4:10 rear gearset question
Thread Starter
Racer
Joined: Oct 2006
Posts: 424
Likes: 1
From: WA
4:10 rear gearset question
Hey, if I put the 4:10 rear dif gears in place of the Z51 set, what would my RPM's be at 60 MPH? I know they will be higher but I'm no math genius.
Would this really screw up my 32 MPG I'm getting now on the freeway?
Would this make my first gear too low and unusable?
Would this really screw up my 32 MPG I'm getting now on the freeway?
Would this make my first gear too low and unusable?
Team Owner
Joined: Mar 2005
Posts: 20,933
Likes: 905
From: salem OR
mph with the standard 6 speed.
Thread Starter
Racer
Joined: Oct 2006
Posts: 424
Likes: 1
From: WA
I can see this being a problem with the lower ratio'd transmission of my Z51 set up. A car I had back in the early 70's had 410's and it was real quick around town.
For a mod, I figured it would be a good one for the Vette
For a mod, I figured it would be a good one for the Vette
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Melting Slicks
Joined: Nov 2006
Posts: 2,865
Likes: 2
From: Dallas Tx
not sure...i know what 75mph was b/c i checked it before and after the install...i can see what 85mph is and let ya know unless someone else can say it before i do...i would assume 2,500 or so
Instructor
Joined: Jul 2008
Posts: 138
Likes: 1
From: San Diego CA
2500 in 6th at 85 would be a lot better than stock which would probably be under 1K!!
Le Mans Master
Joined: Dec 2005
Posts: 6,999
Likes: 1,685
From: Southeast TX
The math is not that tough. Divide the indicated speed at a particular RPM by 4.10. Multiply the results by 3.42. That will be your actual speed at that particular RPM with the new rear.
Melting Slicks
Joined: Sep 2007
Posts: 2,597
Likes: 3
From: READING PA
St. Jude Donor '08-'09-'10
all that performance. at 68 mph I was at 1500 rpm and that went to 1750 after 4.10. Standard corvette not z51.
Safety Car
Joined: Dec 2005
Posts: 4,157
Likes: 37
From: North Carolina
St. Jude Donor '07-'08-'09-'11-'12
Here's a calculator, just plug in the numbers and it will calculate anything you want to see.
Gear Calc
Here's my car, base tranny and 4.10s on the highway
Gear Calc
Here's my car, base tranny and 4.10s on the highway
Last edited by Craigster05; Aug 4, 2008 at 10:14 AM.
Melting Slicks
Joined: Sep 2007
Posts: 2,597
Likes: 3
From: READING PA
St. Jude Donor '08-'09-'10
Here's a calculator, just plug in the numbers and it will calculate anything you want to see.
Gear Calc
Here's my car, base tranny and 4.10s on the highway
Gear Calc
Here's my car, base tranny and 4.10s on the highway
Melting Slicks
Joined: Sep 2007
Posts: 2,597
Likes: 3
From: READING PA
St. Jude Donor '08-'09-'10
Safety Car
Joined: Feb 2008
Posts: 3,712
Likes: 3
From: TEXOMA
St. Jude Donor '08-'09
ill be going with 3.90's w/ my z51 for the sake of ever getting into the 10's and not having to shift into 5th or revving the **** outta the motor.
to sample your future mileage, drive down the highway, set cruise in 6th, then note mpg, then shift into 5th re-engauge cruise, and it will be about 1-2 mpg lower.
to sample your future mileage, drive down the highway, set cruise in 6th, then note mpg, then shift into 5th re-engauge cruise, and it will be about 1-2 mpg lower.
