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FS 4.77 09 Complete Rear Diff

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Old 03-29-2009, 11:36 PM
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FS 4.77 09 Complete Rear Diff
Like the title says, I have a complete 09 4.77 rear diff pulled from wrecked car with 500 miles on it.
1200.00
Attached Thumbnails FS 4.77 09 Complete Rear Diff-4.77.jpg  
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Old 03-29-2009, 11:56 PM
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would u sell the 4.77 final drive gear alone
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Old 03-29-2009, 11:58 PM
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TX Gears
Originally Posted by VS8
would u sell the 4.77 final drive gear alone
Sorry, cannot seperate
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Old 03-29-2009, 11:59 PM
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man i want this sooo bad
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Old 03-30-2009, 12:01 AM
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I am in Dallas, Tx.
This is a direct swap.
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Old 03-30-2009, 12:06 AM
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It prob be easier to just swap diffs than the gears alone. plus 4.77 could be for racing, and stock for street use... If i had money id be on this.
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Old 03-30-2009, 12:08 AM
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well im guessin he wouldnt want my 4.44 gears
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Old 03-30-2009, 07:34 AM
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Would this fit on a 2004 AT rx8? I assume it would
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Old 03-30-2009, 08:57 AM
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i'm confused now. i'm finding a new one from mazda for a grand.
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Old 03-30-2009, 09:13 AM
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Gears
Originally Posted by myriadshalaks
i'm confused now. i'm finding a new one from mazda for a grand.
I think that may be for just the ring and pinion?
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Old 03-30-2009, 09:14 AM
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Gears
Originally Posted by rx8shift
Would this fit on a 2004 AT rx8? I assume it would
Yes, it is a direct swap
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Old 03-30-2009, 09:21 AM
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Originally Posted by mrmazda7
I think that may be for just the ring and pinion?
hmm. interested. i got a quote to put it in. mazda says 6.5 hours, but it won't take that long. i figure i can get it put in for around 350.

what sort of gains should i expect?
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Old 03-30-2009, 02:04 PM
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Originally Posted by myriadshalaks
hmm. interested. i got a quote to put it in. mazda says 6.5 hours, but it won't take that long. i figure i can get it put in for around 350.

what sort of gains should i expect?
Youre not going to gain anything. The car will rev up faster in gear so your top mph for each gear will be lower but it will get you up and moving faster.
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Old 03-30-2009, 02:10 PM
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Yes, there will be no power gain. You will just have a little faster 0 to 60 time.
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Old 03-30-2009, 02:12 PM
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Originally Posted by PhantomRX-8
Youre not going to gain anything. The car will rev up faster in gear so your top mph for each gear will be lower but it will get you up and moving faster.
+1 no HP gain if thats what you're asking, its all about the gearing of your car. this would be an awesome upgrade.. so tempted....
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Old 03-30-2009, 05:49 PM
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that counts as a gain. i wasn't thinking hp gains. i meant what exactly was the overall benefit. and this was answered nicely. i had sort of a vague idea about why this would be good. now I know exactly why. so thanks.

and i'm still interested in this.
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Old 03-30-2009, 10:11 PM
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On a stock tire RX-8, the difference at the top of 2nd gear at 9k rpm is 68.84 mph versus 64.07 mph with the 4.77 gearing.

Mechanical leverage (torque) goes up by a little over 100 ft/lbs at the rear tires.

Yes, I am **** enough to have built an entire spread sheet which calculates this, taking into account everything down to exact tire circumference.
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Old 03-30-2009, 11:58 PM
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Originally Posted by PhotoMunkey
On a stock tire RX-8, the difference at the top of 2nd gear at 9k rpm is 68.84 mph versus 64.07 mph with the 4.77 gearing.

Mechanical leverage (torque) goes up by a little over 100 ft/lbs at the rear tires.

Yes, I am **** enough to have built an entire spread sheet which calculates this, taking into account everything down to exact tire circumference.
Or you can just use an RPM calculator online and save you some trouble! Lol!!
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Old 04-01-2009, 11:40 AM
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is this sold or what? i asked for more pics -- closer, underside-- to assure me that it wasn't damaged in the wreck, but nothing.
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Old 04-01-2009, 11:49 AM
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I will post pics this evening
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Old 04-01-2009, 12:17 PM
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im sorry, but what ration is our stock diff?
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Old 04-01-2009, 12:38 PM
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4.44
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Old 04-01-2009, 12:46 PM
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thanks, so will the speedo or odometer reads not correctly?
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Old 04-01-2009, 01:21 PM
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no it has nothing to do with the speedometer
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Old 04-01-2009, 01:29 PM
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Originally Posted by PhantomRX-8
Or you can just use an RPM calculator online and save you some trouble! Lol!!
Rpm calculator doesn't account for tire size does it? Or calculate ft/lbs of torque in each gear?
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