Re: 9.25 vs 8.75
[Re: redraptor]
#1609806
04/20/14 10:14 AM
04/20/14 10:14 AM
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Joined: Aug 2007
Posts: 1,513 AZ
Mike P
pro stock
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pro stock
Joined: Aug 2007
Posts: 1,513
AZ
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I've run several of both in various projects (currenly have a 9 1/4 in the 57 Plymouth with a 1st Gen Hemi and 4 speed).
I personally like the drop out center section of the 8 3/4 but I can find the 9 1/4s for about 1/2 the price of the 8 3/4s.
As far as strength and reliability my experience is that is about a wash.
1957 Plymouth (Hemi, Dual Quads, A833 4 Speed 9 1/4 w 4.10) Sold 1937 Dodge Pickup (Hemi, 6X2 intake, 46RH, Dana 60 w 4.56) Sold 1968 Plymouth Valiant 2dr sedan (354 HEMI, 46RH w/4.30 gears)
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Re: 9.25 vs 8.75
[Re: Mike P]
#1609808
04/20/14 10:32 AM
04/20/14 10:32 AM
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Joined: Mar 2007
Posts: 9,336 South-Central (Sebring), FL
Commando1
master
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master
Joined: Mar 2007
Posts: 9,336
South-Central (Sebring), FL
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Quote:
The guy wanting a center section has a twin turbo setup currently running 13s but he said he's upgrading turbos to run 10s.
Actually, shame on this guy. IF he can afford a car like that and run those numbers, he SHOULD have already known the answer and the discussion closed.
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Re: 9.25 vs 8.75
[Re: Commando1]
#1609809
04/20/14 01:26 PM
04/20/14 01:26 PM
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Joined: Oct 2003
Posts: 21,345 Marysville, O-H-I-O
70Cuda383
Too Many Posts
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Too Many Posts
Joined: Oct 2003
Posts: 21,345
Marysville, O-H-I-O
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Lots of 4,000 lb Dakotas with stock 9.25s in them running 11s. And even a handful into the 10s Seems strong enough to me.
**Photobucket sucks**
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Re: 9.25 vs 8.75
[Re: Commando1]
#1609810
04/20/14 01:51 PM
04/20/14 01:51 PM
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Joined: Aug 2006
Posts: 8,064 Iowa
76dodgeboy
OP
master
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OP
master
Joined: Aug 2006
Posts: 8,064
Iowa
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Quote:
Quote:
The guy wanting a center section has a twin turbo setup currently running 13s but he said he's upgrading turbos to run 10s.
Actually, shame on this guy. IF he can afford a car like that and run those numbers, he SHOULD have already known the answer and the discussion closed.
He's wanting 8.75 stuff Not 9.25. the kid is the one saying through 9.25 is better. I mentioned converting a truck D60 over to 5lug and told him to contact DoctorDiff
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Re: 9.25 vs 8.75
[Re: 76dodgeboy]
#1609812
04/27/14 01:59 PM
04/27/14 01:59 PM
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Joined: Oct 2005
Posts: 4,954 WI
Dcuda69
master
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master
Joined: Oct 2005
Posts: 4,954
WI
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Quote:
The guy wanting a center section has a twin turbo setup currently running 13s
Ummm....am I the only one here that thinks he has more issues than just the rear end???
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Re: 9.25 vs 8.75
[Re: Dcuda69]
#1609813
04/27/14 02:23 PM
04/27/14 02:23 PM
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Joined: Nov 2007
Posts: 21,832 Kirkland, Washington
Pacnorthcuda
Too Many Posts
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Too Many Posts
Joined: Nov 2007
Posts: 21,832
Kirkland, Washington
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Quote:
Quote:
The guy wanting a center section has a twin turbo setup currently running 13s
Ummm....am I the only one here that thinks he has more issues than just the rear end???
Maybe it's a twin turbo slant 6 in a C body?
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Re: 9.25 vs 8.75
[Re: 70Cuda383]
#1609815
04/27/14 05:17 PM
04/27/14 05:17 PM
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Joined: Feb 2010
Posts: 18,493 Granite Bay CA
Kern Dog
Striving for excellence
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Striving for excellence
Joined: Feb 2010
Posts: 18,493
Granite Bay CA
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Quote:
Lots of 4,000 lb Dakotas with stock 9.25s in them running 11s. And even a handful into the 10s
Seems strong enough to me.
The issue with C clip rearends was made famous by GENERIC Motors. The Mopar 8 1/4" and 9 1/4" axles do not have the same type of failures.
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Re: 9.25 vs 8.75
[Re: Kern Dog]
#1609817
04/27/14 05:35 PM
04/27/14 05:35 PM
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Joined: Oct 2005
Posts: 8,882 Ontario, Canada
Stanton
Don't question me!
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Don't question me!
Joined: Oct 2005
Posts: 8,882
Ontario, Canada
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Quote:
The issue with C clip rearends was made famous by GENERIC Motors. The Mopar 8 1/4" and 9 1/4" axles do not have the same type of failures.
The only downside to the 9-1/4 is the cost of aftermarket parts - but then if you drive a Mopar you're already used to that! FWIW, the 9-1/4 is a true "Mopar" item - unlike the dana. The strength comes from the ring gear size so the 9-1/4 should be stronger than anything but a dana - given the same quality of gear in each. It is apparently easier to work on than a dana.
If you were going to buy a rear end and then shorten it, swap gears and diff, etc, etc, then there's no excuse not to go with a 9-1/4 versus an 8-3/4.
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Re: 9.25 vs 8.75
[Re: BulletBob]
#1609820
04/27/14 10:23 PM
04/27/14 10:23 PM
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Joined: Oct 2005
Posts: 8,882 Ontario, Canada
Stanton
Don't question me!
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Don't question me!
Joined: Oct 2005
Posts: 8,882
Ontario, Canada
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Quote:
mine failed when I broke it mud riding an 80' model I had once
That tire/wheel,axle stub & brake drum came out of there just a fast as my old 66 GTO axle did when introduced to slicks & 550 ft lbs of torque & a 4800 rpm clutch dump
I don't see the difference
You could take an axle out of a Kenworth big rig and stuff it under your car and in the right circumstances break it! That doesn't mean its a weak rear end !!!
My feeling is that a 9-1/4 would not break under the same circumstances as that POS GM unit. However, the GM unit would not have lasted as long as the 9-1/4 in the mud.
If you're going to compare things, do it on equal terms !!!
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