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Gear ratio math

Old 09-23-2007, 11:16 AM
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Gear ratio math

ok, I got the front diff out of a 94 p/up 22re 5 speed - I used a punch and marked a tooth on each; the pinion and the ring, and then counted 3 times to make sure I got the same number everytime.

It has 42 on the ring and 11 on the pinion. Do I understand the math correctly that you divide 42/11 to get the ratio? that equals 3.81 - can that be right? seems odd to me.

EDIT - Pictures, cuz everyone likes pictures



Last edited by justinking060310; 09-23-2007 at 11:21 AM.
Old 09-23-2007, 11:25 AM
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Are you sure you counted the pinion gear teeth and not those spider gears?
Old 09-23-2007, 11:31 AM
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yes, they are way in the back, had to look through the bottom. I am positive I counted the pinion

the axle code in the jamb is B03A - which toyota nations chart shows as 8" 4.10 2 pinion

Last edited by justinking060310; 09-23-2007 at 11:34 AM.
Old 09-23-2007, 11:44 AM
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"they"? There is only one pinion gear, its the one that the drive shaft flange bolts to.
Old 09-23-2007, 11:56 AM
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I stand corrected -
"yes, the pinion is way in the back, had to look through the bottom. I am positive I counted the pinion"
Old 09-23-2007, 12:01 PM
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Hmmm... that is odd then. Yes your math is correct.
Old 09-23-2007, 12:30 PM
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ok gents - I have concluded a recent study

ALCOHOL HAS SIGNIFICANT EFFECTS ON MY ABILITY TO COUNT.

Katie just got home and I made her count them a couple of times and she got 41 and 10 every time, so apparently I am mildly retarded

Thanks for putting up with me Dale.

Back to my Capt and Coke,
J

PS... I have a matched set of 4.10 front and rear 4 cyl diffs/axle assemblies for sale.
Old 09-23-2007, 12:59 PM
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LOL, it was probably the coke, try Capt & beer instead. 3/4 shot of Capt Morgan poured directly into the beer We have weak beer here in OK so that's the trick.
Old 09-23-2007, 08:30 PM
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Try making some homebrew, Dale. Customized potency!
Old 09-24-2007, 03:47 AM
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Maybe I will...after I run out of things to do on my truck.
Old 09-24-2007, 09:36 AM
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Sounds like you counted the tooth that you punch marked as "1", then you went around the gear and counted the punched tooth again at the end? Glad to hear you figured it out, though. 4.10's sounds better than 3.81's.
Old 09-24-2007, 06:11 PM
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so tell me,

Did she gripe about the smelly gear lube when you made her stick her face in there?
Old 09-24-2007, 06:20 PM
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nope, I got a tough woman - she likes gear oil, just not in her hair, lol


gallant - you are 100% correct
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