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| Determining gear ration on 7.25 https://slantsix.org/forum/viewtopic.php?t=46253 |
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| Author: | Daddiojoe [ Thu Sep 08, 2011 4:11 pm ] |
| Post subject: | Determining gear ration on 7.25 |
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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| Author: | wjajr [ Thu Sep 08, 2011 4:23 pm ] |
| Post subject: | |
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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| Author: | Doc [ Thu Sep 08, 2011 5:01 pm ] |
| Post subject: | |
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   
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| Author: | raPoM [ Thu Sep 08, 2011 5:09 pm ] |
| Post subject: | |
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. |
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| Author: | Mike'68Dart [ Thu Sep 08, 2011 5:15 pm ] |
| Post subject: | |
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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| Author: | Daddiojoe [ Fri Sep 09, 2011 7:57 pm ] |
| Post subject: | |
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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| Author: | raPoM [ Fri Sep 09, 2011 8:19 pm ] |
| Post subject: | |
Cool! If that 7 1/4 is for sale i would buy it from you,im looking for a 3.23 rear. |
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| Author: | bmweater [ Wed Sep 28, 2011 2:19 pm ] |
| Post subject: | |
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 |
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| Author: | Fopar [ Wed Sep 28, 2011 2:55 pm ] |
| Post subject: | |
Send madmax/6 a pm, he might have one and he is in Long Beach. Richard |
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| Author: | Doc [ Wed Sep 28, 2011 3:09 pm ] |
| Post subject: | |
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 |
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| Author: | bmweater [ Thu Sep 29, 2011 10:35 am ] |
| Post subject: | |
Awesome thanks guys! I will pm you |
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