C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Rear end ?

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Old Jan 25, 2010 | 08:16 PM
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Default Rear end ?

I am going to pickup a new pumpkin tomorrow and I have 2 questions.

1) Where is the G92 stamped on the pumpkin?

2) I cannot remember, do you turn the driveshaft 3 times and the side yoke should turn once or the other way around?

Thanks
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Old Jan 25, 2010 | 08:43 PM
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I'm guessing you're attempting to confirm the ratio of what you're calling "pumpkin"? If that's so and it's just the differential with no cover then your ID will be very easy! You only need to count the number of teeth on the ring gear and also the pinion, then it's simple math!!

If it's a rear with the cover you need to remove the cover anyway to check it.

The tooth count will also generally be stamped on the outer diameter of the ring gear!

The information that is "inked" or "etched" on the housing isn't a confirmation of the build. It only confirms the original factory build!!

I assumed you're talking about a D36. Are you?

To answer your question directly! A single complete rotation of the ring gear would result in the the pinion being rotated the equivalent of the axle ratio. 2.79 (2 3/4), 3.07 (3.0+), 3.31/3.33(3 1/3) etc!

Last edited by WVZR-1; Jan 28, 2010 at 08:21 PM.
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Old Jan 25, 2010 | 08:45 PM
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All the important numbers are stamped on the bottom of the main case , including gear ratio ... gear tooth count numbers are stamped into the ring gear also ....... good luck
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Old Jan 25, 2010 | 10:03 PM
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I think it may be 2 times and count the driveshaft turns to determine gears
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Old Jan 25, 2010 | 10:17 PM
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Yes it is a D36.
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Old Jan 25, 2010 | 11:49 PM
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Originally Posted by surfer92
1) Where is the G92 stamped on the pumpkin?
G92 doesn't exist , it is a admin code
It is on the RPO label to show that a optional ratio
( in C4's case; 3.07 , the only one available ) was fitted to the car in place of the std ratio
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Old Jan 26, 2010 | 05:33 PM
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What is the tooth count on a 3.07 and tooth count on a 2.59?

Lastly, is there anything I can look at to tell if the gears are good, other than the obvious stress cracks?

Thanks!!
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Old Jan 27, 2010 | 11:35 PM
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Originally Posted by rodj
G92 doesn't exist , it is a admin code
It is on the RPO label to show that a optional ratio
( in C4's case; 3.07 , the only one available ) was fitted to the car in place of the std ratio
3.33:1 was also available in 84, though very rare.
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Old Jan 27, 2010 | 11:52 PM
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rotate side yoke once and count the rotations of the driveshaft.

Don't trust the info cast into the casing, the gears could have been changed over time.
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Old Jan 28, 2010 | 12:23 AM
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Originally Posted by cwyates4
rotate side yoke once and count the rotations of the driveshaft.

Don't trust the info cast into the casing, the gears could have been changed over time.
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Old Jan 28, 2010 | 11:54 AM
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Originally Posted by shawn 84&92
3.33:1 was also available in 84, though very rare.
3.33;1 is a d44 ratio. D44 was not available in an '84. The rare optional d36 ratio in the 1984 d36 was 3.31;1.

Race on!!!
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