights. i dont thing the parasitic drag is enough to worry with.




Sorry could not resist.

To get back on track i think you could see a substantial difference depending on all the parts inside the axle aswell as other little things here and there all the way down to details like the driveshaft lenght,wish will be different depending on rearend used

Re: weight difference 8 3/4, 9 in and d60 [Re: wyldebill] #1770138
03/03/15 07:10 PM
03/03/15 07:10 PM
Joined: Apr 2013
Posts: 345
Nebraska
4
451Cuda Offline
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Nebraska
Quote:

has any body ever sat down and compaired the weights side by side? ive seen all the bickering about what is stonger. i just wondering about a weight dif.




I wish they'd been a bit more scientific about this comparison, but it gives a good idea of the differences in weight.

http://www.hotrod.com/how-to/transmission-drivetrain/ccrp-0806-chevy-chevelle-rear-axle-swap/

Re: weight difference 8 3/4, 9 in and d60 [Re: Locomotion] #1770139
03/03/15 07:18 PM
03/03/15 07:18 PM
Joined: Jan 2003
Posts: 32,394
Q
Quicktree Offline
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Quote:

Quote:

Quote:

FYI, while there are obvious weight differences, the Dana 60 is more "efficient" than an 8 3/4 rear. I've been told by several class racers that in most cases, there has been minimal, if any, change in ET. The Ford 9" is probably the least efficient of the popular rears and the Chevy 12 bolt is the best!




Are you trying to start WW III? Saying a 9" is the least efficient! Oh the humanity! LOL




It would be pointless to argue with the facts.

As far as strength, I'm well aware of my old buddy Quicktree's opinion on 9" vs Dana 60's. But despite the ease of gear changes in a 9", a Dana 60 will handle anything most people would ever need. Once the optimum gear ratio is known, the drop-out center benefit isn't that big of a deal. Besides, the expense of maxing out a 9" is astronomical.


dana 60's are for trucks 9s are for racing, you can't argue facts

Re: weight difference 8 3/4, 9 in and d60 [Re: moparniac] #1770140
03/03/15 07:20 PM
03/03/15 07:20 PM
Joined: Jan 2003
Posts: 15,439
Val-haul-ass... eventually
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BradH Offline
Taking time off to work on my car
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Quote:

My Dana 60 was lighter than the 83/4 it replaced ...the danA had a spool and disc brakes.



My Strange S-60 is going to lighten my wallet a whole lot more than the 8-3/4 it's going to replace.

Re: weight difference 8 3/4, 9 in and d60 [Re: Quicktree] #1770141
03/03/15 08:40 PM
03/03/15 08:40 PM
Joined: Jan 2003
Posts: 5,829
Florida
Locomotion Offline
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Florida
Quote:

Quote:

Quote:

Quote:

FYI, while there are obvious weight differences, the Dana 60 is more "efficient" than an 8 3/4 rear. I've been told by several class racers that in most cases, there has been minimal, if any, change in ET. The Ford 9" is probably the least efficient of the popular rears and the Chevy 12 bolt is the best!




Are you trying to start WW III? Saying a 9" is the least efficient! Oh the humanity! LOL




It would be pointless to argue with the facts.

As far as strength, I'm well aware of my old buddy Quicktree's opinion on 9" vs Dana 60's. But despite the ease of gear changes in a 9", a Dana 60 will handle anything most people would ever need. Once the optimum gear ratio is known, the drop-out center benefit isn't that big of a deal. Besides, the expense of maxing out a 9" is astronomical.


dana 60's are for trucks 9s are for racing, you can't argue facts




A wider gear selection and the simplicity of a drop-out center section are THE ONLY benefits a 9" has over a Dana 60. Pros and a small percentage of hard core sportsman racers will benefit from a 9". Spend enough money and you can make just about anything stronger/lighter/faster than another competitive part.

But back on topic....

If rear end weight is a concern, most likely to go faster, then efficiency should also be a concern. If you install a heavier, but stronger and less expensive rear and don't slow down, it's worth it! If a Dana 60 will result in similar ET's over an 8 3/4", then it will certainly be faster than a Ford 9" which is heavier and even less efficient than an 8 3/4".

Re: weight difference 8 3/4, 9 in and d60 [Re: Locomotion] #1770142
03/03/15 08:48 PM
03/03/15 08:48 PM
Joined: Oct 2007
Posts: 3,978
Hilltown Pa
1967dartgt Offline
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Quote:

Quote:

Quote:

Quote:

Quote:

FYI, while there are obvious weight differences, the Dana 60 is more "efficient" than an 8 3/4 rear. I've been told by several class racers that in most cases, there has been minimal, if any, change in ET. The Ford 9" is probably the least efficient of the popular rears and the Chevy 12 bolt is the best!




Are you trying to start WW III? Saying a 9" is the least efficient! Oh the humanity! LOL




It would be pointless to argue with the facts.

As far as strength, I'm well aware of my old buddy Quicktree's opinion on 9" vs Dana 60's. But despite the ease of gear changes in a 9", a Dana 60 will handle anything most people would ever need. Once the optimum gear ratio is known, the drop-out center benefit isn't that big of a deal. Besides, the expense of maxing out a 9" is astronomical.


dana 60's are for trucks 9s are for racing, you can't argue facts




A wider gear selection and the simplicity of a drop-out center section are THE ONLY benefits a 9" has over a Dana 60. Pros and a small percentage of hard core sportsman racers will benefit from a 9". Spend enough money and you can make just about anything stronger/lighter/faster than another competitive part.

But back on topic....

If rear end weight is a concern, most likely to go faster, then efficiency should also be a concern. If you install a heavier, but stronger and less expensive rear and don't slow down, it's worth it! If a Dana 60 will result in similar ET's over an 8 3/4", then it will certainly be faster than a Ford 9" which is heavier and even less efficient than an 8 3/4".





So your not considering the double bearing on pinion, aluminum center section, the avaibilty of chromoly housings, bolt through main caps and the ability to back brace benefits? Weird I would consider all of them pluses.


Brett Miller W9 cnc'd heads
STR Chassis fabraction
Re: weight difference 8 3/4, 9 in and d60 [Re: 1967dartgt] #1770143
03/03/15 08:54 PM
03/03/15 08:54 PM
Joined: Jan 2007
Posts: 774
Midland,Tx
wyldebill Offline OP
super stock
wyldebill  Offline OP
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Midland,Tx
sorry i asked.

Re: weight difference 8 3/4, 9 in and d60 [Re: wyldebill] #1770144
03/03/15 09:02 PM
03/03/15 09:02 PM
Joined: Jun 2003
Posts: 52,968
Romeo MI
MR_P_BODY Offline
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MR_P_BODY  Offline
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Romeo MI
Quote:

sorry i asked.




Bee Crazy gave you some decent numbers.. but even Hot Rod
said he brakes on the 9" were VERY heavy being they
were the LARGE drums

W/O BRAKES W/BRAKES

12-bolt 171 210
Strange S60 191 230
Currie 9-inch 174 238

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