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Re: Aluminum 8 3/4 center section P4876445 [Re: NobleCrusader..] #2733200
01/15/20 12:59 AM
01/15/20 12:59 AM
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Puyallup, WA
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StealthWedge67 Offline
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Originally Posted by Doc Fiberglass
No way ? .. but how about a MAG housing !


You’d still have to put an 8-3/4” ring & pinion in it, wouldn’t ya........ 🤔


LemonWedge - Street heavy / Strip ready - 11.19 @ 119
Re: Aluminum 8 3/4 center section P4876445 [Re: tubtar] #2733222
01/15/20 07:24 AM
01/15/20 07:24 AM
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racerx Offline
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For that kind of money get the 8.75 with the .25 upgrade smile


what is a .25 upgrade?

Re: Aluminum 8 3/4 center section P4876445 [Re: racerx] #2733223
01/15/20 08:15 AM
01/15/20 08:15 AM
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Milwaukee WI
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TRENDZ Offline
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Originally Posted by racerx
For that kind of money get the 8.75 with the .25 upgrade smile


what is a .25 upgrade?

Math.... 8.75 + .25 =


"use it 'till it breaks, replace as needed"
Re: Aluminum 8 3/4 center section P4876445 [Re: TRENDZ] #2733233
01/15/20 08:59 AM
01/15/20 08:59 AM
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in a cattle trailer down by th...
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Guitar Jones Offline
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I had the aluminum center section in my Duster for more than 2 decades. It would still break a ring gear though. When I put a pro gear in it I never had another problem. Many hard trans brake launches on it. I used it in the Scamp when I built that car. The Duster was right at 3000 pounds and the Scamp was 2700.


I never learned to count my blessings, I choose instead to live inside my disasters.

The Scamp is sold, now just two old trucks and one new one.
'92 D250 Club Cab CTD, 47RH conversion, pump tweaks, injectors, rear disc and hydroboost conversion.
'74 W200 Crew Cab 360, NP435, D44, D60 and NP205 divorced transfer case. Magnum 5.2 MPI and NV4500 coming soon.
2019 1500 Long Horn Crew Cab 4WD, 5.7 Hemi.
Re: Aluminum 8 3/4 center section P4876445 [Re: CrAzYMoPaRGuY] #2733237
01/15/20 09:08 AM
01/15/20 09:08 AM
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Marion, South Carolina [><]
an8sec70cuda Offline
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To the OP, I understand your particular situation wanting to make the 8.75 work b/c you've already invested a lot in the housing and all. Not questioning that.

Just saying...one can build a complete Dana 60 from a truck housing for close to what it costs to build one of these aluminum 8.75 centersections and have a rearend that most cars will never break. The 9" is a little more expensive, but worth it IMO, especially when you get faster.


CHIP
'70 hemicuda street car...8.91 at 150.5 mph w/ 4.10s, 8.97 at 152.5 mph w/ 3.54s so far
'69 road runner 440 w/ Indy SRs
'69 road runner 440-6, 4 speed...Dad's ride
'71 Demon 340 resto project
'06 GMC 2500HD LBZ Duramax...toy hauler
'16 Grand Caravan SXT...baby hauler
Re: Aluminum 8 3/4 center section P4876445 [Re: StealthWedge67] #2733238
01/15/20 09:08 AM
01/15/20 09:08 AM
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Posts: 21,121
STAYcation Florida
NobleCrusader.. Online content
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Originally Posted by StealthWedge67
Originally Posted by Doc Fiberglass
No way ? .. but how about a MAG housing !


You’d still have to put an 8-3/4” ring & pinion in it, wouldn’t ya........ 🤔


But as that LooneyVille apimp proclaimed ... a Pro Gear is the ticket !

Re: Aluminum 8 3/4 center section P4876445 [Re: Guitar Jones] #2733251
01/15/20 09:26 AM
01/15/20 09:26 AM
Joined: May 2003
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aZLiViN
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Originally Posted by Guitar Jones
When I put a pro gear in it I never had another problem.


Aren't those about as rare as the aluminum center section this post started with? laugh2

....and I’m still a moron running a Mopar trans so gear breakage = trans tear down and inspect.

S60 was one of the best mods I’ve done, so I have no knowledge on how to make a 8.75 live..... but I know how to kill em!

Re: Aluminum 8 3/4 center section P4876445 [Re: J_BODY] #2733288
01/15/20 10:36 AM
01/15/20 10:36 AM
Joined: Dec 2009
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in a cattle trailer down by th...
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Guitar Jones Offline
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Originally Posted by J_BODY
Originally Posted by Guitar Jones
When I put a pro gear in it I never had another problem.


