Author Topic: rear end question  (Read 3463 times)

Tim175

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rear end question
« on: June 13, 2009, 06:04:58 PM »
I have a 1972 mustang fastback 302. Everywhere that i have read has said that this year should have only come with a 9" rear end. However i also read that the 9" should have a "hump" on it and the 8" will not. Mine does not have the "hump" and so im confused. Can anyone clarify for me which one i have or tell me how to find out. Thanks.

Soaring

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Re: rear end question
« Reply #1 on: June 13, 2009, 06:10:15 PM »
Look right above your thread, and you will see the Mustang FAQ section.  Once on there, scroll down to the IX Differential section and read all about it. 
After you have read all about it, come back on here and tell us what differential you have. 

Tim175

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Re: rear end question
« Reply #2 on: June 13, 2009, 08:03:14 PM »
Thanks for the info, and sadly it is an 8" which might explain why my acceleration was not so great. However im still not sure as to which gear ratio i have, any suggestions as to which might be a good one? Its a 302 with an AOD in it. Thanks

Soaring

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Re: rear end question
« Reply #3 on: June 13, 2009, 08:30:35 PM »
There is also information on how to determine the gear ratio of your differential in that section.  Look it up and do some research.  Come back and tell us what it is. 

Tim175

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Re: rear end question
« Reply #4 on: June 13, 2009, 09:39:31 PM »
Thank you, i tried the link for the gear ratio and it does not work :(
is there any other place that you know of that i can go or should i just try google? Thanks

Soaring

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Re: rear end question
« Reply #5 on: June 14, 2009, 12:52:32 AM »
Jack up one tire if you have an open diff, or both tires if you have a working posi or locking differential. Rotate the tire one full revolution for posis and lockers and 2 full revolutions for open diffs. Carefully count the number of full revolutions the driveshaft makes. This is your gear ratio. In other words, if the drive shaft turns 3 turns, you probably have a 3.73 gear ratio. Turning the tire for twice the number of full revolutions and dividing the drive shaft revolutions by two will give you a more accurate reading.


Tim175

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Re: rear end question
« Reply #6 on: June 14, 2009, 12:55:28 AM »
awesome ill give that a try tomorrow morning in the day light. thanks for all the help

 

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