Re: 8 3/4 CENTER-SECTION WEIGHT
[Re: 451Cuda]
#2000204
01/28/16 01:04 AM
01/28/16 01:04 AM
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Joined: Jul 2004
Posts: 19,318 State of confusion
Thumperdart
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But a Dana 60 was an optional rear in certain Dodges and Plymouths... I understand and agree they are great but I`m sticking to the 8 3/4 for now and know of low 9 second cars running 8 3/4`s w/success and it will get lighter.......
72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....
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Re: 8 3/4 CENTER-SECTION WEIGHT
[Re: Cab_Burge]
#2000249
01/28/16 02:07 AM
01/28/16 02:07 AM
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Joined: Apr 2013
Posts: 345 Nebraska
451Cuda
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Nebraska
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But a Dana 60 was an optional rear in certain Dodges and Plymouths... It was mandatory in all the 426 Hemi and 4 speed cars with 3.54 and 4.10 ratio from 1967 to 1971 Right, I'm just helping Thumperdart justify it as a Mopar rear axle lol.
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Re: 8 3/4 CENTER-SECTION WEIGHT
[Re: DoctorDiff]
#2000266
01/28/16 02:49 AM
01/28/16 02:49 AM
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Joined: Jul 2004
Posts: 19,318 State of confusion
Thumperdart
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This HD nodular iron 489 case has the same heavy forged steel caps (with allen bolts) used on 3.25" bore 9" castings. In addition, the casting is much thicker than stock and it does not have any ID numbers on the side. They have been on the market for about 3 years. So what`s the story Cass about yukon rating em at 500 hp?
72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....
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Re: 8 3/4 CENTER-SECTION WEIGHT
[Re: Thumperdart]
#2000371
01/28/16 12:32 PM
01/28/16 12:32 PM
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Joined: Oct 2007
Posts: 4,210 New York
polyspheric
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Rating by HP is pretty silly. What breaks gears is weight + traction + starting line torque (+ trans brake, if used). Peak power has nothing to do with it. High 7 second turbo Powerglide Fox bodies use the original (modified) 8.8 axle.
Boffin Emeritus
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Re: 8 3/4 CENTER-SECTION WEIGHT
[Re: polyspheric]
#2000445
01/28/16 02:40 PM
01/28/16 02:40 PM
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Joined: Jul 2004
Posts: 19,318 State of confusion
Thumperdart
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That`s why I asked the question and was told loading and unloading the tires has a greater impact than dead hooking and my 4x4 friends snap axles on a continuous basis when the tires leave the ground then slam back down under power. Bottom line...........are the Cass nodular center sections stronger than the factory units?
72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....
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Re: 8 3/4 HOUSING WEIGHT
[Re: Just-a-dart]
#2000446
01/28/16 02:41 PM
01/28/16 02:41 PM
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Posts: 19,318 State of confusion
Thumperdart
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Thankxxx man. Did some research today on nodular iron vs factory cast iron and the nodular seems way stronger and Dr. Diff agrees and for $300 bucks w/billet caps and adjusters, I can`t go wrong and don`t want a truck or ford rear under my car. Mine has lasted longer than most into the 9`s at 3200+ lbs w/30 spline axles so this along w/35 spline axles, a new spool and around 3000 lbs.(for now), I should be golden........... I have been running that case in the 489 style, 4.30 gears, and 35 spline set up for 3 or 4 years. Ring and pinion life sucks for me at about 80 passes. My Dart is about 3300lbs, normally 1.38-1.42 60' times A 9" is going under the car soon. Save your money Dom How many runs were you getting out of the stock rears.......
72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....
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Re: 8 3/4 HOUSING WEIGHT
[Re: Thumperdart]
#2000474
01/28/16 03:19 PM
01/28/16 03:19 PM
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Joined: Feb 2011
Posts: 4,302 Nebraska
72Swinger
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I think the main 2 weaknesses of an 8 3/4 are the caps and the housing flex. After those are fixed, then its the pinion and then the ring gear teeth are small.
Mopar to the bone!!!
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Re: 8 3/4 HOUSING WEIGHT
[Re: 72Swinger]
#2000479
01/28/16 03:23 PM
01/28/16 03:23 PM
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Joined: Jul 2004
Posts: 19,318 State of confusion
Thumperdart
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Agreed and my stock length a-body housing has a back-brace but still has stock caps............
72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....
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Re: 8 3/4 HOUSING WEIGHT
[Re: Thumperdart]
#2000513
01/28/16 04:04 PM
01/28/16 04:04 PM
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Joined: Jan 2003
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dogdays
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Nodular cast iron, also called malleable iron, has 50% more stiffness than gray cast iron. It also has more tensile strength than gray cast iron.
