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AOD with 4.11's ?

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lynchster View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote lynchster Quote  Post ReplyReply Direct Link To This Post Topic: AOD with 4.11's ?
    Posted: 04-May-2009 at 4:28PM
I'm trying to decide on a gear ratio for an engine / trans swap in my "other project" a 79 ranchero. I have a 4.11 posi that I once had in the 72 for a short bit. The math works out to a 2.75 final which seems decent to me. Any thoughts? 
 
Chuck 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote PatsPOS Quote  Post ReplyReply Direct Link To This Post Posted: 05-May-2009 at 1:32PM
Sounds like a good plan to me, especially if you're in the hilly half of the state.  Even 4.30s would net you a 2.88 final drive ratio with the AOD.
 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote starsky76 Quote  Post ReplyReply Direct Link To This Post Posted: 05-May-2009 at 2:24PM
DO IT,DO IT!I concur.I did have the 4.30 aod setup in my stang,was a lot of fun and barked the tires on the 1-2 and 2-3 shifts,it was a blast!
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Post Options Post Options   Thanks (0) Thanks(0)   Quote tod-hog Quote  Post ReplyReply Direct Link To This Post Posted: 05-May-2009 at 2:29PM
Please enlighten the neophyte(s) as to the "math" formula so that we might learn and grow.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote starsky76 Quote  Post ReplyReply Direct Link To This Post Posted: 05-May-2009 at 2:33PM
An AOD overdrive ratio is .68,Times that by your gear ratio and that's your final gear ratio in od.You have been enlightened!
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occupant View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote occupant Quote  Post ReplyReply Direct Link To This Post Posted: 05-May-2009 at 4:46PM
This is my favorite speed/rpm/tire size/axle ratio calculator.

http://www.angelfire.com/fl/procrastination/rear.html

I can figure the speed the car will travel given a set of parameters at whatever engine speed. And I can mess with different ratios and such to find out what would get me the right engine speed on the highways around here.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 351BBGTS Quote  Post ReplyReply Direct Link To This Post Posted: 05-May-2009 at 5:26PM
i tried that site and it never works for me. i always get NaN
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Regul8r Quote  Post ReplyReply Direct Link To This Post Posted: 05-May-2009 at 8:13PM
I just did it and YAHOO I like it!
 
THANKS for the link!
 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote TomiTomi Quote  Post ReplyReply Direct Link To This Post Posted: 05-May-2009 at 11:55PM
Originally posted by 351BBGTS 351BBGTS wrote:

i tried that site and it never works for me. i always get NaN


Perhaps this one is a bit easier to use. You don't have to know the diameter of your wheel in inches.

And here is another, which goes the other way round. It tells you, what RPM you'll have at certain speeds.


Tomi
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 351BBGTS Quote  Post ReplyReply Direct Link To This Post Posted: 06-May-2009 at 4:04PM
Thanks tomi that second one helped alot
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Post Options Post Options   Thanks (0) Thanks(0)   Quote occupant Quote  Post ReplyReply Direct Link To This Post Posted: 07-May-2009 at 3:47PM
Originally posted by 351BBGTS 351BBGTS wrote:

i tried that site and it never works for me. i always get NaN


You can't just hit Enter when you're done.

You have to click the CALCULATE button or it just refreshes the screen.
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