do you run 4.10 gears?
Burning Brakes
Joined: Jun 2010
Posts: 812
Likes: 2
From: Metairie Louisiana
mcm, The higher the numerical diff ratio the quicker the car revs but you actually cover less ground, (you are gaining engine speed and losing wheel speed). The car will be more responsive with the mechanical advantage provided by the gearing but be preparred to shift more. No free lunch, if you want a little more kick while retaining your cars versatility I wouldn't go past 3.90. I have a 2001 C5 6spd, all stock and I find that the unmodified engine's torque friendly powerband works pretty well with the 3:42 diff. I could see me putting a 3:73 in, but nothing so aggressive that it would wind the motor past its torque peak too quickly. If I wanted it set-up mostly for the strip then it would have a 4:10 or more 
Last edited by had2have-it; May 31, 2011 at 12:08 AM.
Thread Starter
Le Mans Master
Joined: Nov 2009
Posts: 6,882
Likes: 234
From: Bangkok, Thailand
Now that all my mods are done (except I'm still thinking about a set of high-ratio rockers), I'm thinking that I'll skip the gear swap in favor of eventually getting an M12.
Melting Slicks
Joined: Jan 2004
Posts: 3,012
Likes: 15
From: Jensen Beach FL
Folks,
I haven't read all the post but, I have DTE 4.10 rear diff. It was under $2k and easy to install at home in my garage. However, I believe on the street it is a bit steep. When on the gas (I have a built LS3) I shift into second within, like 12 feet of launching the car from first.....this is on street tires though......
I haven't read all the post but, I have DTE 4.10 rear diff. It was under $2k and easy to install at home in my garage. However, I believe on the street it is a bit steep. When on the gas (I have a built LS3) I shift into second within, like 12 feet of launching the car from first.....this is on street tires though......
Last edited by craig04c5; May 31, 2011 at 12:05 PM.
Racer
Joined: Oct 2010
Posts: 419
Likes: 3
From: Lexington VA
St. Jude Donor '11
I have the 3:15 rear from the factory. If I put the car in 3rd, not OD (auto) and run it exactly at 75 mph my tach reads exactly 3150 rpms.
If I had the 4:10 gears the tach would be reading 4100 rpms at the same 75 mph. Good way to find out what gears are in a car.
I'm probably the only one on forum that didn't know this!
Safety Car
Joined: Mar 2005
Posts: 3,639
Likes: 8
From: Madison Wisconsin
St. Jude Donor '08
Any of you guys running any HPDE events? I'd like to know if the gears helped on a road curse like pulling harder out of the corners. I've been considering doing this too but also considering putting an LS7 in my 2000 FRC so gears and an LS7 might not play nice together.
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Melting Slicks
Joined: Jan 2004
Posts: 3,012
Likes: 15
From: Jensen Beach FL
Any of you guys running any HPDE events? I'd like to know if the gears helped on a road curse like pulling harder out of the corners. I've been considering doing this too but also considering putting an LS7 in my 2000 FRC so gears and an LS7 might not play nice together.
Melting Slicks
Joined: Jan 2004
Posts: 3,012
Likes: 15
From: Jensen Beach FL
Yes, 500 miles with no sudden take offs and not over 3000 RPM or over 50 mph. The aftermarket gears are generally stronger but it seems to be the casing that is the weak point so if the car will be used for racing a Diff brace would be a good idea.
Melting Slicks
Joined: Nov 2002
Posts: 2,884
Likes: 260
From: Jamison Pa
St. Jude Donor '11-'25
4:10's
I've got a '00 FRC. Currently I'm running a 402 (487RWHP/445RWTQ) w/LS3 heads, MN6 trans and 4:10 gears and the normal bolt ons. I love it.
I also had the 4:10's when I was running a H/C 347. The 3:42's didn't allow me to use 5&6 unless I was on the highway.
Now I'm waiting for a ERL 454 and plan on trying a 3:73/MN12 setup or 3:42/MN6. I might even pop the 4:10 in just to see what they are like.
I think the 4:10's make the MN6 cars more driveable around town.
Bob K.
I also had the 4:10's when I was running a H/C 347. The 3:42's didn't allow me to use 5&6 unless I was on the highway.
Now I'm waiting for a ERL 454 and plan on trying a 3:73/MN12 setup or 3:42/MN6. I might even pop the 4:10 in just to see what they are like.
I think the 4:10's make the MN6 cars more driveable around town.
Bob K.
Drifting
Joined: Jun 2006
Posts: 1,702
Likes: 254
From: Woodinville, WA
I have a bult/tuned (bolt ons) car with 4:10, and frankly 1st gear is useless. Half the time I launch from 2nd unless Im at a dead stop.
Hard call between 3:90 and 4:10...but I sure do love em.
Hard call between 3:90 and 4:10...but I sure do love em.
Instructor
Joined: Dec 2010
Posts: 136
Likes: 0
I bought the 4.10 ring and pinion set from RPM and they have been sitting in my closet for 2 months. After i bought them i am having mixed feelings regarding possible complications with the gear change. Possible whinning or leaky oil or any other problem. I am sure that the 4.10s will make my car faster but dont want any headaches. My local shop can change the ring and pinion i would do the proper break in.
ANy input? should i sell them? any bad experiences with the gears?
ANy input? should i sell them? any bad experiences with the gears?
Instructor
Joined: Feb 2003
Posts: 150
Likes: 0
From: Staten Island NY
My 03 Z06 is stone stock. I rarely use 6th gear and I feel that a rear gear change would give me the best bang for my buck. What gear ratio would best suit my needs?
AMP Racing
Joined: Aug 2006
Posts: 10,756
Likes: 589
From: Washington TWP NJ
2023 C5 of the Year Finalist - Modified
2017 C5 of Year Finalist
St. Jude Donor '09-'10-'11-'12
Melting Slicks
Joined: Jan 2004
Posts: 3,012
Likes: 15
From: Jensen Beach FL