That means that if the new nodular cast housing was exactly the same as the OEM gray cast housings, it would be way stronger.
Since we have been told that it is a beefed up casting, as well as being Nodular, it is way, way stronger than a stocker.
It is the gears trying to push apart, as mentioned above, that causes most failures. A stiffer casting will resist more force.
Back in the day, racers who were into the 9" looked for the "N" on the casting to pick the most desirable ones. That was before you could order any 9" part from a catalog.
R.
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Re: 8 3/4 HOUSING WEIGHT
[Re: dogdays]
#2000562
01/28/16 05:32 PM
01/28/16 05:32 PM
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Joined: Jul 2004
Posts: 19,318 State of confusion
Thumperdart
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Nodular cast iron, also called malleable iron, has 50% more stiffness than gray cast iron. It also has more tensile strength than gray cast iron.
That means that if the new nodular cast housing was exactly the same as the OEM gray cast housings, it would be way stronger.
Since we have been told that it is a beefed up casting, as well as being Nodular, it is way, way stronger than a stocker.
It is the gears trying to push apart, as mentioned above, that causes most failures. A stiffer casting will resist more force.
Back in the day, racers who were into the 9" looked for the "N" on the casting to pick the most desirable ones. That was before you could order any 9" part from a catalog.
R. THIS is the kind of info we need to know and follows up on everything I`ve read in the last few weeks along w/talking to Cass.......
72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....
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Re: 8 3/4 HOUSING WEIGHT
[Re: Cab_Burge]
#2000605
01/28/16 06:51 PM
01/28/16 06:51 PM
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Joined: Jul 2004
Posts: 19,318 State of confusion
Thumperdart
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So then are we in agreement that nodular is stronger than all of the above?
72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....
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Re: 8 3/4 CENTER-SECTION WEIGHT
[Re: Thumperdart]
#2000606
01/28/16 06:55 PM
01/28/16 06:55 PM
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Joined: Oct 2007
Posts: 4,210 New York
polyspheric
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slam back down under power
Definitely, all of the rotating energy of the tires, wheels, axles etc. already up to speed - and the tire contact patch connects to the chassis, which is almost stalled.
This was famous for breaking motorcycle transmissions. When the rear wheel went airborne (a jump) and the rider didn't roll the throttle off - the case explodes as the gears try to separate to relieve the stress.
Boffin Emeritus
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Re: 8 3/4 HOUSING WEIGHT
[Re: 72Swinger]
#2000648
01/28/16 07:41 PM
01/28/16 07:41 PM
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Joined: Nov 2004
Posts: 6,890 North Alabama
Monte_Smith
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I think the main 2 weaknesses of an 8 3/4 are the caps and the housing flex. After those are fixed, then its the pinion and then the ring gear teeth are small. THE weakness of the 8.75 is the case itself and the pinion stem. The torque flexes the case and lets the pinion move away from the ring gear, which shells gears. When you get that crap going on, it pushes the cap off, as the mashed teeth are trying to roll over themselves. The billet cap will maybe keep it from breaking the cap, but does NOTHING to address what caused the failure in the first place, which is case and pinion stem flex. This is where guys say that the 8.75 pinion stem is about the same as DANA, which is true...........BUT, the DANA housing is massive AROUND the pinion, which helps support it and the case doesn't flex. You can't do that around the pinion in an 8.75, because it's a drop out . You CAN make it out of a little better metal, but you can't increase the support area. So the drop out is better, but not FIXED
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Re: 8 3/4 HOUSING WEIGHT
[Re: Thumperdart]
#2000701
01/28/16 09:11 PM
01/28/16 09:11 PM
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Joined: Feb 2011
Posts: 4,302 Nebraska
72Swinger
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Nebraska
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I think housing flex is the reason for cap breakage in a lot of cases.
Mopar to the bone!!!
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Re: 8 3/4 HOUSING WEIGHT
[Re: Just-a-dart]
#2000768
01/28/16 11:03 PM
01/28/16 11:03 PM
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Joined: Mar 2007
Posts: 1,608 Rudolph, Ohio
moparguy7074
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Thankxxx man. Did some research today on nodular iron vs factory cast iron and the nodular seems way stronger and Dr. Diff agrees and for $300 bucks w/billet caps and adjusters, I can`t go wrong and don`t want a truck or ford rear under my car. Mine has lasted longer than most into the 9`s at 3200+ lbs w/30 spline axles so this along w/35 spline axles, a new spool and around 3000 lbs.(for now), I should be golden........... I have been running that case in the 489 style, 4.30 gears, and 35 spline set up for 3 or 4 years. Ring and pinion life sucks for me at about 80 passes. My Dart is about 3300lbs, normally 1.38-1.42 60' times A 9" is going under the car soon. Save your money Dom Have you ever tried a 4.10 gear?
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