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FINALLY - C7 3.90 and 4.10 Differential Gear Sets

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FINALLY - C7 3.90 and 4.10 Differential Gear Sets

 
Old 02-10-2019, 09:59 AM
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Pumba
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Default FINALLY - C7 3.90 and 4.10 Differential Gear Sets

Ladies and Gentlemen,

After three years of development I am pleased to announce that C7 3.90 and 4.10 differential gear sets are in country and ready for sale and installation. Please contact Jeremy at RPM Transmission - (800) 406-1109, x 201.

Suggested ratios:

- Stingray =
4.10

- Grand Sport = 3.90

- Z06 and ZR1 = 3.90

Enjoy ! ! !
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Last edited by Pumba; 02-10-2019 at 10:00 AM.
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Old 02-10-2019, 12:58 PM
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awesome!

how does this affect eLSD functionality?
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Old 02-10-2019, 03:12 PM
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Best news, awesome!
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Old 02-10-2019, 08:54 PM
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JHEBERT
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Originally Posted by brothercheeze View Post
awesome!

how does this affect eLSD functionality?
no adverse effects at all, so long as the elsd clutch bleed procedure is followed after install.
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Old 02-10-2019, 10:52 PM
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What will installing a 4.10 change?
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Old 02-11-2019, 07:36 AM
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Originally Posted by Matthewstorm View Post
What will installing a 4.10 change?
- You will have 19% more torque in each gear, improved acceleration, and far more fun than with the stock 3.42 gear set.

Last edited by Pumba; 02-11-2019 at 07:38 AM.
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Old 02-11-2019, 02:39 PM
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Originally Posted by Pumba View Post
- You will have 19% more torque in each gear, improved acceleration, and far more fun than with the stock 3.42 gear set.
What are the adverse effects?
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Old 02-11-2019, 03:31 PM
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Originally Posted by GoatHead View Post
What are the adverse effects?
Speeding tickets.
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Old 02-11-2019, 03:36 PM
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Originally Posted by GoatHead View Post
What are the adverse effects?
Lower MPG, IMO a waste for a daily driver. And for people looking for a performance advantage, competition gear sets are made from a different alloy than street gears, one wonders what these sets are manufactured from?

Last edited by Bubbletop409; 02-11-2019 at 03:41 PM.
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Old 02-11-2019, 10:15 PM
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HECK YEAH DUDE!

Been lurking this topic since 2015... THANK YOU!!!
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Old 02-11-2019, 10:40 PM
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Will these happen to fit a 6th gen camaro m6?
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Old 02-11-2019, 10:55 PM
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What are these gear sets made from? Are they as strong or stronger than OEM?
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Old 02-12-2019, 09:11 AM
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RPM generally knows their **** when it comes to gears. I wouldn't worry.
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Old 02-12-2019, 10:17 AM
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Do A8s have any options out yet?
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Old 02-13-2019, 01:25 PM
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Originally Posted by subieworx View Post
RPM generally knows their **** when it comes to gears. I wouldn't worry.
,

The point being competition gear sets are not recommended for street use, and visa versa, So again what grade of steel are these made of and for what venue were they designed? Street or true competition? And as a side note these are gears for the rear differential, not the transmission as some are assuming.

Last edited by Bubbletop409; 02-13-2019 at 01:27 PM.
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Old 02-14-2019, 08:02 AM
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Originally Posted by Bubbletop409 View Post
,

The point being competition gear sets are not recommended for street use, and visa versa, So again what grade of steel are these made of and for what venue were they designed? Street or true competition? And as a side note these are gears for the rear differential, not the transmission as some are assuming.
Larry,

These gear sets are recommended for both street and competition use. They are stronger than the Linamar factory gears. They are manufactured in Italy, not in China or some other Asian plant. Linamar's OEM differential design is poor. Several C7 users have had spider gear failures. The fix for that is to have a WaveTrac differential installed at the same time as the new gears. In addition, most Forum users spend more time on the street than they do on any track.

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Old 02-14-2019, 04:36 PM
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Anything for the A8
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Old 02-14-2019, 06:10 PM
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I can't think of any reason this would affect traction control or speedometer calibration etc. If not it seems like a winner and makes more sense for my needs than a supercharger which I've considered.
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Old 02-14-2019, 06:34 PM
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I wonder what installation will cost?
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Old 02-14-2019, 08:26 PM
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Pumba,

Is there any ECM recalibration needed to correct the speedometer on M7 cars?


.
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