Dart 7 & 1/4" Rear
#855729
11/17/10 12:28 AM
11/17/10 12:28 AM
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Joined: Nov 2004
Posts: 1,601 Hatfield,Pa.
bigD
OP
top fuel
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OP
top fuel
Joined: Nov 2004
Posts: 1,601
Hatfield,Pa.
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Will this stand up to a mild 273?,D
Last edited by bigD; 11/17/10 12:29 AM.
2015 Chrysler200s,2008 Charger R/T R&T,1999 Dakota R/T,1999 Viper ACR,1968 Charger R/T.
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Re: Dart 7 & 1/4" Rear
[Re: None2Slow]
#855731
11/17/10 02:04 AM
11/17/10 02:04 AM
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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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The 7 1/4 axle was the standard axle behind slant 6 and 318 cars. Its a decent unit with great reliability. Yeah, they break, but I have seen 8 1/4 axle shafts break at the hub without being abused. It really comes down to how the axle is treated. Even using a 3 or 4 speed trans doesnt spell instant death. These axles came behind 318 3 speed cars too. What kills these and other axles ? Abuse and neglect. Rev it up and dump the clutch? Peel out alot? Buy some good shoes. Also, and this also applies to early transmission failure...When spinning the tires on loose surfaces,(Water, dirt, gravel) LIFT off the gas when approaching an area with better traction. Its the sudden shock loads that cause the greatest damage.
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Re: Dart 7 & 1/4" Rear
[Re: bigD]
#855732
11/17/10 02:17 AM
11/17/10 02:17 AM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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supposedly the spider gears are the weak link & Randy's sells them & maybe Doc does also. I'm gonna try a welded spider &&1/4 on a circle burner & see if it holds up. The ~100 lbs?? or so less unsprung weight (from an 8&3/4) will be very nice.
live every 24 hour block of time like it's your last day on earth
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Re: Dart 7 & 1/4" Rear
[Re: bigD]
#855735
11/17/10 11:18 AM
11/17/10 11:18 AM
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Joined: Nov 2004
Posts: 1,601 Hatfield,Pa.
bigD
OP
top fuel
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OP
top fuel
Joined: Nov 2004
Posts: 1,601
Hatfield,Pa.
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Heres some more info: 904 auto,2.73 open rear. Plan on freeway drives and crusin,no racing.D,
2015 Chrysler200s,2008 Charger R/T R&T,1999 Dakota R/T,1999 Viper ACR,1968 Charger R/T.
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Re: Dart 7 & 1/4" Rear
[Re: bigD]
#855738
11/17/10 11:17 PM
11/17/10 11:17 PM
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Joined: Apr 2010
Posts: 1,216 Under My Car
Mopar_Country
pro stock
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pro stock
Joined: Apr 2010
Posts: 1,216
Under My Car
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Quote:
Heres some more info: 904 auto,2.73 open rear. Plan on freeway drives and crusin,no racing.D,
If you follow this recipe, it will be fine. Keep in mind they won't handle to many burnouts as a rule.
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Re: Dart 7 & 1/4" Rear
[Re: bigD]
#855740
11/18/10 11:01 AM
11/18/10 11:01 AM
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Joined: May 2003
Posts: 3,070 N.W. Florida
Fat_Mike
master
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master
Joined: May 2003
Posts: 3,070
N.W. Florida
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My old '65 Dart came from the factory with a 7.25 behind a 273/4 spd. Can't say how many times it was gone through before I got my hands on it, but it had a ton of miles on it and was still there.
Last edited by Fat_Mike; 11/18/10 04:44 PM.
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Re: Dart 7 & 1/4" Rear
[Re: Fat_Mike]
#855741
11/18/10 01:31 PM
11/18/10 01:31 PM
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Joined: Jan 2003
Posts: 3,122 Auburn WA
Dave_J
master
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master
Joined: Jan 2003
Posts: 3,122
Auburn WA
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I pulled the DORF 9" out of my 65 Cuda and replaced it with a LBP 7 1/4 2.94:1 SG from a 74 Dart Swinger. It stayed behind the 383 Magnumn for 2 years when I heard a loud grinding noise on the way home from work. I made it home and dug out my 8 1/4 - 8 3/8 hybred with 3.55:1 SG. Hung it on the springs ok. when moving the 7 1/4 around the garage, the left brake drum popped off and the brakeshoes were delamanated and that was the grinding noise I had heard.
Retired, US ARMY 1973-1994 ASE mechanic, Electrical 1994-1997 Retired GTE/VERIZON/FRONTIER 1997-2015
Posting cheap tech help (CRAP) here since Nov 97, 1000's of posts, some may be good.
03 Suzuki Burgman 650(Burger King) Scooter 65 Formula S Cuda 78 Little Red Express Truck 98 Buick Regal (wifes car)
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Re: Dart 7 & 1/4" Rear
[Re: bigD]
#855743
11/19/10 01:05 PM
11/19/10 01:05 PM
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Joined: Nov 2004
Posts: 1,601 Hatfield,Pa.
bigD
OP
top fuel
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OP
top fuel
Joined: Nov 2004
Posts: 1,601
Hatfield,Pa.
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Thanks for the replys .I have a bunch of smallblock stuff left over from the Coronet and a couple of 273s(one with 904 trans) that were given to me,slant is smoking so I'd thought I use up all my leftovers on this project,D.
2015 Chrysler200s,2008 Charger R/T R&T,1999 Dakota R/T,1999 Viper ACR,1968 Charger R/T.
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