What's common for a 7.25? I took it out of a 67 Dart. By turning the wheel and counting revolutions, I'm getting close to a 3:91. Is that going to be correct? Can't find a tag w/ the info.

Thanks,

Joe

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Joe Hoppe

71 D100 225 Super Six 727 AT on 2008 Crown Vic CopCar frame

64 Valiant Wagon 225 904 AT 3:23 8.75"

Joe,

I going to guess that you figured something wrong. 3.91 seems to be rather low geared coming from a Dart. Take a look here for method of calculating rear end ratios.

Bill

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67' Dart GT Convertible; the old Chrysler Corp.
82' LeBaron Convertible; the new Chrysler Corp
07' 300 C AWD; Now by Fiat, the old new Chrysler LLC

The gear ratio is stamped onto the ring gear but you have to remove the cover to see it.

Many 7 1/4 also have the gear ratio stamped into the axle housing but you can not be sure if that factory stamped number is still true...
Rear-ends get rebuilt or "repaired" and gears get changed in the process so take that stamping as "ref. only".
DD

Generally on a 67 if it was an automatic it has a 2.93 and if it was a manual it would be 3.23.

I didnt know there was another Austin slant sixer! We should hang out!

Jared in Round Rock.

Well...Doc beat me to it. I was just out getting pictures of my old rearend out of my '68 Dart, and he just posted what I was going to....lol


Mike

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An officialis Tyrde-Browne Racing membrum

Thanks, guys. Looks like I've got a 3:23 (even if it did come from in back of a 904).

Jared--check out www.austinmopars.org ---it isn't only muscle cars. I agree we should get together some time.

Thanks again,

Joe

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Joe Hoppe

71 D100 225 Super Six 727 AT on 2008 Crown Vic CopCar frame

64 Valiant Wagon 225 904 AT 3:23 8.75"

Cool! If that 7 1/4 is for sale i would buy it from you,im looking for a 3.23 rear.

Same here! I have been looking for a nice 7.25 but they are either not available or super expensive. I even looked into getting higher gears from my rear...a place here in Huntington Beach, Ca quoted me $900 for gears and labor. Seems wayy to high but...it keeps it stock decisions decisions decisions

Send madmax/6 a pm, he might have one and he is in Long Beach.

Richard

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Part of Tyrde-Browne Racing

I have a couple of the 3.23 7 1/4 units up here near San Francisco, CA
These ship pretty resonably using FedEx Ground, if you just need the housing & gears. (no axle shafts or brake assemblies... swap-over to the ones you currently have)
DD

Awesome thanks guys! I will pm you