Re: Aluminum 8 3/4 center section P4876445
[Re: dIc dOc Deity !]
#2733200
01/15/20 12:59 AM
01/15/20 12:59 AM
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Joined: Jul 2006
Posts: 4,319 Puyallup, WA
StealthWedge67
master
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master
Joined: Jul 2006
Posts: 4,319
Puyallup, WA
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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 - 11.07 @ 120
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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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Joined: Jan 2005
Posts: 2,540 Milwaukee WI
TRENDZ
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master
Joined: Jan 2005
Posts: 2,540
Milwaukee WI
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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"
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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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Joined: Dec 2009
Posts: 20,600 in a cattle trailer down by th...
Guitar Jones
Paddle faster! I hear banjo music!
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Paddle faster! I hear banjo music!
Joined: Dec 2009
Posts: 20,600
in a cattle trailer down by th...
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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.
"Follow me the wise man said, but he walked behind"
'92 D250 Club Cab CTD, 47RH conversion, pump tweaks, injectors, rear disc and hydroboost conversion. '74 W200 Crew Cab 360, NV4500, D44, D60 and NP205 divorced transfer case. Rear disc and hydroboost coming soon! 2019 1500 Long Horn Crew Cab 4WD, 5.7 Hemi.
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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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Joined: Jan 2003
Posts: 13,319 Marion, South Carolina [><]
an8sec70cuda
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 13,319
Marion, South Carolina [><]
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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, 575" Hemi, 727, Dana 60 '69 road runner, 440-6, 18 spline 4 speed, Dana 60 '71 Demon, 340, low gear 904, 8.75 '73 Chrysler New Yorker, 440, 727, 8.75 '90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt '06 GMC 2500HD LBZ Duramax
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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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Joined: Jul 2008
Posts: 30,252 Florida STAYcation
dIc dOc Deity !
The village idiot's idiot
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The village idiot's idiot
Joined: Jul 2008
Posts: 30,252
Florida STAYcation
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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 proclaimed ... a Pro Gear is the ticket !
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Re: Aluminum 8 3/4 center section P4876445
[Re: Guitar Jones]
#2733251
01/15/20 09:26 AM
01/15/20 09:26 AM
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Joined: May 2003
Posts: 13,182 aZLiViN
J_BODY
I Live Here
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I Live Here
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Posts: 13,182
aZLiViN
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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? ....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!
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Re: Aluminum 8 3/4 center section P4876445
[Re: J_BODY]
#2733288
01/15/20 10:36 AM
01/15/20 10:36 AM
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Joined: Dec 2009
Posts: 20,600 in a cattle trailer down by th...
Guitar Jones
Paddle faster! I hear banjo music!
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Paddle faster! I hear banjo music!
Joined: Dec 2009
Posts: 20,600
in a cattle trailer down by th...
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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? ....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.
"Follow me the wise man said, but he walked behind"
'92 D250 Club Cab CTD, 47RH conversion, pump tweaks, injectors, rear disc and hydroboost conversion. '74 W200 Crew Cab 360, NV4500, D44, D60 and NP205 divorced transfer case. Rear disc and hydroboost coming soon! 2019 1500 Long Horn Crew Cab 4WD, 5.7 Hemi.
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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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Joined: Aug 2008
Posts: 4,049 Mo.
racerx
master
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master
Joined: Aug 2008
Posts: 4,049
Mo.
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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.
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Re: Aluminum 8 3/4 center section P4876445
[Re: jcc]
#2733438
01/15/20 06:44 PM
01/15/20 06:44 PM
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Joined: Dec 2009
Posts: 20,600 in a cattle trailer down by th...
Guitar Jones
Paddle faster! I hear banjo music!
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Paddle faster! I hear banjo music!
Joined: Dec 2009
Posts: 20,600
in a cattle trailer down by th...
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I'm thinking you have way too much time on your hands, or, you never sleep.
"Follow me the wise man said, but he walked behind"
'92 D250 Club Cab CTD, 47RH conversion, pump tweaks, injectors, rear disc and hydroboost conversion. '74 W200 Crew Cab 360, NV4500, D44, D60 and NP205 divorced transfer case. Rear disc and hydroboost coming soon! 2019 1500 Long Horn Crew Cab 4WD, 5.7 Hemi.
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Re: Aluminum 8 3/4 center section P4876445
[Re: Dave_J]
#2733535
01/16/20 04:15 AM
01/16/20 04:15 AM
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Joined: Oct 2004
Posts: 16,452 Canada
CrAzYMoPaRGuY
OP
I Live Here
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OP
I Live Here
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Posts: 16,452
Canada
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..... 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
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Re: Aluminum 8 3/4 center section P4876445
[Re: DoctorDiff]
#2733536
01/16/20 04:20 AM
01/16/20 04:20 AM
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Joined: Oct 2004
Posts: 16,452 Canada
CrAzYMoPaRGuY
OP
I Live Here
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OP
I Live Here
Joined: Oct 2004
Posts: 16,452
Canada
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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
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Re: Aluminum 8 3/4 center section P4876445
[Re: an8sec70cuda]
#2733537
01/16/20 04:25 AM
01/16/20 04:25 AM
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Joined: Oct 2004
Posts: 16,452 Canada
CrAzYMoPaRGuY
OP
I Live Here
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OP
I Live Here
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Posts: 16,452
Canada
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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. 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
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Re: Aluminum 8 3/4 center section P4876445
[Re: jcc]
#2733538
01/16/20 04:29 AM
01/16/20 04:29 AM
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Joined: Oct 2004
Posts: 16,452 Canada
CrAzYMoPaRGuY
OP
I Live Here
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OP
I Live Here
Joined: Oct 2004
Posts: 16,452
Canada
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Can't say as I did! What's the theory behind that??
CrAzYMoPaRGuY
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Re: Aluminum 8 3/4 center section P4876445
[Re: jcc]
#2733539
01/16/20 04:31 AM
01/16/20 04:31 AM
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Joined: Oct 2004
Posts: 16,452 Canada
CrAzYMoPaRGuY
OP
I Live Here
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OP
I Live Here
Joined: Oct 2004
Posts: 16,452
Canada
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Old school MW Alum vs new School Mopar 8.75 That looks interesting as heck, but I'm sure hard to find!?!?!
CrAzYMoPaRGuY
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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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Joined: Jul 2006
Posts: 4,319 Puyallup, WA
StealthWedge67
master
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master
Joined: Jul 2006
Posts: 4,319
Puyallup, WA
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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 - 11.07 @ 120
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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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Joined: Nov 2004
Posts: 16,449 On the run…
BloFish
I Live Here
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I Live Here
Joined: Nov 2004
Posts: 16,449
On the run…
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I’ve been very happy with my Randy’s Ring and Pinion aluminum 4.56 center section.
It really doesn't matter whether you win or lose… as long as you look good doing it!
‘65 A100 ‘69 ‘Cuda ‘73 Vega GT ‘06 Mega Cab ‘14 Mercedes SLK
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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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Joined: Dec 2003
Posts: 22,695 Bitopia
jcc
If you can't dazzle em with diamonds..
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If you can't dazzle em with diamonds..
Joined: Dec 2003
Posts: 22,695
Bitopia
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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? 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.
Reality check, that half the population is smarter then 50% of the people and it's a constantly contested fact.
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