Aren't those about as rare as the aluminum center section this post started with? laugh2

....and I’m still a moron running a Mopar trans so gear breakage = trans tear down and inspect.

S60 was one of the best mods I’ve done, so I have no knowledge on how to make a 8.75 live..... but I know how to kill em!


4.89 or 4.86 ratio is all you can get so I had to build the car around that. laugh2


I never learned to count my blessings, I choose instead to live inside my disasters.

The Scamp is sold, now just two old trucks and one new one.
'92 D250 Club Cab CTD, 47RH conversion, pump tweaks, injectors, rear disc and hydroboost conversion.
'74 W200 Crew Cab 360, NP435, D44, D60 and NP205 divorced transfer case. Magnum 5.2 MPI and NV4500 coming soon.
2019 1500 Long Horn Crew Cab 4WD, 5.7 Hemi.
Re: Aluminum 8 3/4 center section P4876445 [Re: CrAzYMoPaRGuY] #2733375
01/15/20 03:13 PM
01/15/20 03:13 PM
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jcc Offline
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Originally Posted by CrAzYMoPaRGuY
Diff housing. Backbraced with load bolt provisions, thought I would try everything I could!!! lol


Did you try anything like this?

Pic #46 https://board.moparts.org/ubbthread...ay-protour-practice-car.html#Post1553868


"Respect and Contempt are best served when justly earned"
Re: Aluminum 8 3/4 center section P4876445 [Re: TRENDZ] #2733423
01/15/20 06:12 PM
01/15/20 06:12 PM
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racerx Offline
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Originally Posted by TRENDZ
Originally Posted by racerx
For that kind of money get the 8.75 with the .25 upgrade smile


what is a .25 upgrade?

Math.... 8.75 + .25 =


ok….got it Thaxs,i thought that I have everything none to man done to a 8.75.thought I was missing something.

Re: Aluminum 8 3/4 center section P4876445 [Re: jcc] #2733438
01/15/20 06:44 PM
01/15/20 06:44 PM
Joined: Dec 2009
Posts: 11,658
in a cattle trailer down by th...
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Guitar Jones Offline
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Originally Posted by jcc
Originally Posted by CrAzYMoPaRGuY
Diff housing. Backbraced with load bolt provisions, thought I would try everything I could!!! lol


Did you try anything like this?

Pic #46 https://board.moparts.org/ubbthread...ay-protour-practice-car.html#Post1553868

I'm thinking you have way too much time on your hands, or, you never sleep. laugh2


I never learned to count my blessings, I choose instead to live inside my disasters.

The Scamp is sold, now just two old trucks and one new one.
'92 D250 Club Cab CTD, 47RH conversion, pump tweaks, injectors, rear disc and hydroboost conversion.
'74 W200 Crew Cab 360, NP435, D44, D60 and NP205 divorced transfer case. Magnum 5.2 MPI and NV4500 coming soon.
2019 1500 Long Horn Crew Cab 4WD, 5.7 Hemi.
Re: Aluminum 8 3/4 center section P4876445 [Re: Dave_J] #2733535
01/16/20 04:15 AM
01/16/20 04:15 AM
Joined: Oct 2004
Posts: 16,385
Canada
CrAzYMoPaRGuY Offline OP
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Originally Posted by Dave_J
Originally Posted by J_BODY
[Linked Image]

laugh2..... I remember scoring some of these on closeout at work for $200 dealer cost!

A little Gorilla Glue should fix that right up.

CrAzYMoPaRGuY , is that 650 Morgan horses or 650 Shetland pony's???


Morgan Fairchild??


CrAzYMoPaRGuY
Re: Aluminum 8 3/4 center section P4876445 [Re: DoctorDiff] #2733536
01/16/20 04:20 AM
01/16/20 04:20 AM
Joined: Oct 2004
Posts: 16,385
Canada
CrAzYMoPaRGuY Offline OP
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Originally Posted by DoctorDiff
I have a couple prototype aluminum 742 and 489 8.75" castings, but the production version is not available yet.

If you are looking for strength, I recommend my nodular iron 489 case with HD forged steel caps. Pictures of the HD version can be seen on the right side of the link, below:

https://www.doctordiff.com/8-3-4-nodular-iron-casting.html


Grrrr
My center is a 742 right now, but I'll take a boo.
Are you going to be selling aluminum centers? What do you think of the MP piece, if price wasn't a factor?


