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I know "no" optional gears are available for our 2009-2014 CTS V's and the 2012-2014 Camaro ZL1's, other than the factory 3.73 and 3.23 ratios. I have called countless outlets, manufacturers, speed shops, etc. Two weeks ago I was introduced to John Hale (Nostalgia Funny Car owner and driver) when he was in Bakersfield for the March Meet at Famoso. We talked cars and I mentioned I wanted some 4.10 gears for my CTS V. We got to talking and he said he had sources for custom parts. Well he called me back yesterday and said there was NO ONE making optional gears for our 9.9" rear ends. He also spoke to US Gear (1 of only 3 manufacturers making ring and pinions in the US) and they said a minimum order would be 100 sets, plus they would need a stock (say 3.73) ring and pinion for preliminary measurements. I will be posting this over on Camaro 5 for the ZL1 owners. Hopefully there will be enough interest (we need 100) to get this done. The main advantage of the automatic over our stick shift cars is the overall ratio in 1st gear (auto: 4.03 X 3.23=13.02 overall, manual 2.66 X 3.73= 9.92 overall) and the 4.10's would go a long way to help the disadvantage. If you are interested in these 4.10's please respond here or send me a PM and I will keep a list. If we get anywhere near the 100 we need then I will front the $30,000 needed to order the 100 (@ estimated $300 per set ) and we will run the entire ordering process through John Hales Muscle Car Shop in Dallas.

In addition I will be rebuilding my TR6060 with optional gears to also help. I now have (2.66 , 1.78, 1.30, 1.00,.80,.63) and I will be going to: (3.02, 2.10, 1.43, 1.00, .74, .50) so I will end up with better cruising gas mileage too! 1st gear will end up at 12.38 overall, a difference I'm sure I will notice! 2nd and 3rd won't be too bad either! Stock for stock I think I will be much quicker. At least I'll have more fun!
I’m game
 
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