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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awesome!

how does this affect eLSD functionality?

Best news, awesome!

no adverse effects at all, so long as the elsd clutch bleed procedure is followed after install.

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.

What are the adverse effects?

Speeding tickets.

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?

HECK YEAH DUDE!

Been lurking this topic since 2015... THANK YOU!!! :thumbs:

Will these happen to fit a 6th gen camaro m6?

What are these gear sets made from? Are they as strong or stronger than OEM?

RPM generally knows their shit when it comes to gears. I wouldn't worry.

Do A8s have any options out yet?

,

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.

Anything for the A8

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.

I wonder what installation will cost?

Pumba,

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


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