CrAzYMoPaRGuY
Re: Aluminum 8 3/4 center section P4876445 [Re: an8sec70cuda] #2733537
01/16/20 04:25 AM
01/16/20 04:25 AM
Joined: Oct 2004
Posts: 16,385
Canada
CrAzYMoPaRGuY Offline OP
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Canada
Originally Posted by an8sec70cuda
To the OP, I understand your particular situation wanting to make the 8.75 work b/c you've already invested a lot in the housing and all. Not questioning that.

Just saying...one can build a complete Dana 60 from a truck housing for close to what it costs to build one of these aluminum 8.75 centersections and have a rearend that most cars will never break. The 9" is a little more expensive, but worth it IMO, especially when you get faster.


If things don't work out with the 8 3/4 I will toss a Dana under the car, no 8.75 + .25 for this guy! Had one in my Demon. Never again


CrAzYMoPaRGuY
Re: Aluminum 8 3/4 center section P4876445 [Re: jcc] #2733538
01/16/20 04:29 AM
01/16/20 04:29 AM
Joined: Oct 2004
Posts: 16,385
Canada
CrAzYMoPaRGuY Offline OP
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Canada
Originally Posted by jcc
Originally Posted by CrAzYMoPaRGuY
Diff housing. Backbraced with load bolt provisions, thought I would try everything I could!!! lol


Did you try anything like this?

Pic #46 https://board.moparts.org/ubbthread...ay-protour-practice-car.html#Post1553868


Can't say as I did! What's the theory behind that??


CrAzYMoPaRGuY
Re: Aluminum 8 3/4 center section P4876445 [Re: jcc] #2733539
01/16/20 04:31 AM
01/16/20 04:31 AM
Joined: Oct 2004
Posts: 16,385
Canada
CrAzYMoPaRGuY Offline OP
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Canada
Originally Posted by jcc
Old school MW Alum vs new School Mopar 8.75


eek
That looks interesting as heck, but I'm sure hard to find!?!?!


CrAzYMoPaRGuY
Re: Aluminum 8 3/4 center section P4876445 [Re: CrAzYMoPaRGuY] #2733551
01/16/20 09:38 AM
01/16/20 09:38 AM
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Puyallup, WA
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StealthWedge67 Offline
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It seems to me that what breaks the 8-3/4 is when the case deflects in the housing, distorting the relationship from axle centerline to case centerline. A backbrace will help hold the axles true, but the case can still distort the front of the housing.
I This allows the axles to pry against the diff / spool and cause the ring gear and pinion to lose their proper relationship.
If this is true, then it seems you could help this issue by triangulating the front of the case to the housing at a point out toward the spring perches. A few years ago I drew up plans for a threaded rod with heim joints from the snubber perch to an outboard point on the face of the housing. My thought was that this could control the case deflection in the housing to some extent, thus keeping the axles square to the case.

Thoughts?


LemonWedge - Street heavy / Strip ready - 11.19 @ 119
Re: Aluminum 8 3/4 center section P4876445 [Re: StealthWedge67] #2733553
01/16/20 09:46 AM
01/16/20 09:46 AM
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Ohio
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jlatessa Offline
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Ohio
Same as the back brace, has to help....Wondered the same thing

Joe

Re: Aluminum 8 3/4 center section P4876445 [Re: jlatessa] #2733590
01/16/20 12:12 PM
01/16/20 12:12 PM
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Posts: 14,839
California
BloFish Offline
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I’ve been very happy with my Randy’s Ring and Pinion aluminum 4.56 center section.


It doesn't really matter whether you win or loose...
as long as you look good doing it!

‘65 A100
‘69 Barracuda
‘06 Mega Cab 2500
‘14 Mercedes-Benz SLK
Re: Aluminum 8 3/4 center section P4876445 [Re: StealthWedge67] #2733650
01/16/20 03:11 PM
01/16/20 03:11 PM
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Trumussia
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jcc Offline
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Originally Posted by StealthWedge67
It seems to me that what breaks the 8-3/4 is when the case deflects in the housing, distorting the relationship from axle centerline to case centerline. A backbrace will help hold the axles true, but the case can still distort the front of the housing.
I This allows the axles to pry against the diff / spool and cause the ring gear and pinion to lose their proper relationship.
If this is true, then it seems you could help this issue by triangulating the front of the case to the housing at a point out toward the spring perches. A few years ago I drew up plans for a threaded rod with heim joints from the snubber perch to an outboard point on the face of the housing. My thought was that this could control the case deflection in the housing to some extent, thus keeping the axles square to the case.

Thoughts?


The above partly answers the OP's previous question he asked. My thinking, looking at the OEM entire housing solution, the cantilevered front housing flange seemed to be the most flexible item, and why I tried to tie it into the back side of the housing,, and if the back side has a brace, so much the better.


"Respect and Contempt are best served when justly earned"
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