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Bren67Cuda904
 Post subject: ratio change 7 1/4
PostPosted: Tue Jul 25, 2006 9:44 am 
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Location: Orlando, FL
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I'd like to change my ratio to 3.23 from 2.76. Would it be better to swap in the 7 1/4 rear with 3.23 gears or just use the gears?

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SlantSixDan
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PostPosted: Tue Jul 25, 2006 9:50 am 
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Depends if you can easily find a 7¼" A-body 3.23 rear axle. Be advised that with the extreme engine mods/upgrades you've been talking about, a 7¼" would not be a wise choice. Better to swap in an 8¼" unit.

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Bren67Cuda904
 Post subject:
PostPosted: Tue Jul 25, 2006 9:57 am 
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Location: Orlando, FL
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I may have found one in my area. I ve heard it both ways- some say the 7 1/4 will hold alot and some just like bigger.

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Galactica5
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PostPosted: Tue Jul 25, 2006 5:17 pm 
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Joined: Tue Jul 25, 2006 5:14 pm
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2.76 is a great ratio for the road but I would try to get a heftier rear axle for anything bigger than a stock / six car.
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RossKinder
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PostPosted: Wed Jul 26, 2006 10:07 am 
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Location: Ooltewah, Tennessee
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I may have found one in my area. I ve heard it both ways- some say the 7 1/4 will hold alot and some just like bigger.
That rear end will take a lot - of what it was designed for.
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Bren67Cuda904
 Post subject:
PostPosted: Wed Jul 26, 2006 10:16 am 
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Did any of these 7 1/4 rear come behind any V8s?
My HP goals are in the 250-290 range.

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mopar_nocar
 Post subject:
PostPosted: Wed Jul 26, 2006 11:03 am 
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Joined: Wed Nov 02, 2005 12:47 pm
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Location: Runge, TX
Car Model: 1974 W100; 72 Dart
i had one in a 72 dodge dart w/a 318. it did finally grenade, but that was after MUCH abuse. and many many miles.

put one right back into it and never had a problem...even had one in a Mirada if i am not mistaken also a 318 car. didn't get to break that one, as it was crushed by some guy in a chevy p/u.

erring on the side of caution would say to put an 8.25 in there, but i have a 7.25 in my 65 and until it breaks thats whats gonna' stay.

sb
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Bren67Cuda904
 Post subject:
PostPosted: Wed Jul 26, 2006 2:29 pm 
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What breaks when they go?

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Jeb
 Post subject:
PostPosted: Wed Jul 26, 2006 5:48 pm 
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Location: Rhine, GA
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What breaks when they go?
Usually break the cross shaft or blow the spider gears to pieces. I have already shredded one 7 1/4 under my Duster. Ripped the spider and cross shaft to pieces.

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VDART
 Post subject: 7.25 rear
PostPosted: Wed Jul 26, 2006 6:16 pm 
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Location: wichita ks
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my 69 dart with a 318 has a 7.25 rear --I'm assuming non=performance cars were outfitted with these while the 340's & larger got the beefer stuff!!
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