Gears 3:90-4:10
Thread Starter
Burning Brakes
Joined: May 2004
Posts: 929
Likes: 45
From: Wayne NJ
Gears 3:90-4:10
Have 3:42 now with 6 speed trans.Considering gear change.Looking for extra punch at a roll. About what rpm would i be at going 60 in top gear with 390s and 410s. Gear swap is about 1400 bucks installes
Racer
Joined: Dec 2006
Posts: 366
Likes: 0
From: 500HP FRC feels really good... NY
I went to 390's and 6th gear, roughly 70 MPH is now ~1850RPM - that's about 200 to 250 more than before. Not a huge difference and unsure about 410's. Big seat of the pants difference though, enjoy either one 
Race Director
Joined: Jun 2004
Posts: 19,459
Likes: 48
From: Schaumburg IL
CI 7-8-9-11 Veteran
St. Jude Donor '06-'10, '13
even at 80MPH, I am just at about 2100 RPM with my 390's. Love them.Most people on here are going to tell you to go with the 410's but do what you think is best for you. I rode in a C5 with 410's and the pull was great (not that much more than 390's though) but I did not like turning that much higher RPM. The 390's are perfect for my driving style and mods I have.
Burning Brakes
Joined: Nov 2006
Posts: 963
Likes: 1
Le Mans Master
Joined: Aug 2004
Posts: 9,420
Likes: 8
From: Southern New Jersey, The wet part at the bottom
St. Jude Donor '08-'09-'10
4.10s here and love 'em. 1700 RPMs at 65 MPH in 6th gear. fuel mileage is up to (on flat road with the cruise set) 31.8 on the DIC. Performance Mods= Honker, Cat Back, and Tune. Headers, Cats, and X pipe in the near future.
Drifting
Joined: Apr 2006
Posts: 1,267
Likes: 0
From: O'Fallon Missouri
Go to West Coast Corvette site and do a search for their gear / rpm graph. When I changed my rear end out I used this graph, as it gives you both auto and manual conversions all the way up to 170 mph I believe.
Melting Slicks
Joined: Nov 2007
Posts: 2,336
Likes: 4
From: NW Arkansas
St. Jude Donor '08-'09
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Michael S. Palmer
Team Owner
Joined: Sep 2001
Posts: 23,283
Likes: 906
From: Lake Elsinore, CA
Here's a series of charts I generated to show RPM vs. speed of the various diff ratios when mated to the MN6 tranny.
http://redshift.homestead.com/files/...eed_Tables.xls
http://redshift.homestead.com/files/...eed_Tables.xls
Le Mans Master
Joined: Jan 2002
Posts: 7,275
Likes: 19
From: Camden County NJ
Take into consideration of how often you will be at top speed of your Vette for the gear ratio to even matter. That being said, there is nothing like a set of 4.10's I was on the fence also but took the wise advice of many and did the 4.10's, it was the right decision. Note: I had the 4.10's before I did the SC, the car was H/C then
I was on the fence also but took the wise advice of many and did the 4.10's, it was the right decision. Note: I had the 4.10's before I did the SC, the car was H/C then