FRC tranny question
Thread Starter
Instructor
Joined: Dec 2008
Posts: 163
Likes: 3
From: Sparta TN
FRC tranny question
Is the gear ratios in the tranny of a FRC the same as a zo6 tranny? Im going to do a gear change and ive heard if its has a zo6 tranny i need to buy 3:90s. If it has a regular c5 tranny i need 4:10s?? Any info would be appreciated...thanks.
Melting Slicks
Joined: May 2006
Posts: 2,303
Likes: 40
From: Edmonton Alberta
I believe the axle ratio for all FRC's were 3:42, (correct me if I'm wrong). That's not too bad considering what you intend to use the car for.
Last edited by B-Vette; Apr 5, 2009 at 07:00 PM. Reason: Incorrect
Safety Car
Joined: May 2006
Posts: 3,799
Likes: 1
From: Northern Virginia
St. Jude Donor '08
LS1/MN6 LS6/M12
1st Gear 2.66:1 2.97:1
2nd Gear 1.78:1 2.07:1
3rd Gear 1.30:1 1.43:1
4th Gear 1.00:1 1.00:1
5th Gear 0.74:1 0.84:1
6th Gear 0.50:1 0.56:1
Reverse 2.90:1 3.28:1
Both the FRC and Z06 have 3.42 rear-end gears.
IIRC to match the gearing in a Z06, you need to go with a 3.9 rear-end differential.
1st Gear 2.66:1 2.97:1
2nd Gear 1.78:1 2.07:1
3rd Gear 1.30:1 1.43:1
4th Gear 1.00:1 1.00:1
5th Gear 0.74:1 0.84:1
6th Gear 0.50:1 0.56:1
Reverse 2.90:1 3.28:1
Both the FRC and Z06 have 3.42 rear-end gears.
IIRC to match the gearing in a Z06, you need to go with a 3.9 rear-end differential.
Thread Starter
Instructor
Joined: Dec 2008
Posts: 163
Likes: 3
From: Sparta TN
Thanks guys for all the information. I guess i will go with a 4.10 gear. I assumed that since it was a z51 car it would have the same tranny ratios as a zo6. A local tuner told me if it wasn't a z06 he would suggest a 4.10 gear instead of a 3.90. Im hope the steeper gear will help the drivabilty for my car since it has a larger cam.(no idea of the specs???)
Banned Scam/Spammer
Joined: May 2007
Posts: 15,685
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From: Machineguns, because I don’t compromise
I had a big cam in my last LS1 and I'd suggest that you have the car professionally tuned. With a nice dyno tune (or even better -a street tune) you will have not only more power, but also much better drivabilty and fuel economy. 
Melting Slicks
Joined: Dec 2004
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